Method for making vacuum circuit breaker electrodes

Details Method for making vacuum circuit breaker electrodes Method for making vacuum circuit breaker electrodes

1987-09-02

1989-06-06

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Metal and nonmetal in final product

419 12, 419 13, 419 19, 419 23, 419 28, 419 47, 419 49, 419 54, 419 55, 419 58, B22F 324

Patent

active

048369780

ABSTRACT:
A production method of a vacuum circuit breaker electrode comprises the steps of mixing conductive metal powder, and refractory material powder with a higher melting point than said conductive metal powder, compacting the resultant mixture to form a compact, presintering the compact in a atmosphere of high purity hydrogen, sealing a presintered body in a capsule while exhausting, heating and degassing, and subjecting the sealed capsule to hot isostatic pressing treatment. The conductive metal powder is one or both of Cu and Ag. The hot isostatic pressing treatment is effected at a temperature higher than a melting point of the conductive metal so that the presintered body is sintered under liquid phase, and a part of molten conductive metal component is seeped out on a sintered body surface.

REFERENCES:
patent: 4547639 (1985-10-01), Watanabe et al.
patent: 4626282 (1986-12-01), Naya et al.
patent: 4719078 (1988-01-01), Miyashita et al.

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