[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

US20210225560A1 - Superconducting wire and superconducting coil - Google Patents

Superconducting wire and superconducting coil Download PDF

Info

Publication number
US20210225560A1
US20210225560A1 US17/069,479 US202017069479A US2021225560A1 US 20210225560 A1 US20210225560 A1 US 20210225560A1 US 202017069479 A US202017069479 A US 202017069479A US 2021225560 A1 US2021225560 A1 US 2021225560A1
Authority
US
United States
Prior art keywords
ppm
mass
superconducting
less
wire
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US17/069,479
Inventor
Kosei FUKUOKA
Yuki Ito
Kazunari Maki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Materials Corp
Original Assignee
Mitsubishi Materials Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Materials Corp filed Critical Mitsubishi Materials Corp
Priority to US17/069,479 priority Critical patent/US20210225560A1/en
Publication of US20210225560A1 publication Critical patent/US20210225560A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/005—Continuous casting of metals, i.e. casting in indefinite lengths of wire
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
    • H01B12/02—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by their form
    • H01B12/04—Single wire
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/12—Accessories for subsequent treating or working cast stock in situ
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C9/00—Alloys based on copper
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
    • H01B12/02—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by their form
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F6/00—Superconducting magnets; Superconducting coils
    • H01F6/06—Coils, e.g. winding, insulating, terminating or casing arrangements therefor
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N—ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10N60/00—Superconducting devices
    • H10N60/01—Manufacture or treatment
    • H10N60/0128—Manufacture or treatment of composite superconductor filaments
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
    • H01B12/02—Superconductive or hyperconductive conductors, cables, or transmission lines characterised by their form
    • H01B12/06—Films or wires on bases or cores
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment

Definitions

  • the present invention relates to a superconducting wire provided with a wire formed of a superconducting material and a superconducting stabilization material disposed in contact with the wire, and a superconducting coil formed of the superconducting wire.
  • the superconducting wire described above is used in fields such as MRI, NMR, particle accelerators, maglev, and electric power storage apparatuses.
  • This superconducting wire has a multi-core structure in which a plurality of wires formed of a superconducting material such as Nb—Ti alloy and Nb 3 Sn are bundled with a superconducting stabilization material interposed therebetween.
  • a tape-shaped superconducting wire in which a superconducting material and a superconducting stabilization material are laminated is also provided.
  • the superconducting wire has a structure in which a superconducting stabilization material having a relatively low resistance such as copper is disposed so as to be in contact with the superconducting material and, in a case where the superconducting state is partially destroyed, the electric current flowing through the superconducting material is temporarily diverted to the superconducting stabilization material and in the meantime the superconducting material is cooled to return to the superconducting state.
  • a superconducting stabilization material having a relatively low resistance such as copper
  • Residual resistance ratio is widely used as an indicator of electric resistance at extremely low temperatures.
  • the residual resistance ratio (RRR) is the ratio ⁇ 293K / ⁇ 4.2K of the resistance ⁇ 293K at normal temperature (293 K) to the resistance ⁇ 4.2K at liquid helium temperature (4.2 K), and the higher the residual resistance ratio (RRR), the better the performance as a superconducting stabilization material.
  • Japanese Unexamined Patent Application, First Publication No. 2011-236484 and Japanese Unexamined Patent Application, First Publication No. H05-025565 propose a Cu material having a high residual resistance ratio (RRR).
  • Japanese Unexamined Patent Application, First Publication No. 2011-236484 proposes a high purity copper having an extremely low impurity concentration in which the amounts of specific elements (Fe, P, Al, As, Sn, and S) are defined.
  • Japanese Unexamined Patent Application, First Publication No. H05-025565 proposes a Cu alloy in which small amount of Zr is added to high purity copper having a low oxygen concentration.
  • RRR residual resistance ratio
  • the present invention has been made in view of the above circumstances, and has an objective of providing a superconducting wire, which is able to be stably used and which is provided with a superconducting stabilization material which is able to be manufactured with a relatively simple and inexpensive manufacturing process and has a sufficiently high residual resistance ratio (RRR), as well as a superconducting coil formed of this superconducting wire.
  • RRR residual resistance ratio
  • a superconducting wire including: a wire formed of a superconducting material; and a superconducting stabilization material disposed in contact with the wire, in which the superconducting stabilization material is formed of a copper material which contains: one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements in a total of 3 ppm by mass to 400 ppm by mass; and the balance being Cu and inevitable impurities, and in which the total concentration of the inevitable impurities excluding O, H, C, N, and S which are gas components is 5 ppm by mass to 100 ppm by mass.
  • the rare earth (RE) elements are La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sc, and Y.
  • the superconducting stabilization material is formed of a copper material in which one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements are contained in a total of 3 ppm by mass to 400 ppm by mass in copper where a total concentration of inevitable impurities excluding O, H, C, N, and S which are gas components is 5 ppm by mass to 100 ppm by mass. Therefore, S, Se, and Te in copper are fixed as a compound and it is possible to improve the residual resistance ratio (RRR) of the superconducting stabilization material.
  • RRR residual resistance ratio
  • the superconducting stabilization material is preferably formed of the copper material with the inevitable impurities in which an Fe content is 10 ppm by mass or less, a Ni content is 10 ppm by mass or less, an As content is 5 ppm by mass or less, a Ag content is 50 ppm by mass or less, a Sn content is 4 ppm by mass or less, an Sb content is 4 ppm by mass or less, a Pb content is 6 ppm by mass or less, a Bi content is 2 ppm by mass or less, and a P content is 3 ppm by mass or less.
  • the superconducting stabilization material is preferably formed of the copper material in which a ratio Y/X of a total amount of additive elements of one or more types selected from Ca, Sr, Ba, and rare earth elements (Y ppm by mass) to a total amount of S, Se, and Te (X ppm by mass) is in a range of 0.5 ⁇ Y/X ⁇ 100.
  • the superconducting stabilization material is preferably formed of the copper material in which a compound which contains one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements and one or more types of elements selected from S, Se, and Te is present.
  • S, Se, and Te present in copper are effectively fixed as a compound with one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements, and it is possible to effectively suppress decreases in the residual resistance ratio (RRR) caused by S, Se, and Te.
  • RRR residual resistance ratio
  • the superconducting stabilization material preferably has a residual resistance ratio (RRR) of 250 or more.
  • RRR residual resistance ratio
  • the superconducting stabilization material is preferably manufactured by a continuous casting rolling method.
  • a superconducting coil according to a second aspect of the present invention has a winding wire part formed by winding the superconducting wire according to the first aspect around an outer surface of a winding frame.
  • a superconducting wire which is able to be stably used and which is provided with a superconducting stabilization material, which is able to be manufactured with a relatively simple and inexpensive manufacturing process and has a sufficiently high residual resistance ratio (RRR), and to provide a superconducting coil formed of this superconducting wire.
  • RRR residual resistance ratio
  • FIG. 1 is a cross-sectional schematic diagram of a superconducting wire according to the present embodiment.
  • FIG. 2 is a longitudinal sectional schematic diagram of a filament used for the superconducting wire shown in FIG. 1 .
  • FIG. 3 is a schematic diagram of a superconducting wire according to another embodiment.
  • FIG. 4 is diagrams showing (a) SEM observation result and (b) analysis result of the compound of the superconducting stabilization material of Invention Example 4 in the Examples.
  • FIG. 5 is diagrams showing (a) SEM observation result and (b) analysis result of the compound of the superconducting stabilization material of Invention Example 10 in the Examples.
  • FIG. 6 is diagrams showing (a) SEM observation result and (b) analysis result of the compound of the superconducting stabilization material of Invention Example 19 in the Examples.
  • the superconducting wire 10 in the present embodiment is provided with a core portion 11 , a plurality of filaments 12 disposed on the outer peripheral side of the core portion 11 , and an outer shell portion 13 disposed on the outer peripheral side of the plurality of filaments 12 .
  • the filaments 12 described above have a structure in which a wire 15 formed of a superconducting material is surrounded by a superconducting stabilization material 20 in a state of being electrically in contact therewith.
  • the wire 15 formed of a superconducting material and the superconducting stabilization material 20 are in a state in which it is possible to conduct electricity.
  • the superconducting stabilization material 20 is formed of a copper material which contains one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements in a total of 3 ppm by mass to 400 ppm by mass, the balance being Cu and inevitable impurities, and a total concentration of the inevitable impurities excluding O, H, C, N, and S which are gas components being 5 ppm by mass to 100 ppm by mass.
  • additive elements selected from Ca, Sr, Ba, and rare earth elements in a total of 3 ppm by mass to 400 ppm by mass, the balance being Cu and inevitable impurities, and a total concentration of the inevitable impurities excluding O, H, C, N, and S which are gas components being 5 ppm by mass to 100 ppm by mass.
  • the copper material forming the superconducting stabilization material 20 contains inevitable impurities in which an Fe content is 10 ppm by mass or less, a Ni content is 10 ppm by mass or less, an As content is 5 ppm by mass or less, an Ag content is 50 ppm by mass or less, an Sn content is 4 ppm by mass or less, an Sb content is 4 ppm by mass or less, a Pb content is 6 ppm by mass or less, a Bi content is 2 ppm by mass or less, and a P content is 3 ppm by mass or less.
  • a ratio Y/X of a total amount of additive elements of one or more types selected from Ca, Sr, Ba, and rare earth elements (Y ppm by mass) to a total amount of S, Se, and Te (X ppm by mass) is in a range of 0.5 ⁇ Y/X ⁇ 100.
  • the copper material forming the superconducting stabilization material 20 includes a compound which contains: one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements; and one or more types of elements selected from S, Se, and Te.
  • the superconducting stabilization material 20 has a residual resistance ratio (RRR) of 250 or more.
  • one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements are elements which are highly reactive with S, Se, and Te, by creating a compound with S, Se, and Te it is possible to suppress S, Se, and Te from forming a solid solution in copper. Due to this, it is possible to sufficiently improve the residual resistance ratio (RRR) of the superconducting stabilization material 20 .
  • RRR residual resistance ratio
  • one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements are elements which do not easily form a solid solution in copper and which have a small effect of decreasing the residual resistance ratio (RRR) even in a case of forming a solid solution in copper, the residual resistance ratio (RRR) of the superconducting stabilization material 20 does not decrease greatly even in a case where these additive elements are excessively added with respect to the amount of the S, Se, and Te.
  • the amount of one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements is less than 3 ppm by mass, there is a concern that it will not be possible to sufficiently fix S, Se, and Te.
  • the amount of one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements exceeds 400 ppm by mass, there is a concern that coarse precipitates or the like of these additive elements will form, which deteriorates the workability.
  • the amount of one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements is defined within the range of 3 ppm by mass to 400 ppm by mass.
  • the amount of one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements is preferably 3.5 ppm by mass or more, and more preferably 4.0 ppm by mass or more.
  • the amount of one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements is preferably 300 ppm by mass or less, and more preferably 100 ppm by mass or less.
  • the concentrations of inevitable impurities excluding gas components (O, H, C, N, and S) are set within the range of 5 ppm by mass to 100 ppm by mass in total.
  • the concentration of inevitable impurities excluding the gas components (O, H, C, N, and S) within a range of 5 ppm by mass to 100 ppm by mass in total, it is possible to use high purity copper with a purity of 99 to 99.9999 mass % or oxygen free copper (C10100 and C10200) as a raw material.
  • the O concentration is preferably 20 ppm by mass or less, and more preferably 10 ppm by mass or less.
  • the O concentration is even more preferably 5 ppm by mass or less.
  • the inevitable impurities is preferably 7 ppm by mass or more, and more preferably 10 ppm by mass or more.
  • the inevitable impurities is preferably 90 ppm by mass or less, and more preferably 80 ppm by mass or less.
  • inevitable impurities in the present embodiment are Fe, Ni, As, Ag, Sn, Sb, Pb, Bi, P, Li, Be, B, F, Na, Mg, Al, Si, Cl, K, Ti, V, Cr, Mn, Nb, Co, Zn, Ga, Ge, Br, Rb, Zr, Mo, Ru, Pd, Cd, In, I, Cs, Hf, Ta, W, Re, Os, Ir, Pt, Au, Hg, Tl, Th, and U.
  • the Fe content is defined as 10 ppm by mass or less, the Ni content as 10 ppm by mass or less, the As content as 5 ppm by mass or less, the Ag content as 50 ppm by mass or less, the Sn content as 4 ppm by mass or less, the Sb content as 4 ppm by mass or less, the Pb content as 6 ppm by mass or less, the Bi content as 2 ppm by mass or less, and the P content as 3 ppm by mass or less.
  • the Fe content as 4.5 ppm by mass or less, the Ni content as 3 ppm by mass or less, the As content as 3 ppm by mass or less, the Ag content as 38 ppm by mass or less, the Sn content as 3 ppm by mass or less, the Sb content as 1.5 ppm by mass or less, the Pb content as 4.5 ppm by mass or less, the Bi content as 1.5 ppm by mass or less, and the P content as 1.5 ppm by mass or less, and more preferably the Fe content as 3.3 ppm by mass or less, the Ni content as 2.2 ppm by mass or less, the As content as 2.2 ppm by mass or less, the Ag content as 28 ppm by mass or less, the Sn content as 2.2 ppm by mass or less, the Sb content as 1.1 ppm by mass or less, the Pb content as 3.3
  • the lower limit of the amount of Fe, Ni, As, Ag, Sn, Sb, Pb, Bi, and P is 0 ppm by mass.
  • one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements form compounds with elements such as S, Se, and Te.
  • the ratio Y/X of the total amount of additive elements (Y ppm by mass) to the total amount of S, Se, and Te (X ppm by mass) is less than 0.5, the amount of additive elements is insufficient, and there is a concern that it may not be possible to sufficiently fix the elements such as S, Se, and Te.
  • the ratio Y/X of the total amount of additive elements to the total amount of S, Se, and Te is defined within the range of 0.5 to 100.
  • the ratio Y/X of the total amount of additive elements to the total amount of S, Se, and Te is preferably 0.75 or more, and more preferably 1.0 or more.
  • the ratio Y/X of the total amount of additive elements to the total amount of S, Se, and Te is preferably 75 or less, and more preferably 50 or less.
  • the total amount of S, Se, and Te in the superconducting stabilization material 20 is preferably more than 0 ppm by mass and 25 ppm by mass or less, without being limited thereto.
  • one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements form compounds with elements such as S, Se, and Te so as to suppress elements such as S, Se, and Te from forming solid solutions in the copper.
  • compounds containing one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements and one or more types of elements selected from S, Se, and Te are present, and thereby it is possible to effectively improve the residual resistance ratio (RRR) of the superconducting stabilization material 20 .
  • RRR residual resistance ratio
  • the number density of the compounds when compounds containing one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements and elements such as S, Se, and Te are present in a number density of 0.001/ ⁇ m 2 or more, it is possible to effectively improve the residual resistance ratio (RRR).
  • RRR residual resistance ratio
  • the number density is more preferably 0.007/ ⁇ m 2 or more.
  • the number density described above relates to a compound having a particle diameter of 0.1 ⁇ m or more.
  • the number density of the compound described above is 0.1/ ⁇ m 2 or less, and more preferably 0.09/ ⁇ m 2 or less.
  • the n number density is even more preferably 0.08/ ⁇ m 2 or less.
  • the residual resistance ratio (RRR) of the superconducting stabilization material 20 is 250 or more, the resistance value is low at extremely low temperatures and it is possible to effectively divert the electric current.
  • the residual resistance ratio (RRR) is preferably 280 or more, and more preferably 300 or more.
  • the residual resistance ratio (RRR) is even more preferably 400 or more.
  • the superconducting stabilization material 20 described above is manufactured by a manufacturing process including a melting casting process, a plastic working process, and a heat treatment process.
  • a copper wire rod having the composition shown in the present embodiment may be manufactured by a continuous casting rolling method (for example, Southwire Continuous Rod (SCR) system) or the like, and the superconducting stabilization material 20 may be manufactured using this rod as a base material.
  • SCR Southwire Continuous Rod
  • the continuous casting rolling method referred to here is a process in which a copper wire rod is manufactured using a continuous casting rolling facility provided with a belt-wheel type continuous casting apparatus and a continuous rolling device, and a drawn copper wire is manufactured using this copper wire rod as a material.
  • the superconducting wire 10 of the present embodiment formed as described above includes: the wire 15 formed of a superconducting material; and the superconducting stabilization material 20 disposed in contact with the wire 15 , and the superconducting stabilization material 20 is formed of a copper material in which one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements are contained in a total of 3 ppm by mass to 400 ppm by mass in copper where the total concentration of inevitable impurities excluding O, H, C, N, and S which are gas components is 5 ppm by mass to 100 ppm by mass.
  • S, Se, and Te in copper are fixed as a compound and it is possible to improve the residual resistance ratio (RRR) of the superconducting stabilization material 20 .
  • RRR residual resistance ratio
  • the superconducting stabilization material being electrically in contact with the wire formed of the superconducting material, even in a case where the normal conducting area A in which the superconducting state is destroyed is generated in the wire 15 formed of the superconducting material, it is possible to effectively divert the electric current to the superconducting stabilization material 20 . Therefore, it is possible to suppress the transition of the entire superconducting wire 10 to the normal conducting state, and it is possible to stably use the superconducting wire 10 according to the present embodiment.
  • the amounts of Fe, Ni, As, Ag, Sn, Sb, Pb, Bi, and P which influence the residual resistance ratio (RRR) are defined such that the Fe content is 10 ppm by mass or less, the Ni content is 10 ppm by mass or less, the As content is 5 ppm by mass or less, the Ag content is 50 ppm by mass or less, the Sn content is 4 ppm by mass or less, the Sb content is 4 ppm by mass or less, the Pb content is 6 ppm by mass or less, the Bi content is 2 ppm by mass or less, and the P content is 3 ppm by mass or less, it is possible to effectively improve the residual resistance ratio (RRR) of the superconducting stabilization material 20 .
  • RRR residual resistance ratio
  • a ratio Y/X of a total amount of additive elements of one or more types selected from Ca, Sr, Ba, and rare earth elements (Y ppm by mass) to a total amount of S, Se, and Te (X ppm by mass) is within the range of 0.5 ⁇ Y/X ⁇ 100, it is possible to effectively fix S, Se, and Te in copper as a compound with additive elements, and it is possible to effectively suppress decreases in the residual resistance ratio (RRR).
  • RRR residual resistance ratio
  • the S, Se, and Te present in copper are effectively fixed by a compound with one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements, and it is possible to effective suppress decreases in the residual resistance ratio (RRR) of the superconducting stabilization material 20 caused by S, Se, and Te.
  • RRR residual resistance ratio
  • the number density of the compounds having a particle diameter of 0.1 ⁇ m or more is 0.001/ ⁇ m 2 or more, it is possible to effectively fix S, Se, and Te as a compound, and to sufficiently improve the residual resistance ratio (RRR) of the superconducting stabilization material 20 .
  • the residual resistance ratio (RRR) of the superconducting stabilization material 20 is relatively high at 250 or more, the resistance value at extremely low temperatures is sufficiently low. Therefore, even in a case when the superconducting state is destroyed and a normal conducting area A is generated in the wire 15 formed of the superconducting material, it is possible to effectively divert the electric current to the superconducting stabilization material 20 .
  • the present invention is not limited thereto but is able to be appropriately modified in a range not departing from the technical idea of the invention.
  • the core portion 11 and the outer shell portion 13 forming the superconducting wire 10 may also be formed of a copper material having the same composition as that of the superconducting stabilization material 20 of the present embodiment.
  • the superconducting wire 10 having a structure in which the plurality of filaments 12 are bundled is described as an example, but the present invention is not limited thereto, for example, as shown in FIG. 3 , the superconducting wire may be a superconducting wire 110 having a structure in which a superconducting material 115 and a superconducting stabilization material 120 are laminated and disposed on a tape-like substrate 113 .
  • component analysis was carried out as follows. For elements excluding gas components, glow discharge mass spectrometry was used in a case of being less than 10 ppm by mass and an inductively coupled plasma atomic emission spectrometry was used in a case of being 10 ppm or more. In addition, an infrared absorption method was used for analysis of S. The measured O concentrations were all 10 ppm by mass or less. Here, for the analysis of O, the infrared absorption method was used.
  • the particle diameter of the compound was the average length along the major axis of the compound (the maximum length of a straight line which could be drawn in the particle on the condition of not coming into contact with the particle boundary while being drawn) and the minor axis (the maximum length of a straight line which could be drawn in the direction orthogonal to the major axis on the condition of not coming into contact with the particle boundary while being drawn). Then, the number density (number/ ⁇ m 2 ) of the compounds having a particle diameter of 0.1 ⁇ m or more was determined.
  • FIG. 4 shows (a) SEM observation results and (b) analysis results (EDX analysis results) of the compound of Invention Example 4
  • FIG. 5 shows (a) SEM observation results of the compound and (b) analysis results (EDX analysis results) of Invention Example 10
  • FIG. 6 shows (a) SEM observation results and (b) analysis results (EDX analysis results) of the compound of Invention Example 19.
  • FIG. 4( b ) , FIG. 5( b ) , and FIG. 6( b ) show the spectra of the compounds marked with “+” in each of FIG. 4( a ) , FIG. 5( a ) , and FIG. 6( b ) .
  • Comparative Example 1 the total amount of inevitable impurities excluding the gas components (O, H, C, N, and S) exceeded 100 ppm by mass and the residual resistance ratio (RRR) was relatively low at 106.
  • Example 1 to 22 the residual resistance ratio (RRR) was 250 or more, and it was confirmed that Example 1 to 22 is particularly suitable as a superconducting stabilization material.
  • a superconducting wire which is able to be stably used and which is provided with a superconducting stabilization material, which is able to be manufactured with a relatively simple and inexpensive manufacturing process and has a sufficiently high residual resistance ratio (RRR).

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Power Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Manufacturing & Machinery (AREA)
  • Superconductors And Manufacturing Methods Therefor (AREA)
  • Continuous Casting (AREA)

Abstract

The present invention is a superconducting wire including: a wire formed of a superconducting material; and a superconducting stabilization material disposed in contact with the wire, in which the superconducting stabilization material is formed of a copper material which contains: one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements in a total of 3 ppm by mass to 400 ppm by mass; a balance being Cu and inevitable impurities, and in which a total concentration of the inevitable impurities excluding O, H, C, N, and S which are gas components is 5 ppm by mass to 100 ppm by mass.

Description

    CROSS-REFERENCE TO RELATED PATENT APPLICATIONS
  • This application is a Continuation of the U.S. patent application Ser. No. 15/540,928 filed Jun. 29, 2017, which is a U.S. National Phase Application under 35 U.S.C. § 371 of International Patent Application No. PCT/JP2015/085765 filed on Dec. 22, 2015 and claims the benefit of Japanese Patent Application No. 2015-001510, filed Jan. 7, 2015, all of which are incorporated herein by reference in their entirety. The International Application was published in Japanese on Jul. 14, 2016 as International Publication No. WO/2016/111159 under PCT Article 21(2).
    • FIELD OF THE INVENTION
  • The present invention relates to a superconducting wire provided with a wire formed of a superconducting material and a superconducting stabilization material disposed in contact with the wire, and a superconducting coil formed of the superconducting wire.
    • BACKGROUND OF THE INVENTION
  • The superconducting wire described above is used in fields such as MRI, NMR, particle accelerators, maglev, and electric power storage apparatuses.
  • This superconducting wire has a multi-core structure in which a plurality of wires formed of a superconducting material such as Nb—Ti alloy and Nb3Sn are bundled with a superconducting stabilization material interposed therebetween. In addition, a tape-shaped superconducting wire in which a superconducting material and a superconducting stabilization material are laminated is also provided.
  • Here, in the superconducting wire described above, in a case where the superconducting state is destroyed in a part of the superconducting material, there is a concern that the resistance partially increases greatly, in which the temperature of the superconducting material rises and the temperature of the entire superconducting material becomes higher than the critical temperature, transitioning the superconducting state to a normal conducting state. Therefore, the superconducting wire has a structure in which a superconducting stabilization material having a relatively low resistance such as copper is disposed so as to be in contact with the superconducting material and, in a case where the superconducting state is partially destroyed, the electric current flowing through the superconducting material is temporarily diverted to the superconducting stabilization material and in the meantime the superconducting material is cooled to return to the superconducting state.
  • In the superconducting stabilization material described above, in order to effectively divert the electric current, it is required that the resistance at extremely low temperatures be sufficiently low. Residual resistance ratio (RRR) is widely used as an indicator of electric resistance at extremely low temperatures. The residual resistance ratio (RRR) is the ratio ρ293K/ρ4.2K of the resistance ρ293K at normal temperature (293 K) to the resistance ρ4.2K at liquid helium temperature (4.2 K), and the higher the residual resistance ratio (RRR), the better the performance as a superconducting stabilization material.
  • Therefore, for example, Japanese Unexamined Patent Application, First Publication No. 2011-236484 and Japanese Unexamined Patent Application, First Publication No. H05-025565 propose a Cu material having a high residual resistance ratio (RRR).
  • Japanese Unexamined Patent Application, First Publication No. 2011-236484 proposes a high purity copper having an extremely low impurity concentration in which the amounts of specific elements (Fe, P, Al, As, Sn, and S) are defined.
  • In addition, Japanese Unexamined Patent Application, First Publication No. H05-025565 proposes a Cu alloy in which small amount of Zr is added to high purity copper having a low oxygen concentration.
    • Technical Problem
  • It is known that the residual resistance ratio (RRR) is sufficiently high in an ultrahigh purity copper where the concentrations of the impurity elements are reduced to an extreme level. However, in order to purify copper to such high degree of purity, there are problems in that the manufacturing process becomes extremely complicated, and the manufacturing cost greatly increases.
  • Here, in Japanese Unexamined Patent Application, First Publication No. 2011-236484, the amounts of specific elements (Fe, P, Al, As, Sn, and S) are limited to less than 0.1 ppm; however, it is not easy to reduce these elements to less than 0.1 ppm, and there is also the problem in that the manufacturing process becomes complicated.
  • In addition, although the amounts of oxygen and Zr is defined in Japanese Unexamined Patent Application, First Publication No. H05-025565, there are problems in that it is difficult to control the amounts of oxygen and Zr and it is difficult to stably produce a copper alloy having a high residual resistance ratio (RRR).
  • The present invention has been made in view of the above circumstances, and has an objective of providing a superconducting wire, which is able to be stably used and which is provided with a superconducting stabilization material which is able to be manufactured with a relatively simple and inexpensive manufacturing process and has a sufficiently high residual resistance ratio (RRR), as well as a superconducting coil formed of this superconducting wire.
    • SUMMARY OF THE INVENTION Solution to Problem
  • In order to solve this problem, as a result of extensive research conducted by the present inventors, it was confirmed that among the inevitable impurities, S, Se, and Te in particular exert a negative influence on the residual resistance ratio (RRR), and it was found that it is possible to manufacture a superconducting stabilization material having a high residual resistance ratio (RRR) by adding small amounts of Ca, Sr, Ba, and rare earth (RE) elements to pure copper and fixing S, Se, and Te as a compound.
  • Based on the above findings, according to a first aspect of the present invention, there is provided a superconducting wire including: a wire formed of a superconducting material; and a superconducting stabilization material disposed in contact with the wire, in which the superconducting stabilization material is formed of a copper material which contains: one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements in a total of 3 ppm by mass to 400 ppm by mass; and the balance being Cu and inevitable impurities, and in which the total concentration of the inevitable impurities excluding O, H, C, N, and S which are gas components is 5 ppm by mass to 100 ppm by mass.
  • Here, in the present invention, the rare earth (RE) elements are La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sc, and Y.
  • According to the superconducting wire having the configuration described above, the superconducting stabilization material is formed of a copper material in which one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements are contained in a total of 3 ppm by mass to 400 ppm by mass in copper where a total concentration of inevitable impurities excluding O, H, C, N, and S which are gas components is 5 ppm by mass to 100 ppm by mass. Therefore, S, Se, and Te in copper are fixed as a compound and it is possible to improve the residual resistance ratio (RRR) of the superconducting stabilization material. In addition, even in a case where the superconducting state is destroyed in a part of the superconducting material, due to the superconducting stabilization material being electrically in contact with the wire formed of a superconducting material, it is possible to divert the electric current flowing in the superconducting material to the superconducting stabilization material and to suppress the transition of the entire superconducting wire to the normal conducting state. Therefore, it is possible to stably use the superconducting wire.
  • In addition, in the superconducting stabilization material, since copper with the total concentration of inevitable impurities excluding O, H, C, N, and S which are gas components being 5 ppm by mass to 100 ppm by mass is used, there is no need to excessively increase the purity level of the copper, thus the manufacturing process is simplified and it is possible to reduce the manufacturing cost.
  • Here, in the superconducting wire according to the first aspect of the present invention, the superconducting stabilization material is preferably formed of the copper material with the inevitable impurities in which an Fe content is 10 ppm by mass or less, a Ni content is 10 ppm by mass or less, an As content is 5 ppm by mass or less, a Ag content is 50 ppm by mass or less, a Sn content is 4 ppm by mass or less, an Sb content is 4 ppm by mass or less, a Pb content is 6 ppm by mass or less, a Bi content is 2 ppm by mass or less, and a P content is 3 ppm by mass or less.
  • Among inevitable impurities, specific elements such as Fe, Ni, As, Ag, Sn, Sb, Pb, Bi, and P have an effect of decreasing the residual resistance ratio (RRR). Therefore, defining the amount of these elements as described above makes it possible to effectively improve the residual resistance ratio (RRR) of the superconducting stabilization material.
  • In addition, in the superconducting wire according to the first aspect of the present invention, the superconducting stabilization material is preferably formed of the copper material in which a ratio Y/X of a total amount of additive elements of one or more types selected from Ca, Sr, Ba, and rare earth elements (Y ppm by mass) to a total amount of S, Se, and Te (X ppm by mass) is in a range of 0.5≤Y/X≤100.
  • In this case, since a ratio Y/X of a total amount of additive elements of one or more types selected from Ca, Sr, Ba, and rare earth elements (Y ppm by mass) to a total amount of S, Se, and Te (X ppm by mass) is in the range described above, it is possible for S, Se, and Te in copper to be effectively fixed as a compound with one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements, and to effectively suppress decreases in the residual resistance ratio (RRR) caused by S, Se, and Te.
  • Furthermore, in the superconducting wire according to the first aspect of the present invention, the superconducting stabilization material is preferably formed of the copper material in which a compound which contains one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements and one or more types of elements selected from S, Se, and Te is present.
