Fuji Electric Co., Ltd.

Kazuro Shibata

Hisaji Shinohara

Masayuki Furusawa

Tatsuo Take

Shunichi Hatakeyama

Hiromi Iwai

Yukio Osawa

Katsuhiko Taguchi

Katsuro Shiozaki

Nobuyuki Odaka

Tsuneki Shinokura

Shoichi Ote

To provide a Cu-Cr alloy electrode material, a mixture of Cu and cr materials at a predetermined ratio is heated until the mixture has been entirely melted, and the molten metal obtained is quenched to precipitate fine Cr particles in a Cu base. Since Cr is melted into Cu before quenching, and then Cr precipitates, Cr particles finer than those in the sintering or infiltration method can disperse in a Cu base. This invention prevents defects such as voids in the structure and the weakening of the fusion of Cu and Cr or failure of Cr to precipitate into the Cu base caused by oxide films on the surface of the Cr particles, thereby providing a fine alloy structure.

Method for manufacturing electrode material for vacuum circuit breaker

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.

Contact material for a vacuum circuit breaker and a method for

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Saitama, Japan

Kazuro Shibata