CN110556213A - Preparation method of composite rod for improving superconducting composite linear performance of Nb 3 Sn - Google Patents
Preparation method of composite rod for improving superconducting composite linear performance of Nb 3 Sn Download PDFInfo
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- H01B12/00—Superconductive or hyperconductive conductors, cables, or transmission lines
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Abstract
The invention discloses a method for preparing a composite rod for improving Nb 3 Sn superconducting composite linear performance, which comprises the steps of wrapping a copper layer on an Nb rod to obtain a CuNb single core rod, bundling the CuNb single core rod, a pure Nb rod and a hexagonal oxygen-free copper rod according to hexagonal arrangement and loading the CuNb single core rod, the pure Nb rod, the CuNb single core rod and the hexagonal oxygen-free copper rod into an oxygen-free copper sheath in sequence from outside to inside to obtain a CuNb composite sheath, and then heating and extruding to obtain the composite rod.
Description
Technical Field
The invention belongs to the technical field of superconducting material processing methods, and particularly relates to a preparation method of a composite rod for improving the linear performance of a Nb 3 Sn superconducting composite.
Background
the high-performance Nb 3 Sn superconducting wire is an important material for manufacturing a large-scale particle accelerator, the J c of the high-critical-current-density Nb 3 Sn superconducting wire which is internationally delivered and used in batches in various scientific projects can reach more than 2500A/mm 2 under the conditions of 12T and 4.2K, and the stable high-critical-current-density Nb 3 Sn long-wire preparation technology and the mass production capacity are obtained, so that the high-performance Nb 3 Sn superconducting wire is one of important basic material problems to be solved for manufacturing the large-scale accelerator.
the conventional method is to pack a Nb rod into a copper sheath for welding, extruding and stretching to obtain a CuNb single core rod, and then obtain a CuNb composite rod with high Nb content through the processes of assembling, extruding, stretching and the like, but the conventional method cannot control the thickness of a Cu layer on the surface of the CuNb single core rod, so that the Nb content is difficult to increase, and when a subsequent Nb 3 Sn subgroup element blank is prepared together with a SnTi, SnCu alloy rod or a pure Sn rod, the Sn element is easy to diffuse into a Cu area of the CuNb composite rod, the utilization rate of the Sn element is reduced, the current carrying capacity of the Nb 3 Sn wire is influenced, the residual resistivity RRR value of the Nb 3 Sn superconducting wire is reduced, the RRR value is one of resistivity ratio of the superconducting wire at 273K and 20K, the yield is one of the superconducting wire at the same time, and the yield of the Nb 3 superconducting wire is difficult to control in the uniform heat treatment process of the Nb 3 Sn superconducting wire.
Disclosure of Invention
The invention aims to provide a preparation method of a composite rod for improving the performance of a Nb 3 Sn superconducting composite wire, which solves the problems that a CuNb composite rod prepared by the existing method has low Nb content ratio, leads to easy diffusion of Sn element, low utilization rate and low RRR value of residual resistivity, improves the current carrying capacity of a Nb3Sn superconducting wire, and also solves the problems of insufficient core wire reaction and low wire processing yield during heat treatment of the Nb 3 Sn superconducting wire.
The invention provides a preparation method of a composite rod for improving the performance of a Nb 3 Sn superconducting composite wire, which comprises the following steps:
step 1: cleaning the Nb rod, and wrapping the Nb rod with a copper layer to obtain a CuNb single core rod;
Step 2: packing the CuNb single core rod, the pure Nb rods and the hexagonal oxygen-free copper rods in the step 1 into an oxygen-free copper sheath in a hexagonal arrangement and bundling manner, wherein the process from outside to inside comprises the following steps: the method comprises the following steps that CuNb single core rods are distributed on the periphery of a hexagonal close-packed hexagonal oxygen-free copper rod central layer in a close-packed mode, the pure Nb rods are redistributed on the periphery of the CuNb single core rods and then are arranged in the oxygen-free copper sheath, vacuum electron beam sealing welding is adopted at two ends of the oxygen-free copper sheath to obtain a CuNb composite sheath, the pure Nb rods, the hexagonal oxygen-free copper rods and the CuNb single core rods in the step 2 are identical in size, and the identical size means the length of the pure Nb rods, the hexagonal oxygen-free copper rods and the CuNb single core rods, the cross section diameter or the opposite side length;
And step 3: and (3) insulating the CuNb composite sheath obtained in the step (2) at the temperature of 550-650 ℃ for 1-4 hours, and extruding to obtain the composite rod.