  • In this case, S, Se, and Te present in copper are effectively fixed as a compound with one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements, and it is possible to effectively suppress decreases in the residual resistance ratio (RRR) caused by S, Se, and Te.
  • In addition, in the superconducting wire according to the first aspect of the present invention, the superconducting stabilization material preferably has a residual resistance ratio (RRR) of 250 or more.
  • In this case, since the residual resistance ratio (RRR) of the superconducting stabilization material is relatively high at 250 or more, meaning the resistance at extremely low temperatures is sufficiently low, it is possible to sufficiently divert the electric current when the superconducting state of the superconducting material is destroyed, and it is possible to suppress the normal conducting state from propagating to the entire superconducting material.
  • Furthermore, in the superconducting wire according to the first aspect of the present invention, the superconducting stabilization material is preferably manufactured by a continuous casting rolling method.
  • In this case, since casting and rolling are carried out continuously, it is possible to obtain a long superconducting stabilization material with high production efficiency.
  • A superconducting coil according to a second aspect of the present invention has a winding wire part formed by winding the superconducting wire according to the first aspect around an outer surface of a winding frame.
  • In the superconducting coil with this configuration, since the superconducting wire provided with a superconducting stabilization material having a high residual resistance ratio (RRR) is used as described above, it is possible to stably use the superconducting coil.
    • Advantageous Effects of Invention
  • According to the present invention, it is possible to provide a superconducting wire which is able to be stably used and which is provided with a superconducting stabilization material, which is able to be manufactured with a relatively simple and inexpensive manufacturing process and has a sufficiently high residual resistance ratio (RRR), and to provide a superconducting coil formed of this superconducting wire.
    • BRIEF DESCRIPTION OF THE DRAWINGS
  • FIG. 1 is a cross-sectional schematic diagram of a superconducting wire according to the present embodiment.
  • FIG. 2 is a longitudinal sectional schematic diagram of a filament used for the superconducting wire shown in FIG. 1.
  • FIG. 3 is a schematic diagram of a superconducting wire according to another embodiment.
  • FIG. 4 is diagrams showing (a) SEM observation result and (b) analysis result of the compound of the superconducting stabilization material of Invention Example 4 in the Examples.
  • FIG. 5 is diagrams showing (a) SEM observation result and (b) analysis result of the compound of the superconducting stabilization material of Invention Example 10 in the Examples.
  • FIG. 6 is diagrams showing (a) SEM observation result and (b) analysis result of the compound of the superconducting stabilization material of Invention Example 19 in the Examples.
    •  DETAILED DESCRIPTION OF THE INVENTION
  • Description will be given below of a superconducting wire 10 according to one embodiment of the present invention with reference to the accompanying drawings.
  • As shown in FIG. 1, the superconducting wire 10 in the present embodiment is provided with a core portion 11, a plurality of filaments 12 disposed on the outer peripheral side of the core portion 11, and an outer shell portion 13 disposed on the outer peripheral side of the plurality of filaments 12.
  • In the present embodiment, as shown in FIG. 1 and FIG. 2, the filaments 12 described above have a structure in which a wire 15 formed of a superconducting material is surrounded by a superconducting stabilization material 20 in a state of being electrically in contact therewith. In other words, the wire 15 formed of a superconducting material and the superconducting stabilization material 20 are in a state in which it is possible to conduct electricity.
  • Here, as shown in FIG. 2, in the superconducting stabilization material 20, in a case where the superconducting state is destroyed in part of the wire 15 formed of a superconducting material, a normal conducting area A is generated and an electric current I flowing through the wire 15 formed of a superconducting material is temporarily diverted.
  • Then, in the present embodiment, the superconducting stabilization material 20 is formed of a copper material which contains one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements in a total of 3 ppm by mass to 400 ppm by mass, the balance being Cu and inevitable impurities, and a total concentration of the inevitable impurities excluding O, H, C, N, and S which are gas components being 5 ppm by mass to 100 ppm by mass.
  • In addition, in the present embodiment, the copper material forming the superconducting stabilization material 20 contains inevitable impurities in which an Fe content is 10 ppm by mass or less, a Ni content is 10 ppm by mass or less, an As content is 5 ppm by mass or less, an Ag content is 50 ppm by mass or less, an Sn content is 4 ppm by mass or less, an Sb content is 4 ppm by mass or less, a Pb content is 6 ppm by mass or less, a Bi content is 2 ppm by mass or less, and a P content is 3 ppm by mass or less.
  • Furthermore, in the superconducting stabilization material 20 of the present embodiment, a ratio Y/X of a total amount of additive elements of one or more types selected from Ca, Sr, Ba, and rare earth elements (Y ppm by mass) to a total amount of S, Se, and Te (X ppm by mass) is in a range of 0.5≤Y/X≤100.
  • In addition, in the present embodiment, the copper material forming the superconducting stabilization material 20 includes a compound which contains: one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements; and one or more types of elements selected from S, Se, and Te.
  • Furthermore, in the present embodiment, the superconducting stabilization material 20 has a residual resistance ratio (RRR) of 250 or more.
  • Here, description will be given below of the reasons for defining the component composition of the superconducting stabilization material 20, the presence or absence of compounds, and the residual resistance ratio (RRR) as described above.
  • (One or More Types of Additive Elements Selected from Ca, Sr, Ba, and Rare Earth Elements)
  • Among the inevitable impurities contained in the copper, S, Se, and Te are elements which form solid solutions in copper, greatly decreasing the residual resistance ratio (RRR). Therefore, in order to improve the residual resistance ratio (RRR), it is necessary to eliminate the influence of S, Se, and Te.
  • Here, since one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements are elements which are highly reactive with S, Se, and Te, by creating a compound with S, Se, and Te it is possible to suppress S, Se, and Te from forming a solid solution in copper. Due to this, it is possible to sufficiently improve the residual resistance ratio (RRR) of the superconducting stabilization material 20.
  • Here, since one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements are elements which do not easily form a solid solution in copper and which have a small effect of decreasing the residual resistance ratio (RRR) even in a case of forming a solid solution in copper, the residual resistance ratio (RRR) of the superconducting stabilization material 20 does not decrease greatly even in a case where these additive elements are excessively added with respect to the amount of the S, Se, and Te.
  • Here, in a case where the amount of one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements is less than 3 ppm by mass, there is a concern that it will not be possible to sufficiently fix S, Se, and Te. On the other hand, in a case where the amount of one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements exceeds 400 ppm by mass, there is a concern that coarse precipitates or the like of these additive elements will form, which deteriorates the workability. From the above description, in the present embodiment, the amount of one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements is defined within the range of 3 ppm by mass to 400 ppm by mass.
  • Here, in order to effectively fix S, Se, and Te, the amount of one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements is preferably 3.5 ppm by mass or more, and more preferably 4.0 ppm by mass or more. On the other hand, in order to effectively suppress decrease in workability, the amount of one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements is preferably 300 ppm by mass or less, and more preferably 100 ppm by mass or less.
    • (Inevitable Impurity Elements Excluding Gas Components)
  • Lowering the concentrations of inevitable impurities excluding gas components (O, H, C, N, and S) improves the residual resistance ratio (RRR). On the other hand, in a case where there is an attempt to reduce the concentration of inevitable impurities more than necessary, the manufacturing process becomes complicated whereby the manufacturing cost drastically increases. Therefore, in the present embodiment, the concentrations of inevitable impurities excluding gas components (O, H, C, N, and S) are set within the range of 5 ppm by mass to 100 ppm by mass in total.
  • In order to set the concentration of inevitable impurities excluding the gas components (O, H, C, N, and S) within a range of 5 ppm by mass to 100 ppm by mass in total, it is possible to use high purity copper with a purity of 99 to 99.9999 mass % or oxygen free copper (C10100 and C10200) as a raw material. However, since Ca, Sr, Ba, and rare earth elements react with O in a case there is a high 0 concentration, the O concentration is preferably 20 ppm by mass or less, and more preferably 10 ppm by mass or less. The O concentration is even more preferably 5 ppm by mass or less.
  • Here, in order to effectively suppress the increase in the manufacturing cost of the superconducting stabilization material 20, the inevitable impurities is preferably 7 ppm by mass or more, and more preferably 10 ppm by mass or more. On the other hand, in order to effectively improve the residual resistance ratio (RRR) of the superconducting stabilization material 20, the inevitable impurities is preferably 90 ppm by mass or less, and more preferably 80 ppm by mass or less.
  • Here, inevitable impurities in the present embodiment are Fe, Ni, As, Ag, Sn, Sb, Pb, Bi, P, Li, Be, B, F, Na, Mg, Al, Si, Cl, K, Ti, V, Cr, Mn, Nb, Co, Zn, Ga, Ge, Br, Rb, Zr, Mo, Ru, Pd, Cd, In, I, Cs, Hf, Ta, W, Re, Os, Ir, Pt, Au, Hg, Tl, Th, and U.
    • (Fe, Ni, As, Ag, Sn, Sb, Pb, Bi, and P)
