Electrical contact material and method for making the same

Details Electrical contact material and method for making the same Electrical contact material and method for making the same

1977-08-25

1979-07-24

Hunt, Brooks H.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

200264, 200265, 200266, 428929, 428567, B22F 500

Patent

active

041621603

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, phosphorus 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: 2620555 (1952-12-01), Lenz
patent: 2694126 (1954-11-01), Binstock
patent: 2818633 (1958-01-01), Hoyer
patent: 3685134 (1972-08-01), Blue
patent: 3864827 (1975-02-01), Schreiner et al.

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