GB1536847A - Electrically conductive composite materials - Google Patents

Electrically conductive composite materials

Info

Publication number
GB1536847A
GB1536847A GB3033875A GB3033875A GB1536847A GB 1536847 A GB1536847 A GB 1536847A GB 3033875 A GB3033875 A GB 3033875A GB 3033875 A GB3033875 A GB 3033875A GB 1536847 A GB1536847 A GB 1536847A
Authority
GB
United Kingdom
Prior art keywords
powder
heating
silver
oxidize
mixture
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
GB3033875A
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.)
Schneider Electric USA Inc
Original Assignee
Square D Co
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 Square D Co filed Critical Square D Co
Priority to GB3033875A priority Critical patent/GB1536847A/en
Publication of GB1536847A publication Critical patent/GB1536847A/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
    • 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
    • C22C32/0021—Matrix based on noble metals, Cu 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
    • H01H1/023—Composite material having a noble metal as the basic material
    • H01H1/0237—Composite material having a noble metal as the basic material and containing oxides
    • H01H1/02372—Composite material having a noble metal as the basic material and containing oxides containing as major components one or more oxides of the following elements only: Cd, Sn, Zn, In, Bi, Sb or Te
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
    • H01H11/04—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts
    • H01H11/048—Apparatus or processes specially adapted for the manufacture of electric switches of switch contacts by powder-metallurgical processes

Abstract

1536847 Internally oxidized alloys SQUARE D CO 12 July 1976 [19 July 1975] 30338/75 Headings C7A and D An electrically conductive composite material sutitable for electrical contacts consists of a mixture of silver, not more than 16À07% zinc oxide with optionally up to 6À13% copper oxide. The method of producing the material involves mixing the zinc and silver powders, heating to form a silver-zinc alloy in powder form by diffusion, then heating the Ag-Zn powder in an oxidizing atmosphere at 180‹C to melting point to oxidize the Zn to ZnO, and compacting to the required shape prior to sintering and coining. Production of Ag-Zn-Cu composites involves the mixing of Zn powder with copper oxide powder to give a Zn-cupric oxide mix, mixing this powder with silver powder, heating the mixture in a reducing atmosphere of H, CO, cracked ammonia, burnt natural gas of propane or a CO-H 2 mixture at 200-700‹C to form a Ag-Zn-Cu alloy powder. The powdered alloy is then subjected to internal oxidation by heating in air or oxygen to oxidize the Zn and re-oxidize the Cu. The oxidized powder is then compacted (about 40 t.s.i.) and sintered preferably about 700‹C for 1-2 hours in air, oxygen or an inert gas prior to coining, to improve the density and to finally dimension the article, at about 60 t.s.i. The material so produced has comparable erosion resistance properties to the standard Ag-CdO composite materials but without their toxicity.
GB3033875A 1976-07-12 1976-07-12 Electrically conductive composite materials Expired GB1536847A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3033875A GB1536847A (en) 1976-07-12 1976-07-12 Electrically conductive composite materials

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3033875A GB1536847A (en) 1976-07-12 1976-07-12 Electrically conductive composite materials

Publications (1)

Publication Number Publication Date
GB1536847A true GB1536847A (en) 1978-12-20

Family

ID=10306049

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3033875A Expired GB1536847A (en) 1976-07-12 1976-07-12 Electrically conductive composite materials

Country Status (1)

Country Link
GB (1) GB1536847A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997027601A2 (en) * 1996-01-26 1997-07-31 Siemens Aktiengesellschaft Method of producing a shaped part from a silver-based contact material

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1997027601A2 (en) * 1996-01-26 1997-07-31 Siemens Aktiengesellschaft Method of producing a shaped part from a silver-based contact material
WO1997027601A3 (en) * 1996-01-26 1997-10-09 Siemens Ag Method of producing a shaped part from a silver-based contact material
US6001149A (en) * 1996-01-26 1999-12-14 Siemens Aktiengesellschaft Process for producing a shaped article from contact material based on silver, contact material and shaped article

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee