| 摘要 |
PROBLEM TO BE SOLVED: To provide an Au/Ge alloy solder ball having excellent oxidation resistance and satisfactory wettability compared with the conventional one. SOLUTION: The whole other than a surface layer is composed of an alloy having an Au-Ge eutectic composition or an alloy having a composition near the eutectic composition, and the surface layer is composed of an Au solid solution in which Au and Ge are solid-soluted. The maximum height Ry of the surface roughness is≤0.5μm. Regarding its production, a sphere made of an alloy having an Au-Ge eutectic composition or an alloy having a composition near the eutectic composition is charged to a vessel together with pure water admixed with a surfactant, and vibration is applied thereto, thus the Ge content is reduced from the surface layer, so as to modify the surface layer, and thereafter, cleaning is performed, so as to remove the surfactant from the surface. COPYRIGHT: (C)2008,JPO&INPIT
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