  • Since specific elements such as Fe, Ni, As, Ag, Sn, Sb, Pb, Bi, and P among the inevitable impurities have an effect of decreasing the residual resistance ratio (RRR) of the superconducting stabilization material 20, defining the amount of each of these elements makes it possible to effectively suppress decreases in the residual resistance ratio (RRR) of the superconducting stabilization material 20. Therefore, in the present embodiment, the Fe content is defined as 10 ppm by mass or less, the Ni content as 10 ppm by mass or less, the As content as 5 ppm by mass or less, the Ag content as 50 ppm by mass or less, the Sn content as 4 ppm by mass or less, the Sb content as 4 ppm by mass or less, the Pb content as 6 ppm by mass or less, the Bi content as 2 ppm by mass or less, and the P content as 3 ppm by mass or less.
  • In order to more effectively suppress decreases in the residual resistance ratio (RRR) of the superconducting stabilization material 20, it is preferable to define the Fe content as 4.5 ppm by mass or less, the Ni content as 3 ppm by mass or less, the As content as 3 ppm by mass or less, the Ag content as 38 ppm by mass or less, the Sn content as 3 ppm by mass or less, the Sb content as 1.5 ppm by mass or less, the Pb content as 4.5 ppm by mass or less, the Bi content as 1.5 ppm by mass or less, and the P content as 1.5 ppm by mass or less, and more preferably the Fe content as 3.3 ppm by mass or less, the Ni content as 2.2 ppm by mass or less, the As content as 2.2 ppm by mass or less, the Ag content as 28 ppm by mass or less, the Sn content as 2.2 ppm by mass or less, the Sb content as 1.1 ppm by mass or less, the Pb content as 3.3 ppm by mass or less, the Bi content as 1.1 ppm by mass or less, and the P content as 1.1 ppm by mass or less. The lower limit of the amount of Fe, Ni, As, Ag, Sn, Sb, Pb, Bi, and P is 0 ppm by mass. In addition, since there is a concern that excessive reduction of the above may result in an increase in the manufacturing cost, it is preferable to set the Fe content as 0.1 ppm by mass or more, the Ni content as 0.1 ppm by mass or more, the As content as 0.1 ppm by mass or more, the Ag content as 0.1 ppm by mass or more, the Sn content as 0.1 ppm by mass or more, the Sb content as 0.1 ppm by mass or more, the Pb content as 0.1 ppm by mass or more, the Bi content as 0.1 ppm by mass or more, and the P content as 0.1 ppm by mass or more, without being limited thereto.
    • (Ratio Y/X of Total Amount of Additive Elements to Total Amount of S, Se, and Te)
  • As described above, one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements form compounds with elements such as S, Se, and Te. Here, in a case where the ratio Y/X of the total amount of additive elements (Y ppm by mass) to the total amount of S, Se, and Te (X ppm by mass) is less than 0.5, the amount of additive elements is insufficient, and there is a concern that it may not be possible to sufficiently fix the elements such as S, Se, and Te.
  • On the other hand, in a case where the ratio Y/X of the total amount of additive elements to the total amount of S, Se, and Te exceeds 100, there may be an excess of additive elements not reacting with S, Se and Te, and this causes a concern that the workability may be deteriorated.
  • From the above, in the present embodiment, the ratio Y/X of the total amount of additive elements to the total amount of S, Se, and Te is defined within the range of 0.5 to 100.
  • Here, in order to effectively fix the elements such as S, Se, and Te as a compound, the ratio Y/X of the total amount of additive elements to the total amount of S, Se, and Te is preferably 0.75 or more, and more preferably 1.0 or more. In addition, in order to effectively suppress decreases in workability, the ratio Y/X of the total amount of additive elements to the total amount of S, Se, and Te is preferably 75 or less, and more preferably 50 or less. Here, the total amount of S, Se, and Te in the superconducting stabilization material 20 is preferably more than 0 ppm by mass and 25 ppm by mass or less, without being limited thereto.
  • (Compound Containing Additional Element and One or More Types of Elements Selected from S, Se, and Te)
  • As described above, one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements form compounds with elements such as S, Se, and Te so as to suppress elements such as S, Se, and Te from forming solid solutions in the copper. Thus, compounds containing one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements and one or more types of elements selected from S, Se, and Te are present, and thereby it is possible to effectively improve the residual resistance ratio (RRR) of the superconducting stabilization material 20.
  • Here, when compounds containing one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements and elements such as S, Se, and Te are present in a number density of 0.001/μm2 or more, it is possible to effectively improve the residual resistance ratio (RRR). In addition, in order to further improve the residual resistance ratio (RRR), it is preferable to set the number density of the compounds to 0.005/μm2 or more. The number density is more preferably 0.007/μm2 or more. In the present embodiment, the number density described above relates to a compound having a particle diameter of 0.1 μm or more.
  • In the present embodiment, since the amount of elements such as S, Se, and Te is sufficiently small, the number density of the compound described above (particle diameter of 0.1 μm or more) is 0.1/μm2 or less, and more preferably 0.09/μm2 or less. The n number density is even more preferably 0.08/μm2 or less.
    • (Residual Resistance Ratio (RRR))
  • Since the residual resistance ratio (RRR) of the superconducting stabilization material 20 according to the present embodiment is 250 or more, the resistance value is low at extremely low temperatures and it is possible to effectively divert the electric current. The residual resistance ratio (RRR) is preferably 280 or more, and more preferably 300 or more. The residual resistance ratio (RRR) is even more preferably 400 or more. Here, it is preferable to set the residual resistance ratio (RRR) to 10000 or less, without being limited thereto.
  • Here, the superconducting stabilization material 20 described above is manufactured by a manufacturing process including a melting casting process, a plastic working process, and a heat treatment process.
  • A copper wire rod having the composition shown in the present embodiment may be manufactured by a continuous casting rolling method (for example, Southwire Continuous Rod (SCR) system) or the like, and the superconducting stabilization material 20 may be manufactured using this rod as a base material. In this case, the production efficiency of the superconducting stabilization material 20 is improved, and it is possible to greatly reduce the manufacturing cost. The continuous casting rolling method referred to here is a process in which a copper wire rod is manufactured using a continuous casting rolling facility provided with a belt-wheel type continuous casting apparatus and a continuous rolling device, and a drawn copper wire is manufactured using this copper wire rod as a material.
  • The superconducting wire 10 of the present embodiment formed as described above includes: the wire 15 formed of a superconducting material; and the superconducting stabilization material 20 disposed in contact with the wire 15, and the superconducting stabilization material 20 is formed of a copper material in which one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements are contained in a total of 3 ppm by mass to 400 ppm by mass in copper where the total concentration of inevitable impurities excluding O, H, C, N, and S which are gas components is 5 ppm by mass to 100 ppm by mass. Thus, S, Se, and Te in copper are fixed as a compound and it is possible to improve the residual resistance ratio (RRR) of the superconducting stabilization material 20. In addition, by the superconducting stabilization material being electrically in contact with the wire formed of the superconducting material, even in a case where the normal conducting area A in which the superconducting state is destroyed is generated in the wire 15 formed of the superconducting material, it is possible to effectively divert the electric current to the superconducting stabilization material 20. Therefore, it is possible to suppress the transition of the entire superconducting wire 10 to the normal conducting state, and it is possible to stably use the superconducting wire 10 according to the present embodiment.
  • In addition, since copper where the total concentration of inevitable impurities excluding O, H, C, N, and S which are gas components is 5 ppm by mass to 100 ppm by mass is used, there is no need to excessively increase the purity level of the copper, the manufacturing process is simplified, and it is possible to reduce the manufacturing cost of the superconducting stabilization material 20.
  • Further, in the present embodiment, since the amounts of Fe, Ni, As, Ag, Sn, Sb, Pb, Bi, and P which influence the residual resistance ratio (RRR) are defined such that the Fe content is 10 ppm by mass or less, the Ni content is 10 ppm by mass or less, the As content is 5 ppm by mass or less, the Ag content is 50 ppm by mass or less, the Sn content is 4 ppm by mass or less, the Sb content is 4 ppm by mass or less, the Pb content is 6 ppm by mass or less, the Bi content is 2 ppm by mass or less, and the P content is 3 ppm by mass or less, it is possible to effectively improve the residual resistance ratio (RRR) of the superconducting stabilization material 20.
  • In addition, in the present embodiment, since a ratio Y/X of a total amount of additive elements of one or more types selected from Ca, Sr, Ba, and rare earth elements (Y ppm by mass) to a total amount of S, Se, and Te (X ppm by mass) is within the range of 0.5≤Y/X≤100, it is possible to effectively fix S, Se, and Te in copper as a compound with additive elements, and it is possible to effectively suppress decreases in the residual resistance ratio (RRR). In addition, without large amounts of excess additive elements which do not react with S, Se and Te, it is possible to ensure the workability of the superconducting stabilization material 20.
  • Furthermore, in the present embodiment, since there is a compound which contains one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements and one or more types of elements selected from S, Se, and Te, the S, Se, and Te present in copper are effectively fixed by a compound with one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements, and it is possible to effective suppress decreases in the residual resistance ratio (RRR) of the superconducting stabilization material 20 caused by S, Se, and Te.
  • In particular, in the present embodiment, since the number density of the compounds having a particle diameter of 0.1 μm or more is 0.001/μm2 or more, it is possible to effectively fix S, Se, and Te as a compound, and to sufficiently improve the residual resistance ratio (RRR) of the superconducting stabilization material 20.
  • In addition, in the present embodiment, since the residual resistance ratio (RRR) of the superconducting stabilization material 20 is relatively high at 250 or more, the resistance value at extremely low temperatures is sufficiently low. Therefore, even in a case when the superconducting state is destroyed and a normal conducting area A is generated in the wire 15 formed of the superconducting material, it is possible to effectively divert the electric current to the superconducting stabilization material 20.
