| 摘要 |
PROBLEM TO BE SOLVED: To provide an electric contact having a high getter function, stable circuit-breaking performance, voltage resistance and welding resistance and having excellent productivity, to provide its manufacturing method and a vacuum valve and a vacuum circuit breaker using the same. SOLUTION: The electric contact member is composed of a sintered alloy which is prepared by sintering a powder mixture of highly conductive alloy powder and refractory-metal powder and has a structure in which the refractory- metal particles are dispersed in a matrix composed of the highly conductive metal, and the above highly conductive metal is composed of molten alloy. Its manufacturing method and the vacuum valve and the vacuum circuit breaker using it are also provided. To be more concrete, the refractory-metal powder is composed of a mixture of one or more elements among Cr, W, Mo, Ta, Nb, Be, Hf, Ir, Pt, Zr, Ti, Si, Rh and Ru or a compound thereof, and the highly conductive metal is composed of molten alloy containing Cu as a main component and also containing one or more elements among Mg, Al, Ti, Cr, Zr, Sn, Zn, Ni, Co, Fe, Mn and Si.
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