Method of making electrical contact material
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United States of America Patent
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Feb 10, 1981
Issued Date -
N/A
app pub date -
Apr 9, 1979
filing date -
Apr 9, 1979
priority date (Note) -
Expired
status (Latency Note)
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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.
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