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GB744145A - Electrical contacts and process for making same - Google Patents

Electrical contacts and process for making same

Info

Publication number
GB744145A
GB744145A GB5004/53A GB500453A GB744145A GB 744145 A GB744145 A GB 744145A GB 5004/53 A GB5004/53 A GB 5004/53A GB 500453 A GB500453 A GB 500453A GB 744145 A GB744145 A GB 744145A
Authority
GB
United Kingdom
Prior art keywords
contact
sintered
bars
tungsten
thorium
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.)
Expired
Application number
GB5004/53A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB744145A publication Critical patent/GB744145A/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C27/00—Alloys based on rhenium or a refractory metal not mentioned in groups C22C14/00 or C22C16/00
    • C22C27/04—Alloys based on tungsten or molybdenum
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C32/00—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ
    • C22C32/001—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides
    • C22C32/0015—Non-ferrous alloys containing at least 5% by weight but less than 50% by weight of oxides, carbides, borides, nitrides, silicides or other metal compounds, e.g. oxynitrides, sulfides, whether added as such or formed in situ with only oxides with only single oxides as main non-metallic constituents
    • C22C32/0031—Matrix based on refractory metals, W, Mo, Nb, Hf, Ta, Zr, Ti, V or alloys thereof
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/02—Contacts characterised by the material thereof
    • H01H1/021—Composite material

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Composite Materials (AREA)
  • Powder Metallurgy (AREA)
  • Contacts (AREA)

Abstract

An electrical contact having a granular structure is formed from tungsten or molybdenum, with or without copper or nickel or silver, or a tungsten-molybdenum alloy, containing 0,1-1,5 per cent by weight of an oxide of one or more of caesium, barium, zirconium or thorium. During the production of the contact material up to 0,6 per cent of silicates of one or more of the alkali metals may be added to the tungstic and/or molybdic acid used as starting material. In a process for the production of a contact of tungsten containing thorium oxide, thorium nitrate and potassium silicate and/or sodium silicate in the appropriate proportions are added to a solution of pure tungstic acid, the resulting powder being dried and reduced, e.g. in hydrogen, at up to 1000 DEG C. The resultant powder is sieved and pressed into bars, the bars being pre-sintered in hydrogen and then sintered in a reducing atmosphere by passage of an electric current. The sintered bars are forged and heated to 2200 DEG -2500 DEG C. in a reducing atmosphere for 3- 4 minutes followed by rapid cooling to promote grain growth to 1500-2000 grains/mm2. The contact is then formed from the bar. Specification 634,346 is referred to.
GB5004/53A 1952-03-05 1953-02-23 Electrical contacts and process for making same Expired GB744145A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE744145X 1952-03-05

Publications (1)

Publication Number Publication Date
GB744145A true GB744145A (en) 1956-02-01

Family

ID=6647869

Family Applications (1)

Application Number Title Priority Date Filing Date
GB5004/53A Expired GB744145A (en) 1952-03-05 1953-02-23 Electrical contacts and process for making same

Country Status (2)

Country Link
FR (1) FR1083450A (en)
GB (1) GB744145A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2573094A1 (en) * 1984-11-15 1986-05-16 Murex Ltd MOLYBDENE ALLOY AND PROCESS FOR PRODUCING THE SAME
CN114635052A (en) * 2020-12-16 2022-06-17 福建工程学院 TiCN-doped wear-resistant tungsten-copper composite material and preparation method thereof

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2573094A1 (en) * 1984-11-15 1986-05-16 Murex Ltd MOLYBDENE ALLOY AND PROCESS FOR PRODUCING THE SAME
CN114635052A (en) * 2020-12-16 2022-06-17 福建工程学院 TiCN-doped wear-resistant tungsten-copper composite material and preparation method thereof
CN114635052B (en) * 2020-12-16 2023-08-29 福建工程学院 TiCN-doped wear-resistant tungsten copper composite material and preparation method thereof

Also Published As

Publication number Publication date
FR1083450A (en) 1955-01-10

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