Contact material for a vacuum circuit breaker and a method for manufacturing the same
AssigneeFuji Electric Co., Ltd.
InventorsMasayuki Furusawa, Hisaji Shinohara, Nobuyuki Odaka, Katsuhiko Taguchi, Yukio Osawa, Kazuro Shibata, Shoichi Ote
Life of this patent
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Abstract
Interrupting and chopping characteristics of a Cu--Cr contact alloy are improved by rounding Cr particles to be spherical in the alloy. The Cr particles are rounded in the alloy by sintering raw Cr powder particles having an average particle diameter of less than 100 .mu.m at a temperature of 1,100.degree. C. or higher with Cu powder, or by sintering raw Cr powder particles having an average particle diameter of 100 to 150 .mu.m at a temperature of 1,200.degree. C. or higher with Cu powder.
Claims14
A contact material for a vacuum circuit breaker, comprising an alloy containing copper and spherical chrome particles disposed in the copper, said alloy being prepared by sintering chrome particles having an average grain diameter of less than 100 .mu.m and powdery copper at a temperature of at least 1,100.degree. C. to melt the chrome particles into molten copper, and cooling a mixture containing said chrome and copper so that chrome once dissolved in copper precipitates in copper as finely grained particles, which are distributed uniformly.
A method for manufacturing a contact material for a vacuum circuit breaker, comprising
- sintering chrome particles having an average grain diameter of less than 100 .mu.m and powdery copper at a temperature of at least 1,100.degree. C. to melt the chrome particles into molten copper, and
- cooling a mixture containing chrome and copper so that chrome once dissolved in copper precipitates in copper as finely grained particles, which are distributed uniformly.
A method for manufacturing a contact material for a vacuum circuit breaker, comprising
- sintering chrome particles having an average grain diameter from 100 to 150 .mu.m and powdery copper at a temperature of at least 1,200.degree. C. to melt the chrome particles into molten copper, and
- cooling a mixture containing said chrome and copper so that chrome once dissolved in copper precipitates in copper as finely grained particles, which are distributed uniformly.
A contact material for a vacuum circuit breaker, comprising an alloy containing copper and spherical chrome particles disposed in the copper, said alloy being prepared by sintering chrome particles having an average grain diameter from 100 to 150 .mu.m and powdery copper at a temperature of at least 1,200.degree. C. to melt the chrome particles into molten copper, and cooling a mixture containing said chrome and copper so that chrome once dissolved in copper precipitates in copper as finely grained particles, which are distributed uniformly.
Dependencies are inferred from the claim text.