Contact forming material for a vacuum interrupter

Details Contact forming material for a vacuum interrupter Contact forming material for a vacuum interrupter

1989-07-28

1992-09-22

Lechert, Jr., Stephen J.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75242, 75247, 420497, 420503, 428551, 419 18, 200265, C22C 2908

Patent

active

051493624

ABSTRACT:
An Ag-Cu-WC contact forming material for a vacuum interrupter comprising a highly conductive component comprising Ag and Cu and an arc-proof component comprising WC wherein the content of the highly conductive component is such that the total amount of Ag and Cu(Ag+Cu) is from 25% to 65% by weight and the percentage of Ag based on the total amount of Ag and Cu[Ag/(Ag+Cu)] is from 40% to 80% by weight; wherein the content of the arc-proof component is from 35% to 75% by weight; wherein the structure of the highly conductive component comprises a matrix and a discontinuous phase, the discontinuous phase having a thickness or width of no more than 5 micrometers and wherein said arc-proof component comprises a discontinuous grain having a grain size of no more than 1 micrometer.

REFERENCES:
patent: 3807965 (1974-04-01), Tazaki et al.
patent: 3859087 (1975-01-01), Backstrom
patent: 3992199 (1976-11-01), Neely
Chemical Abstracts, vol. 85, No. 6, Aug. 9, 1976, p. 496, ref. No. 39953t.

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