Electrical contact material and its manufacturing method

Abstract

Abstract PURPOSE:To produce an electrical contact point material having low contact resistance and excellent resistance to welding and consumption by subjecting a specifically composed mechanical alloying powder mixture composed of silver powder, metal nitride 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% nitride powder of group IVa, Va, VIa, VIIa, VIII metal elements of the periodic table and 0.1-10% graphite powder having <=3mum particle by the total thereof. At least one kind of nitrides of Ti, Zr, Nb, V, Ta, Cr, Mo, Mn, and Fe are adequately used as the above-mentioned nitride. 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-nitride-graphtie 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