Cr-Cu焼結材の機械的特性に及ぼすTe添加の影響

概要

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Cr-Cu sintered electric-contacts for vacuum insulated switch need to be separated easily when they were welded together by Joule heat, besides they need to have high electric-conduction and heavy-voltage insulation. Therefore, the Cr-Cu sintered materials for electric-contacts need to have a compatibility of high density and low strength. In this work, we designed a new alloy of which strength is reduced by an addition of low melting point metal and evaluated mechanical property.20 mass% Cr-Cu alloys added with 0 to 1 mass% Te were prepared by sintering at 1333K in an inert atmosphere, and tensile strength of them were evaluated. Tensile strength decreased about 40% by addition of more than 0.05 mass% of Te. Gaps between Cr particles and Cu matrix were found in the fractured surface. The reduction in strength by addition of Te is considered to be caused by the gaps.
社団法人粉体粉末冶金協会の論文
2007-10-15