Method of making electrical contact material

Details Method of making electrical contact material Method of making electrical contact material

1979-04-09

1981-02-10

Hunt, Brooks H.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75 05R, 75213, B22F 100

Patent

active

042499445

ABSTRACT:
An electrical contact material which is particularly well suited for use in circuit breaker switches consisting essentially of silver in the amount of about 20% to 50% by weight, nickel in the amount of about 2% to 13% by weight, phosphorous in the amount of about 90 ppm to 1000 ppm, and the remainder tungsten. In one embodiment of the contact material forming method provided by the invention, starting particle sizes and liquid phase sintering parameters are selected to yield a relatively coarse grain size in the contact material microstructure with an optimum combination of resistance to oxidation, electrical erosion and distortion associated with high-current interruptions.

REFERENCES:
patent: 3175903 (1965-03-01), Herron
patent: 3453105 (1969-07-01), Flaks et al.
patent: 3473915 (1969-10-01), Pierret
patent: 3832156 (1974-08-01), Wilson et al.
patent: 3846126 (1974-11-01), Foley
patent: 3859087 (1975-01-01), Backstrom

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