SILVER-COATED COMPOSITE MATERIAL FOR MOVABLE CONTACT COMPONENT, METHOD FOR PRODUCING SAME, AND MOVABLE CONTACT COMPONENT

摘要

Disclosed are: a silver-coated composite material for a movable contact component, which has excellent plating adhesion even under repeated shear stress, while having a stably low contact resistance for a long period of time, and which provides a switch with improved life; and a movable contact component. Specifically disclosed is a silver-coated composite material for a movable contact component, wherein: a base layer that is composed of nickel, cobalt, an nickel alloy or a cobalt alloy is formed on at least a part of the surface of a stainless steel substrate; an intermediate layer that is composed of copper or a copper alloy is formed on the base layer; and a silver or silver alloy layer is formed, as the outermost layer, on the intermediate layer. The intermediate layer has a thickness of 0.05-0.3 µm, and the silver or silver alloy forming the outermost layer has an average crystal grain size of 0.5-5 µm.