Preferably, the Nb rods in the step 1 are circular or hexagonal, the diameter of the circular Nb rods is 5-15 mm, and the length of opposite sides of the hexagonal Nb rods is 5-15 mm.
Preferably, the way of wrapping the Nb rod with the copper layer in step 1 is electroplating or winding through an oxygen-free copper foil.
More preferably, the thickness of the copper layer wound by the electroplating or oxygen-free copper foil is 10 to 300 μm, and the length is 300 to 800 mm.
preferably, the diameter phi of the oxygen-free copper sheath in the step 2 is 150-300 mm.
preferably, in the step 2, 1-3 layers of pure Nb rods are distributed.
the invention has the beneficial effects that:
The invention provides a preparation method of a composite rod for improving the performance of Nb 3 Sn superconducting composite wires, which is characterized in that pure Nb rods are arranged on the periphery of the composite rod, so that the diffusion of Sn element to a Cu region of a CuNb composite rod is effectively slowed down, the utilization rate of the Sn element is improved, the RRR value of the Nb 3 Sn superconducting wires is effectively improved, and the overall current carrying capacity of the Nb3Sn superconducting wires is finally improved.
drawings
FIG. 1 is a schematic cross-sectional view of a composite rod made from selected round Nb rods in accordance with the present invention;
FIG. 2 is a schematic cross-sectional view of a composite rod made from hexagonal Nb rods according to the present invention;
FIG. 3 is a schematic cross-sectional view of a hexagonal Nb rod clad copper layer;
FIG. 4 is a schematic cross-sectional view of a circular Nb rod wrapped copper layer;
In the figure: 1. the steel wire comprises an oxygen-free copper sheath, 2. a pure Nb rod, 3. a hexagonal oxygen-free copper rod, 4. a CuNb single core rod, 5. an Nb rod and 6. a copper layer.
Detailed Description
The following description will be made in further detail with reference to the accompanying fig. 1 to 4 and examples, but the method of the present invention is not limited to the following examples.
example 1
A preparation method of a composite rod for improving the superconducting composite linear performance of Nb 3 Sn specifically comprises the following steps:
Step 1: cleaning the Nb rod 5, and wrapping the Nb rod 5 with a copper layer 6 to obtain a CuNb single-core rod 4, wherein the copper layer 6 is 10 mu m in thickness and 300mm in length;
Step 2: packing the CuNb single core rod 4, the pure Nb rods 2 and the hexagonal oxygen-free copper rods 3 in the oxygen-free copper sheath 1 according to hexagonal arrangement, and sequentially from outside to inside: the method comprises the following steps of preparing an oxygen-free copper sheath 1, pure Nb rods 2, a CuNb single core rod 4 and a hexagonal oxygen-free copper rod 3, wherein the CuNb single core rods 4 are densely distributed at the periphery of the hexagonal close-packed hexagonal oxygen-free copper rod 3, the pure Nb rods 2 are redistributed at the periphery of the CuNb single core rod 4 and then are put into the oxygen-free copper sheath 1, vacuum electron beam sealing welding is adopted at two ends of the CuNb composite sheath to obtain a CuNb composite sheath, the pure Nb rods 2 and the hexagonal oxygen-free copper rod 3 in the step 2 are the same as the CuNb single core rod 4 in size, and the diameter of the oxygen-free copper sheath;
And step 3: and (3) insulating the CuNb composite sheath obtained in the step (2) at the temperature of 550 ℃ for 1 hour, and extruding to obtain the composite rod.
In the present embodiment, in step 1, the Nb rod 5 is circular, the diameter of the circular Nb rod is 5mm, and the manner of wrapping the copper layer 6 with the Nb rod 5 is electroplating. In step 2, 1 layer of pure Nb rods 2 is distributed.
