| 摘要 |
PROBLEM TO BE SOLVED: To provide a contact material for a vacuum circuit breaker having a low impurity content, further having reduced hardness by the reduction of the solid solution concentration of Cr solid-soluted into a Cu phase, so as to improve its formability and to be easily mass-produced, to provide a method for producing the same, and to provide a vacuum circuit breaker. SOLUTION: In the Cu-Cr alloy powder obtained by melting and dispersing a Cu-Cr material composed of Cu as a highly electrically conductive component and Cr as an arc resistant component and further rapidly cooling the same, the solid solution concentration of Cr in the Cu phase is≤200 ppm. The alloy powder is suitably used as the constituting material of a contact for a vacuum circuit breaker. COPYRIGHT: (C)2007,JPO&INPIT
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