Electricity: circuit makers and breakers – Electric switch details – Contact
Patent
1987-01-20
1988-10-11
Recla, Henry J.
Electricity: circuit makers and breakers
Electric switch details
Contact
420469, 420494, 420495, 420501, 420580, 420587, 75 72, 75 73, 200144B, 200265, 200266, C22C 900, H01H 102, H01H 3366
Patent
active
047773359
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.
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Chiba Seishi
Endo Hiroshi
Okawa Mikio
Okutomi Tsutomu
Sekiguchi Tadaaki
Cusick Ernest G.
Kabushiki Kaisha Toshiba
Recla Henry J.
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