Electrical contact material and its production

Abstract

Abstract PURPOSE:To produce an electrical contact point material having low contact resistance and excellent resistance to welding and consumption by subjecting a precifically composed mechanical alloying powder mixture composed of silver powder, metal carbide powder and graphite powder to press molding and sintering then pressurizing the molding again. CONSTITUTION:The powder mixture by mechanical alloying is prepd. by mixing 97-50wt% silver powder, 3-50% carbide powder of group IVa, Va, VIa metal elements of the periodic table and 0.1-10% graphite powder having <=3mum particle by the total thereof. At least one kind of carbides of W, Mo, Cr, Ta, Nb, V, and Ti are adequately used as the above-mentioned carbide. The resultant powder mixture is then subjected to the press molding, then to the sintering in a reducing atmosphere or vacuum and further, the sintered body is pressurized again to form the alloy having zero porosity. The electrical contact point material consisting of the sintered silver-carbide-graphite alloy having the excellent resistance to welding and consumption and good arc breakage while assuring the low contact resistance is thus obtd.

Inventors

• 👤 Akira Fukui
• 👤 彰 福井

Bibliographic Details