  • Although the superconducting wire according to the embodiment of the present invention was described above, the present invention is not limited thereto but is able to be appropriately modified in a range not departing from the technical idea of the invention.
  • For example, the core portion 11 and the outer shell portion 13 forming the superconducting wire 10 may also be formed of a copper material having the same composition as that of the superconducting stabilization material 20 of the present embodiment.
  • In addition, in the embodiment described above, as shown in FIG. 1, the superconducting wire 10 having a structure in which the plurality of filaments 12 are bundled is described as an example, but the present invention is not limited thereto, for example, as shown in FIG. 3, the superconducting wire may be a superconducting wire 110 having a structure in which a superconducting material 115 and a superconducting stabilization material 120 are laminated and disposed on a tape-like substrate 113.
    • Example
  • Description will be given below of the results of confirmatory experiments conducted to confirm the effect of the present invention.
  • In the examples, as a laboratory experiment, high purity copper having a purity of 99.9999 mass % and a master alloy of Ca, Sr, Ba, and rare earth (RE) elements were used as raw materials, and adjustments were carried out to obtain the compositions shown in Table 1. In addition, for Fe, Ni, As, Ag, Sn, Sb, Pb, Bi, P, and other impurities, a master alloy of each element was prepared from Fe, Ni, As, Ag, Sn, Sb, Pb, Bi, and P having a purity of 99.9 mass % or more and pure copper having a purity of 99.9 mass % and adjustments were carried out using the master alloys. First, high purity copper was melted using an electric furnace in a reducing atmosphere of N2+CO and master alloys of various additive elements and impurities were added thereto thereby adjusting the concentrations thereof to be a predetermined concentration, and then the resultant was casted into a predetermined mold. Thereby, an ingot with a diameter of 70 mm and a length of 150 mm was obtained. Mischmetal was used as part of the raw material for a rare earth master alloy. Square material having cross-sectional size of 25 mm×25 mm was cut out from this ingot and subjected to hot rolling at 850° C. to obtain a hot rolled wire having a diameter of 8 mm, and a thin wire with a diameter of 2.0 mm was formed from this hot-rolled wire by cold rolling, and subjected to strain relief annealing of being maintained at 500° C. for 1 hour to produce the evaluation wire shown in Table 1. Here, in this example, the mixing in of impurity elements was also observed in the process of melting and casting.
  • Using these evaluation wires, the following items were evaluated.
    • (Residual Resistance Ratio (RRR))
  • Using the four terminal method, the electrical specific resistance (ρ293 K) at 293 K and the electrical specific resistance (ρ4.2 K) at the temperature of liquid helium (4.2 K) was measured and RRR=ρ293K/ρ4.2 K was calculated.
    • (Composition Analysis)
  • Using the sample from which the residual resistance ratio (RRR) was measured, component analysis was carried out as follows. For elements excluding gas components, glow discharge mass spectrometry was used in a case of being less than 10 ppm by mass and an inductively coupled plasma atomic emission spectrometry was used in a case of being 10 ppm or more. In addition, an infrared absorption method was used for analysis of S. The measured O concentrations were all 10 ppm by mass or less. Here, for the analysis of O, the infrared absorption method was used.
    • (Observation of Compound Particles)
  • In order to confirm the presence or absence of compound particles containing one or more types of additive elements selected from Ca, Sr, Ba, and rare earth elements and one or more types of S, Se, and Te, particle observation was performed using a scanning electron microscope (SEM), and energy dispersive X-ray spectrometry (EDX).
  • In addition, in order to evaluate the number density (number/μm2) of the compounds, an area where the dispersion state of the compounds is not unique was observed at 10000 times magnification (observation field: 2×108 nm2), and 10 observation fields (total observation field: 2×109 nm2) were analyzed. The particle diameter of the compound was the average length along the major axis of the compound (the maximum length of a straight line which could be drawn in the particle on the condition of not coming into contact with the particle boundary while being drawn) and the minor axis (the maximum length of a straight line which could be drawn in the direction orthogonal to the major axis on the condition of not coming into contact with the particle boundary while being drawn). Then, the number density (number/μm2) of the compounds having a particle diameter of 0.1 μm or more was determined.
  • The evaluation results are shown in Table 1. In addition, FIG. 4 shows (a) SEM observation results and (b) analysis results (EDX analysis results) of the compound of Invention Example 4, FIG. 5 shows (a) SEM observation results of the compound and (b) analysis results (EDX analysis results) of Invention Example 10, and FIG. 6 shows (a) SEM observation results and (b) analysis results (EDX analysis results) of the compound of Invention Example 19. Also, FIG. 4(b), FIG. 5(b), and FIG. 6(b) show the spectra of the compounds marked with “+” in each of FIG. 4(a), FIG. 5(a), and FIG. 6(b).
  • TABLE 1
    Total
    Additive Elements (ppm by mass) concentration Impurities (ppm by mass)
    Total of inevitable Total
    amount Y impurities amount
    of Ca, Sr, excluding O, X of S,
    Ca Sr Ba RE Ba, and RE H, C, N, and S S Se Te Se, and Te
    Invention 1  3 — — — 3 13.3 5.5 1.1 1.2 7.8
    Example 2  4 — — — 4 32.8 5.0 0.6 0.4 6.0
    3 12 — — — 12 15.6 4.2 1.0 0.8 6.0
    4 26 — — — 26 40.4 5.2 0.5 1.0 6.7
    5 53 — — — 53 28.0 5.8 0.6 1.0 7.4
    6 66 — — — 66 15.7 4.4 0.9 0.5 5.8
    7 95 — — — 95 75.7 5.1 0.9 0.6 6.6
    8 233  — — — 233 92.0 5.5 1.1 0.9 7.5
    9 384  — — — 384 66.1 5.6 0.9 0.7 7.2
    10 — 13 — — 13 46.0 4.3 0.8 1.1 6.2
    11 — 35 — — 35 25.3 7.5 0.7 0.6 8.8
    12 — 71 — — 71 20.0 5.4 0.8 0.2 6.4
    13 — 164  — — 164 32.0 7.2 1.3 0.9 9.4
    14 — — 11 — 11 33.9 4.5 0.6 0.8 5.9
    15 — — 54 — 54 20.1 5.2 1.1 0.5 6.8
    16 — — 102  — 102 87.5 4.6 0.9 0.9 6.4
    17 — — 135  — 135 46.0 7.7 1.2 1.0 9.9
    18 — — — Ce: 13 13 27.7 7.5 0.5 0.6 8.6
    19 — — — *3MM: 51 51 19.8 7.3 1.2 0.9 9.4
    20 — — — Nd: 89 89 50.2 3.7 1.2 1.1 6.0
    21 32 — — La: 32 32 5.5 0.9 0.2 0.2 1.3
    22 — 18 — — 18 5.7 0.4 0.1 0.1 0.5
    Comparative 1 15  5 — — 20 171.4 5.0 1.0 0.4 6.4
    Example 2 — — — — 0 48.2 4.6 0.8 0.9 6.3
    3 1030  — — — 1030 41.4 3.6 0.4 0.4 4.4
    Impurities (ppm by mass) *2
    Specific impurities *1 Number
    Fe Ni As Ag Sn Sb Pb Bi P Cu Y/X density RRR
    Invention 1 1.2 1.1 1.0 6 0.1 0.1 0.1 0.1 0.1 Balance 0.4 0.00188 365
    Example 2 6.8 2.8 1.2 13 0.8 1.2 1.2 0.4 1.4 Balance 0.7 0.00250 255
    3 0.6 1.0 0.5 9 0.1 0.3 0.8 0.2 0.1 Balance 2.0 0.00750 452
    4 2.3 2.4 1.2 21 1.1 0.5 4.8 0.8 1.5 Balance 3.9 0.01625 482
    5 1.5 2.8 0.8 13 1.8 1.0 1.8 0.7 0.8 Balance 7.2 0.01872 639
    6 0.6 1.0 0.5 9 0.1 0.3 0.7 0.2 0.1 Balance 11.4 0.01470 732
    7 7.0 5.7 3.4 39 2.6 3.2 3.3 1.3 1.8 Balance 14.4 0.01672 310
    8 9.9 8.7 4.3 42 3.9 3.2 4.9 1.9 2.8 Balance 31.1 0.01900 282
    9 3.0 1.8 0.6 48 0.4 1.2 1.2 1.0 1.2 Balance 53.4 0.01822 324
    10 2.5 2.8 1.5 28 1.1 1.2 1.8 0.7 0.7 Balance 2.1 0.00813 355
    11 0.6 6.6 0.5 12 0.1 0.3 0.7 0.9 0.1 Balance 4.0 0.02188 547
    12 1.1 1.0 1.4 10 0.1 0.2 1.4 0.9 1.1 Balance 11.1 0.01619 643
    13 1.9 2.6 2.3 15 0.5 0.8 1.6 1.7 0.9 Balance 17.5 0.02379 424
    14 2.4 2.0 1.3 20 0.3 0.8 1.6 0.4 1.0 Balance 1.9 0.00688 353
    15 0.6 1.0 4.8 9 0.1 0.3 0.8 0.2 0.1 Balance 8.0 0.01720 503
    16 8.7 6.8 3.9 44 2.9 3.2 4.4 1.5 2.3 Balance 15.9 0.01622 293
    17 2.6 1.3 2.1 25 1.3 3.9 1.9 0.8 1.1 Balance 13.7 0.02506 438
    18 4.1 0.9 1.8 13 1.3 0.4 1.5 1.0 0.5 Balance 1.5 0.00813 319
    19 0.7 0.8 0.4 9 3.3 0.3 0.9 0.3 0.2 Balance 5.4 0.02379 677
    20 6.0 1.1 0.6 31 0.4 0.7 1.0 0.3 2.6 Balance 14.9 0.01518 452
    21 0.6 0.2 0.1 3 0.2 0.2 0.4 0.1 0.4 Balance 25.4 0.00319 969
    22 2.1 0.1 0.2 2 0.2 0.1 0.1 0.1 0.2 Balance 33.4 0.00137 1181 
    Comparative 1 4.1 27.0 5.9 85 3.3 3.1 4.1 3.8 5.1 Balance 3.1 0.01250 106
    Example 2 2.1 2.5 2.5 30 0.5 0.9 1.3 0.7 2.0 Balance 0.0 0.00000 218
    3 2.6 0.9 1.8 25 0.8 0.7 1.8 0.7 2.9 Balance 234.6 — —
    *1 Y/X: Ratio of a total amount of additive elements (Y ppm by mass) to a total amount of S, Se, and Te (X ppm by mass)
    *2 Number density (number/μm2) of compounds with a particle diameter of 0.1 μm or more
    *3MM: Mischmetal
  • In Comparative Example 1, the total amount of inevitable impurities excluding the gas components (O, H, C, N, and S) exceeded 100 ppm by mass and the residual resistance ratio (RRR) was relatively low at 106.
  • In Comparative Example 2, one or more types of additive elements selected from Ca, Sr, Ba, and rare earth (RE) elements were not added, and the residual resistance ratio (RRR) was relatively low at 218.
  • In Comparative Example 3, the added amount of Ca exceeded the range of the present invention at 1030 ppm by mass, and breaking occurred during plastic working. For this reason, measurement of the residual resistance ratio (RRR) and observation of the particles were not performed.
  • In contrast, in Invention Examples 1 to 22, the residual resistance ratio (RRR) was 250 or more, and it was confirmed that Example 1 to 22 is particularly suitable as a superconducting stabilization material.
  • In addition, as shown in FIG. 4, in a case where Ca was added, a compound containing Ca and S was observed.
  • Furthermore, as shown in FIG. 5, in a case where Sr was added, a compound containing Sr and S was observed.
  • Furthermore, as shown in FIG. 6, in a case where rare earth elements were added, a compound of rare earth elements and S was observed.
  • From the above, it was confirmed that, according to the present invention, it was possible to provide a superconducting wire which was provided with a superconducting stabilization material which was able to be manufactured with a relatively simple and inexpensive manufacturing process and which had a sufficiently high residual resistance ratio (RRR).
    • INDUSTRIAL APPLICABILITY
  • According to the present invention, it is possible to provide a superconducting wire which is able to be stably used and which is provided with a superconducting stabilization material, which is able to be manufactured with a relatively simple and inexpensive manufacturing process and has a sufficiently high residual resistance ratio (RRR).
    • REFERENCE SIGNS LIST
    • 10, 110 SUPERCONDUCTING WIRE
    • 20, 120 SUPERCONDUCTING STABILIZATION MATERIAL

