Patent ID: 8940404
Filing Date: 2015-01-27
Classification: B32B,C22C,C25D,H01R,Y10S,Y10T

Abstract:
1. A tin-plated copper-alloy material for terminal comprising: a substrate made of Cu or Cu alloy; an Sn-based surface layer formed on a surface of the substrate; and a Cu—Ni—Sn alloy layer including Ni formed between the Sn-based surface layer and the substrate, wherein the Cu—Ni—Sn alloy layer is made of: fine Cu—Ni—Sn alloy particles containing Ni not less than 10 at % and not more than 40 at % in a state of column crystal having a cross-sectional diameter of not less than 0.1 μm and not more than 0.8 μm and an aspect ratio of not less than 1.5; and coarse Cu—Ni—Sn alloy particles having a cross-sectional diameter more than 0.8 μm, an average thickness of the Sn-based surface layer is not less than 0.2 μm and not more than 0.6 μm, an area ratio of the Cu—Ni—Sn alloy layer exposed at a surface of the Sn-based surface layer is not less than 10% and not more than 40%, and a coefficient of kinetic friction of the tin-plated copper-alloy material for terminal is not more than 0.3.