Process of making a contact forming material for a vacuum valve

Details Process of making a contact forming material for a vacuum valve Process of making a contact forming material for a vacuum valve

1988-07-26

1989-05-16

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Controlled cooling after sintering

419 27, 419 58, 419 60, B22F 326

Patent

active

048308218

ABSTRACT:
A contact forming material for a vacuum valve or vacuum circuit breaker comprising (a) a conductive material consisting of copper and/or silver, and (b) an arc-proof material consisting of chromium, titanium, zirconium, or an alloy thereof wherein the amount of said arc-proof material present in said conductive material matrix is no more than 0.35% by weight. This contact forming material is produced by a process which comprises the steps of compacting arc-proof material powder into a green compact, sintering said green compact to obtain a skeleton of the arc-proof material, infiltrating the voids of said skeleton with a conductive material, and cooling the infiltrated material. The contact forming material can provide contacts for a vacuum valve or vacuum circuit breaker which has excellent characteristics such as temperature rise characteristic and contact resistance characteristic.

REFERENCES:
patent: 3960554 (1976-06-01), Gaines
patent: 3992199 (1976-11-01), Neely
patent: 4503010 (1985-03-01), Kippenberg et al.
patent: 4710223 (1987-12-01), Matejczyk

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