Method of producing copper-chromium fusion alloys as contact...

Details Method of producing copper-chromium fusion alloys as contact... Method of producing copper-chromium fusion alloys as contact...

C - Chemistry, Metallurgy

22

C

53/119, 53/282,

C22C 1/02 (2006.01) B22F 3/24 (2006.01) H01H 1/02 (2006.01) H01H 33/66 (2006.01)

Patent

CA 1220630

ABSTRACT OF THE DISCLOSURE A method of producing copper-chromium fusion alloys hav- ing a chromium content of at least 25% by mass and at most 60% by mass with a homogeneous macrostructure without lattice defects and without shrink holes or pipes, which can be used as contact mate- rial for vacuum power switches with breaking currents exceeding 10 kA. According to the invention, during fusing of the starting material to the fusion alloy an overheating to at least 2273 K is obtained at least in a partial zone of the instantaneous melt volume. Thereafter the melt is cooled at a cooling rate such that no primary Cr precipitation or segregation occurs.

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