Electrical contact for use in a circuit breaker and a method of

Details Electrical contact for use in a circuit breaker and a method of Electrical contact for use in a circuit breaker and a method of

1996-04-01

1998-11-03

Jenkins, Daniel J.

Specialized metallurgical processes, compositions for use therei

Compositions

Consolidated metal powder compositions

75247, 75248, B22F 312, B22F 500

Patent

active

058311866

ABSTRACT:
An electrical contact for use in an electrical switching device is provided having low contact resistance, high wear resistance and high anti-weld characteristics. The contact includes a material composition of between 0.2 and 8% by weight Gr, between 10 and 90% by weight W and the remaining mixture consisting of Ag. The contact is manufactured using a process which yields a unique microstructure characterized by not having an interconnected Gr network around the Ag thereby providing a strong Ag to Ag bond. This process includes the steps of adding the appropriate amounts of Ag, W and Gr powder material together, blending together under low shear conditions to provide a homogenous powder mixture while prohibiting the Gr from smearing onto the Ag, pressing the material mixture to form a contact, and then sintering and coining the contact.

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