Example 2
The difference from example 1 is that: in step 1 described in this example, the Nb rod 5 is wrapped around the copper layer 6 in an oxygen-free copper foil winding manner.
example 3
A preparation method of a composite rod for improving the superconducting composite linear performance of Nb 3 Sn specifically comprises the following steps:
Step 1: cleaning the Nb rod 5, and wrapping the Nb rod 5 with a copper layer 6 to obtain a CuNb single-core rod 4, wherein the copper layer 6 is 300 mu m in thickness and 800mm in length;
Step 2: packing the CuNb single core rod 4, the pure Nb rods 2 and the hexagonal oxygen-free copper rods 3 in the oxygen-free copper sheath 1 according to hexagonal arrangement, and sequentially from outside to inside: the method comprises the following steps of preparing an oxygen-free copper sheath 1, pure Nb rods 2, a CuNb single core rod 4 and a hexagonal oxygen-free copper rod 3, wherein the CuNb single core rods 4 are densely distributed at the periphery of the hexagonal close-packed hexagonal oxygen-free copper rod 3, the pure Nb rods 2 are redistributed at the periphery of the CuNb single core rod 4 and then are put into the oxygen-free copper sheath 1, vacuum electron beam sealing welding is adopted at two ends of the CuNb composite sheath to obtain a CuNb composite sheath, the pure Nb rods 2 and the hexagonal oxygen-free copper rod 3 in the step 2 are the same as the CuNb single core rod 4 in size, and the diameter phi of the oxygen-free copper;
And step 3: and (3) insulating the CuNb composite sheath obtained in the step (2) at 650 ℃ for 4 hours, and extruding to obtain the composite rod.
In the present embodiment, in step 1, the Nb rod 5 is circular, the diameter of the circular Nb rod is 15mm, and the manner of wrapping the copper layer 6 with the Nb rod 5 is electroplating. In step 2, 3 layers of pure Nb rods 2 are distributed.
Example 4
the difference from example 3 is that: in step 1 described in this example, the Nb rod 5 is wrapped around the copper layer 6 in an oxygen-free copper foil winding manner.
Example 5
A preparation method of a composite rod for improving the superconducting composite linear performance of Nb 3 Sn specifically comprises the following steps:
Step 1: cleaning the Nb rod 5, and wrapping the Nb rod 5 with a copper layer 6 to obtain a CuNb single-core rod 4, wherein the copper layer 6 is 150 mu m in thickness and 500mm in length;
Step 2: packing the CuNb single core rod 4, the pure Nb rods 2 and the hexagonal oxygen-free copper rods 3 in the oxygen-free copper sheath 1 according to hexagonal arrangement, and sequentially from outside to inside: the method comprises the following steps of preparing an oxygen-free copper sheath 1, pure Nb rods 2, a CuNb single core rod 4 and a hexagonal oxygen-free copper rod 3, wherein the CuNb single core rods 4 are densely distributed at the periphery of the hexagonal close-packed hexagonal oxygen-free copper rod 3, the pure Nb rods 2 are redistributed at the periphery of the CuNb single core rod 4 and then are put into the oxygen-free copper sheath 1, vacuum electron beam sealing welding is adopted at two ends of the CuNb composite sheath to obtain a CuNb composite sheath, the pure Nb rods 2 and the hexagonal oxygen-free copper rod 3 in the step 2 are the same as the CuNb single core rod 4 in size, and the diameter of the oxygen-free copper sheath;
and step 3: and (3) insulating the CuNb composite sheath obtained in the step (2) at the temperature of 600 ℃ for 2 hours, and extruding to obtain the composite rod.
in the present embodiment, in step 1, the Nb rod 5 is circular, the diameter of the circular Nb rod is 10mm, and the manner of wrapping the copper layer 6 with the Nb rod 5 is electroplating. In step 2, 2 layers of pure Nb rods 2 are distributed.
Example 6
the difference from example 5 is that: in step 1 described in this example, the Nb rod 5 is wrapped around the copper layer 6 in an oxygen-free copper foil winding manner.
example 7
A preparation method of a composite rod for improving the superconducting composite linear performance of Nb 3 Sn specifically comprises the following steps:
step 1: cleaning the Nb rod 5, and wrapping the Nb rod 5 with a copper layer 6 to obtain a CuNb single-core rod 4, wherein the copper layer 6 is 10 mu m in thickness and 300mm in length;
Step 2: packing the CuNb single core rod 4, the pure Nb rods 2 and the hexagonal oxygen-free copper rods 3 in the oxygen-free copper sheath 1 according to hexagonal arrangement, and sequentially from outside to inside: the method comprises the following steps of preparing an oxygen-free copper sheath 1, pure Nb rods 2, a CuNb single core rod 4 and a hexagonal oxygen-free copper rod 3, wherein the CuNb single core rods 4 are densely distributed at the periphery of the hexagonal close-packed hexagonal oxygen-free copper rod 3, the pure Nb rods 2 are redistributed at the periphery of the CuNb single core rod 4 and then are put into the oxygen-free copper sheath 1, vacuum electron beam sealing welding is adopted at two ends of the CuNb composite sheath to obtain a CuNb composite sheath, the pure Nb rods 2 and the hexagonal oxygen-free copper rod 3 in the step 2 are the same as the CuNb single core rod 4 in size, and the diameter of the oxygen-free copper sheath;
and step 3: and (3) insulating the CuNb composite sheath obtained in the step (2) at the temperature of 550 ℃ for 1 hour, and extruding to obtain the composite rod.
