Electrical contact material and method of making the same

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

1977-11-29

1979-02-27

Hunt, Brooks H.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75200, 75211, 75224, 75234, 148126, 252514, 428929, 200265, 200266, 200270, B22F 300, H01H 102

Patent

active

041417275

ABSTRACT:
An electrical contact material comprising silver, bismuth oxide and tin oxide with or without tin metal, wherein the amounts of the bismuth and the tin on the basis of the sum weight of the metals in both the metal component and in the metal oxide component are 1.5 to 6 weight percent and 0.1 to 6 weight percent, respectively. This electrical contact material has high resistance to both welding and arc erosion. An advantageous method of making the electrical contact material comprises preparing a metal alloy composed of all the above metals in the above weight ratio and internally oxidizing the bismuth completely in the alloy after shaping the alloy to a desired electrical contact material shape or after crushing the alloy to scaly flakes.

REFERENCES:
patent: 2486341 (1949-10-01), Stumbock
patent: 2890315 (1959-06-01), Graves, Jr.
patent: 3205565 (1965-09-01), MacDonald
patent: 3489531 (1970-01-01), Schreiner et al.

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