GB577091A - Improvements in and relating to electrical contact elements - Google Patents

Improvements in and relating to electrical contact elements

Info

Publication number
GB577091A
GB577091A GB8480/44A GB848044A GB577091A GB 577091 A GB577091 A GB 577091A GB 8480/44 A GB8480/44 A GB 8480/44A GB 848044 A GB848044 A GB 848044A GB 577091 A GB577091 A GB 577091A
Authority
GB
United Kingdom
Prior art keywords
per cent
zinc oxide
mixture
electrical contact
copper
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
GB8480/44A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co Ltd
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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB577091A publication Critical patent/GB577091A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B1/00—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors
    • H01B1/04—Conductors or conductive bodies characterised by the conductive materials; Selection of materials as conductors mainly consisting of carbon-silicon compounds, carbon or silicon

Abstract

An electrical contact element, such as a brush contact or a movable bearing element, e.g. a rotating slip-ring, commutator, or shaft, particularly for use in dry or rarefied atmospheres, consists of a graphitic material and zinc oxide. Preferably, the contact contains a metal of high electrical conductivity, and may be made of a pressed and sintered mixture of finely-divided metal, such as silver or copper, and graphitic material in approximately equal proportions, and zinc oxide in about 5-30 per cent (preferably 10-20 per cent) by volume. The compressed mixture, enclosed in powdered carbon to prevent reduction of the zinc oxide, is fired at a temperature of 675-750 DEG C. In an example, a mixture of 40 per cent copper, 40 per cent carbon and 20 per cent zinc oxide is used.
GB8480/44A 1943-05-13 1944-05-04 Improvements in and relating to electrical contact elements Expired GB577091A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US577091XA 1943-05-13 1943-05-13

Publications (1)

Publication Number Publication Date
GB577091A true GB577091A (en) 1946-05-03

Family

ID=22012272

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8480/44A Expired GB577091A (en) 1943-05-13 1944-05-04 Improvements in and relating to electrical contact elements

Country Status (1)

Country Link
GB (1) GB577091A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7485998B2 (en) 2002-05-18 2009-02-03 Johnson Electric S.A. Commutator

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7485998B2 (en) 2002-05-18 2009-02-03 Johnson Electric S.A. Commutator

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