Claims (7)

1. A superconducting wire comprising:
a wire formed of a superconducting material; and
a superconducting stabilization material disposed in contact with the wire,
wherein the superconducting stabilization material is formed of a copper material which contains: one or more additive elements selected from rare earth elements in a total of 3 ppm by mass to 400 ppm by mass; and a balance being Cu and inevitable impurities, and in which a total concentration of the inevitable impurities excluding O, H, C, N, and S which are gas components is 5 ppm by mass to 100 ppm by mass.
2. The superconducting wire according to claim 1,
wherein the inevitable impurities comprise; Fe in a range of 10 ppm by mass or less, Ni in a range of 10 ppm by mass or less, As in a range of 5 ppm by mass or less, Ag in a range of 50 ppm by mass or less, Sn in a range of 4 ppm by mass or less, Sb in a range of 4 ppm by mass or less, Pb in a range of 6 ppm by mass or less, Bi in a range of 2 ppm by mass or less, and P in a range of 3 ppm by mass or less.
3. The superconducting wire according to claim 1,
wherein the superconducting stabilization material is formed of the copper material in which a ratio Y/X of the total amount of the one or more additive elements (Y ppm by mass) to a total amount of S, Se, and Te (X ppm by mass) is in a range of 0.5≤Y/X≤100.
4. The superconducting wire according to claim 1,
wherein the superconducting stabilization material is formed of the copper material in which a compound, which contains the one or more additive elements and one or more elements selected from S, Se, and Te, is present.
5. The superconducting wire according to claim 1,
wherein the superconducting stabilization material has a residual resistance ratio (RRR) of 250 or more.
6. The superconducting wire according to claim 1,
wherein the superconducting stabilization material is manufactured by a continuous casting rolling method.
7. A superconducting coil comprising:
a winding wire part formed by winding the superconducting wire according to claim 1 around an outer surface of a winding frame.
US17/069,479 2015-01-07 2020-10-13 Superconducting wire and superconducting coil Abandoned US20210225560A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US17/069,479 US20210225560A1 (en) 2015-01-07 2020-10-13 Superconducting wire and superconducting coil

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
JP2015001510A JP6056877B2 (en) 2015-01-07 2015-01-07 Superconducting wire and superconducting coil
JP2015-001510 2015-01-07
PCT/JP2015/085765 WO2016111159A1 (en) 2015-01-07 2015-12-22 Superconducting wire and superconducting coil
US201715540928A 2017-06-29 2017-06-29
US17/069,479 US20210225560A1 (en) 2015-01-07 2020-10-13 Superconducting wire and superconducting coil

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
US15/540,928 Continuation US10964454B2 (en) 2015-01-07 2015-12-22 Superconducting wire and superconducting coil
PCT/JP2015/085765 Continuation WO2016111159A1 (en) 2015-01-07 2015-12-22 Superconducting wire and superconducting coil

Publications (1)

Publication Number Publication Date
US20210225560A1 true US20210225560A1 (en) 2021-07-22

Family

ID=56355859

Family Applications (2)

