| 摘要 |
PROBLEM TO BE SOLVED: To control the thermal expanding characteristics of the alloy to those of the material to be joined an to obtain excellent heat radiability by providing the surface of a copper alloy with a two phase metallic structure composed of copper and copper oxide with a layer of copper only. SOLUTION: Copper oxide is preferably composed of Cu2O. In the mother phase of copper and copper oxide grains having low thermal expanding characteristics composing the two phase metallic structure, by changing the volume ratio of copper oxide, the control of the thermal expanding characteristics is possible. Using a powdery mixture of copper powder and copper oxide powder, sinetring is executed in a reducing atmosphere, and a layer of copper only is formed on the surface side of the copper alloy with the two phase metallic structure whose inside is composed of copper and copper oxide by reduction. Or, using a powdery mixture of copper powder and copper oxide powder, press-sintering is executed, simultaneously, a board made of copper or a vessel made of copper arranged at the outside of the whole of the powdery mixture and the powdery mixture sintered body are joined to obtain a low thermal expansion copper alloy in which a layer of copper only is formed on the surface of the copper alloy having the two phase structure composed of copper and copper oxide.
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