In the embodiment, in the step 1, the Nb rod 5 is hexagonal, the length of opposite sides of the hexagonal Nb rod is 5mm, and the Nb rod 5 is wrapped by the copper layer 6 by electroplating. In step 2, 1 layer of pure Nb rods 2 is distributed.
Example 8
The difference from example 7 is that: in step 1 described in this example, the Nb rod 5 is wrapped around the copper layer 6 in an oxygen-free copper foil winding manner.
Example 9
A preparation method of a composite rod for improving the superconducting composite linear performance of Nb 3 Sn specifically comprises the following steps:
Step 1: cleaning the Nb rod 5, and wrapping the Nb rod 5 with a copper layer 6 to obtain a CuNb single-core rod 4, wherein the copper layer 6 is 300 mu m in thickness and 800mm in length;
step 2: packing the CuNb single core rod 4, the pure Nb rods 2 and the hexagonal oxygen-free copper rods 3 in the oxygen-free copper sheath 1 according to hexagonal arrangement, and sequentially from outside to inside: the method comprises the following steps of preparing an oxygen-free copper sheath 1, pure Nb rods 2, a CuNb single core rod 4 and a hexagonal oxygen-free copper rod 3, wherein the CuNb single core rods 4 are densely distributed at the periphery of the hexagonal close-packed hexagonal oxygen-free copper rod 3, the pure Nb rods 2 are redistributed at the periphery of the CuNb single core rod 4 and then are put into the oxygen-free copper sheath 1, vacuum electron beam sealing welding is adopted at two ends of the CuNb composite sheath to obtain a CuNb composite sheath, the pure Nb rods 2 and the hexagonal oxygen-free copper rod 3 in the step 2 are the same as the CuNb single core rod 4 in size, and the diameter phi of the oxygen-free copper;
and step 3: and (3) insulating the CuNb composite sheath obtained in the step (2) at 650 ℃ for 4 hours, and extruding to obtain the composite rod.
in the embodiment, in the step 1, the Nb rod 5 is hexagonal, the length of opposite sides of the hexagonal Nb rod is 15mm, and the Nb rod 5 is wrapped by the copper layer 6 by electroplating. In step 2, 3 layers of pure Nb rods 2 are distributed.
example 10
The difference from example 9 is that: in step 1 described in this example, the Nb rod 5 is wrapped around the copper layer 6 in an oxygen-free copper foil winding manner.
Example 11
A preparation method of a composite rod for improving the superconducting composite linear performance of Nb 3 Sn specifically comprises the following steps:
Step 1: cleaning the Nb rod 5, and wrapping the Nb rod 5 with a copper layer 6 to obtain a CuNb single-core rod 4, wherein the copper layer 6 is 150 mu m in thickness and 500mm in length;
Step 2: packing the CuNb single core rod 4, the pure Nb rods 2 and the hexagonal oxygen-free copper rods 3 in the oxygen-free copper sheath 1 according to hexagonal arrangement, and sequentially from outside to inside: the method comprises the following steps of preparing an oxygen-free copper sheath 1, pure Nb rods 2, a CuNb single core rod 4 and a hexagonal oxygen-free copper rod 3, wherein the CuNb single core rods 4 are densely distributed at the periphery of the hexagonal close-packed hexagonal oxygen-free copper rod 3, the pure Nb rods 2 are redistributed at the periphery of the CuNb single core rod 4 and then are put into the oxygen-free copper sheath 1, vacuum electron beam sealing welding is adopted at two ends of the CuNb composite sheath to obtain a CuNb composite sheath, the pure Nb rods 2 and the hexagonal oxygen-free copper rod 3 in the step 2 are the same as the CuNb single core rod 4 in size, and the diameter of the oxygen-free copper sheath;
And step 3: and (3) insulating the CuNb composite sheath obtained in the step (2) at the temperature of 600 ℃ for 2 hours, and extruding to obtain the composite rod.