Application Number Title Priority Date Filing Date
US15/540,928 Active 2037-07-26 US10964454B2 (en) 2015-01-07 2015-12-22 Superconducting wire and superconducting coil
US17/069,479 Abandoned US20210225560A1 (en) 2015-01-07 2020-10-13 Superconducting wire and superconducting coil

Family Applications Before (1)

Application Number Title Priority Date Filing Date
US15/540,928 Active 2037-07-26 US10964454B2 (en) 2015-01-07 2015-12-22 Superconducting wire and superconducting coil

Country Status (7)

Country Link
US (2) US10964454B2 (en)
EP (1) EP3243916B1 (en)
JP (1) JP6056877B2 (en)
KR (1) KR102450307B1 (en)
CN (2) CN107002179B (en)
TW (1) TWI596622B (en)
WO (1) WO2016111159A1 (en)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6056877B2 (en) 2015-01-07 2017-01-11 三菱マテリアル株式会社 Superconducting wire and superconducting coil
JP6056876B2 (en) * 2015-01-07 2017-01-11 三菱マテリアル株式会社 Superconducting stabilizer
JP6299803B2 (en) * 2016-04-06 2018-03-28 三菱マテリアル株式会社 Superconducting wire and superconducting coil
JP6299802B2 (en) 2016-04-06 2018-03-28 三菱マテリアル株式会社 Superconducting stabilizer, superconducting wire and superconducting coil
JP7039924B2 (en) 2017-10-20 2022-03-23 株式会社ノーリツ Thermal valve and hot water heating device
WO2019088080A1 (en) 2017-10-30 2019-05-09 三菱マテリアル株式会社 Superconductivity stabilizing material, superconducting wire, and superconducting coil
CN109961899B (en) * 2017-12-25 2020-12-01 西部超导材料科技股份有限公司 Online hot-drawing method Nb for preparing bronze3Method for Sn superconducting wire
EP3896179A4 (en) * 2018-12-13 2022-10-19 Mitsubishi Materials Corporation Pure copper plate
WO2020203071A1 (en) * 2019-03-29 2020-10-08 三菱マテリアル株式会社 Copper material and heat-dissipating member
CN112322924B (en) * 2020-10-16 2022-05-20 中南大学 Oxygen-free copper, preparation method and application
KR20240150040A (en) 2023-04-07 2024-10-15 고려대학교 산학협력단 Current lead

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4568567A (en) * 1984-10-09 1986-02-04 Rca Corporation Method of removing trace quantities of alkali metal impurities from a bialkali-antimonide photoemissive cathode
US5043025A (en) * 1990-06-12 1991-08-27 Iowa State University Research Foundation, Inc. High strength-high conductivity Cu--Fe composites produced by powder compaction/mechanical reduction

Family Cites Families (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5474698A (en) 1977-11-28 1979-06-14 Univ Tohoku Superconductive thin band and method of fabricating same
JPS6058291B2 (en) 1978-01-20 1985-12-19 住友電気工業株式会社 Copper alloy soft conductor and its manufacturing method
US4233067A (en) 1978-01-19 1980-11-11 Sumitomo Electric Industries, Ltd. Soft copper alloy conductors
JPS6062009A (en) 1983-09-14 1985-04-10 日立電線株式会社 Composite superconductor stabilized by ag-filled oxygenless copper
JPS63140052A (en) * 1986-12-01 1988-06-11 Hitachi Cable Ltd Oxygen-free copper-base dilute alloy having low-temperature softening characteristic and its use
JPS63235440A (en) 1987-03-23 1988-09-30 Furukawa Electric Co Ltd:The Fine copper wire and its production
JPH01143744A (en) * 1987-11-30 1989-06-06 Aichi Steel Works Ltd Production of oxide superconducting fine wire
JPH02145737A (en) * 1988-11-24 1990-06-05 Dowa Mining Co Ltd High strength and high conductivity copper-base alloy
JPH04224662A (en) * 1990-12-26 1992-08-13 Hitachi Cable Ltd Production of copper material having high residual resistance ratio
JP3047540B2 (en) 1991-07-23 2000-05-29 三菱マテリアル株式会社 High purity Cu alloy for superconducting stabilizer with high residual resistance ratio
CN1080779A (en) * 1993-05-05 1994-01-12 北京有色金属研究总院 The copper alloy that the very thin multi-core low-temp superconducting wire band is used
US20040266628A1 (en) * 2003-06-27 2004-12-30 Superpower, Inc. Novel superconducting articles, and methods for forming and using same
JP2005056754A (en) 2003-08-06 2005-03-03 Sumitomo Electric Ind Ltd Superconductive wire and its manufacturing method
US8192596B2 (en) 2004-01-29 2012-06-05 Jx Nippon Mining & Metals Corporation Ultrahigh-purity copper and process for producing the same
KR101006035B1 (en) * 2005-06-15 2011-01-06 제이엑스 닛코 닛세키 킨조쿠 가부시키가이샤 Ultrahigh-purity copper and process for producing the same, and bonding wire comprising ultrahigh-purity copper
CA2622384C (en) 2005-07-29 2014-09-23 American Superconductor Corporation High temperature superconducting wires and coils
WO2007136406A2 (en) 2005-11-08 2007-11-29 Supramagnetics, Inc. Composite conductors with improved structural and electrical properties
JP4538813B2 (en) 2006-05-29 2010-09-08 Ｄｏｗａホールディングス株式会社 Connector and charging socket using copper-based alloy material
JP5717236B2 (en) * 2010-05-12 2015-05-13 三菱マテリアル株式会社 Particle accelerator
JP5589753B2 (en) 2010-10-20 2014-09-17 日立金属株式会社 Welded member and manufacturing method thereof
TWI571518B (en) 2011-08-29 2017-02-21 Furukawa Electric Co Ltd Copper alloy material and manufacturing method thereof
SG190482A1 (en) * 2011-12-01 2013-06-28 Heraeus Materials Tech Gmbh Doped 4n copper wire for bonding in microelectronics device
DE102012205843A1 (en) 2012-04-11 2013-10-17 Bruker Eas Gmbh NbTi superconductor with reduced weight
JP6101491B2 (en) * 2012-11-30 2017-03-22 株式会社フジクラ Oxide superconducting wire and method for producing the same
JP5752736B2 (en) 2013-04-08 2015-07-22 三菱マテリアル株式会社 Sputtering target
CN103985479B (en) 2014-04-28 2018-03-30 赵遵成 Preparation method of high-temperature superconducting coated conductor strip
JP6056876B2 (en) * 2015-01-07 2017-01-11 三菱マテリアル株式会社 Superconducting stabilizer
JP6056877B2 (en) 2015-01-07 2017-01-11 三菱マテリアル株式会社 Superconducting wire and superconducting coil
JP6299803B2 (en) 2016-04-06 2018-03-28 三菱マテリアル株式会社 Superconducting wire and superconducting coil

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4568567A (en) * 1984-10-09 1986-02-04 Rca Corporation Method of removing trace quantities of alkali metal impurities from a bialkali-antimonide photoemissive cathode
US5043025A (en) * 1990-06-12 1991-08-27 Iowa State University Research Foundation, Inc. High strength-high conductivity Cu--Fe composites produced by powder compaction/mechanical reduction

Also Published As

Publication number Publication date
KR20170102224A (en) 2017-09-08
WO2016111159A1 (en) 2016-07-14
JP2016125115A (en) 2016-07-11
KR102450307B1 (en) 2022-09-30
CN107002179B (en) 2018-11-16
TWI596622B (en) 2017-08-21
JP6056877B2 (en) 2017-01-11
EP3243916A4 (en) 2018-05-30
EP3243916B1 (en) 2019-03-27
TW201643900A (en) 2016-12-16
CN108766661A (en) 2018-11-06
EP3243916A1 (en) 2017-11-15
CN107002179A (en) 2017-08-01
CN108766661B (en) 2020-09-25
US20180005731A1 (en) 2018-01-04
US10964454B2 (en) 2021-03-30

Similar Documents

Publication Publication Date Title
US20210225560A1 (en) Superconducting wire and superconducting coil
US10971278B2 (en) Superconducting wire and superconducting coil
US10964453B2 (en) Superconducting stabilization material, superconducting wire, and superconducting coil
EP3441485B1 (en) Stabilizer material for superconductor, superconducting wire and superconducting coil
JP2017188339A (en) Superconductive stabilization material, superconductive wire and superconductive coil
US11149329B2 (en) Stabilizer material for superconductor
JP6057008B2 (en) Superconducting wire and superconducting coil
JP2016156098A (en) Superconduction stabilization material, superconducting wire, and superconducting coil
TW201928073A (en) Superconductivity stabilizing material, superconducting wire, and superconducting coil

Legal Events

Date Code Title Description
STPP Information on status: patent application and granting procedure in general

Free format text: APPLICATION DISPATCHED FROM PREEXAM, NOT YET DOCKETED

STPP Information on status: patent application and granting procedure in general

Free format text: DOCKETED NEW CASE - READY FOR EXAMINATION

STPP Information on status: patent application and granting procedure in general

Free format text: NON FINAL ACTION MAILED

STPP Information on status: patent application and granting procedure in general

Free format text: RESPONSE TO NON-FINAL OFFICE ACTION ENTERED AND FORWARDED TO EXAMINER

STPP Information on status: patent application and granting procedure in general

Free format text: FINAL REJECTION MAILED

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION