ELECTRIC CONTACT MATERIAL AND CLAD RIVET CONTACT OR CLAD CROSS BAR CONTACT, AND AUTOMOBILE RELAY AND TELEVISION POWER SUPPLY RELAY USING THE SAME

摘要

PROBLEM TO BE SOLVED: To provide an Ag matrix which is excellent in welding resistance and whose contact resistance is low, and provide a contact material having the long sevice life. SOLUTION: An Ag solid solution where Sn of 5 to 10wt.% and Bi of 0.3 to 1.5wt.% are brought into solid solution in Ag, is internally oxidized at a temperature not less than its melting point, and is actualized as SnO2 of 4.1 to 11.9wt.%, Sn2 Bi2 O7 of 1.1 to 5.3wt.% Bi2 O3 not more than 0.01wt.%, and SnO2 and Sn2 Bi2 O7 are dispersed as a spherical body having an average particle diameter of 0.1 to 0.7m, and a residual part is obtained as Ag, and an electric contact material is obtained. Next, a clad rivet contact point whose surface layer is composed of the electric contact material and base layer is formed as a two-layer to three-layer clad being Cu or Cu alloy is obtained, or a clad cross bar contact formed as a two-layer to five-layer clad is obtained. Next, an automobile relay and a television power supply relay are obtained which uses the clad rivet contact and the clad cross bar contact as an electric contactor.