In the embodiment, in the step 1, the Nb rod 5 is hexagonal, the length of opposite sides of the hexagonal Nb rod is 10mm, and the Nb rod 5 is wrapped by the copper layer 6 by electroplating. In step 2, 2 layers of pure Nb rods 2 are distributed.
Example 12
The difference from example 11 is that: in step 1 described in this example, the Nb rod 5 is wrapped around the copper layer 6 in an oxygen-free copper foil winding manner.
Claims (6)
1. A preparation method of a composite rod for improving the superconducting composite linear performance of Nb 3 Sn is characterized by comprising the following steps:
Step 1: cleaning the Nb rod, and wrapping the Nb rod with a copper layer to obtain a CuNb single core rod;
Step 2: packing the CuNb single core rod, the pure Nb rods and the hexagonal oxygen-free copper rods in the step 1 into an oxygen-free copper sheath in a hexagonal arrangement and bundling manner, wherein the process from outside to inside comprises the following steps: the method comprises the following steps that oxygen-free copper sheaths, pure Nb rods, CuNb single core rods and hexagonal oxygen-free copper rods, CuNb single core rods are distributed on the peripheries of hexagonal close-packed hexagonal oxygen-free copper rods in a close-packed manner, the pure Nb rods are redistributed on the peripheries of the CuNb single core rods and then are arranged in the oxygen-free copper sheaths, vacuum electron beam sealing welding is adopted at two ends of the CuNb single core rods to obtain CuNb composite sheaths, and the pure Nb rods, the hexagonal oxygen-free copper rods and the CuNb single core rods in the step 2 are the same in size;
And step 3: and (3) insulating the CuNb composite sheath obtained in the step (2) at the temperature of 550-650 ℃ for 1-4 hours, and extruding to obtain the composite rod.
2. the method of manufacturing a composite rod according to claim 1, wherein the Nb rods in step 1 are round or hexagonal, the round Nb rods have a diameter of 5 to 15mm, and the hexagonal Nb rods have opposite sides with a length of 5 to 15 mm.
3. The method of manufacturing a composite rod according to claim 1 or 2, wherein the Nb rod is wrapped with the copper layer in step 1 by electroplating or by winding with an oxygen-free copper foil.
4. The method for preparing a composite rod according to claim 3, wherein the thickness of the copper layer wound by the electroplating or oxygen-free copper foil is 10 to 300 μm and the length is 300 to 800 mm.
5. The method for preparing a composite rod according to claim 3, wherein the diameter phi of the oxygen-free copper sheath in the step 2 is 150-300 mm.
6. The method of manufacturing a composite rod according to claim 5, wherein the pure Nb rods in step 2 are distributed in 1 to 3 layers.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111105901A (en) * | 2019-12-23 | 2020-05-05 | 福建师范大学 | Improved bronze Nb method3Preparation method of Sn superconducting wire |
| CN113373404A (en) * | 2021-06-10 | 2021-09-10 | 中国科学院近代物理研究所 | Copper-based thick-wall Nb3Sn film superconducting cavity and preparation method thereof |
| CN114783682A (en) * | 2022-06-17 | 2022-07-22 | 西部超导材料科技股份有限公司 | Preparation method of low-temperature direct-current twisted pair for quantum computer |
| CN116453757A (en) * | 2023-06-09 | 2023-07-18 | 西安聚能超导线材科技有限公司 | Nb with low copper ratio 3 Preparation method of Sn superconducting wire |
| CN116612930A (en) * | 2023-07-20 | 2023-08-18 | 西安聚能超导线材科技有限公司 | Nb (Nb) alloy 3 Sn superconducting wire preparation method and superconducting wire |
| CN118136332A (en) * | 2024-05-06 | 2024-06-04 | 西安聚能超导线材科技有限公司 | CuNb composite rod for low-loss superconducting wire and preparation method thereof |
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| CN114783682A (en) * | 2022-06-17 | 2022-07-22 | 西部超导材料科技股份有限公司 | Preparation method of low-temperature direct-current twisted pair for quantum computer |
| CN114783682B (en) * | 2022-06-17 | 2022-09-09 | 西部超导材料科技股份有限公司 | Preparation method of low-temperature direct-current twisted pair for quantum computer |
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Application publication date: 20191210 |