METHOD OF PRODUCTION OF HARD-ALLOY COMPOSITE MATERIAL Russian patent published in 2003 - IPC

FIELD: powder metallurgy; production of electric contact materials. SUBSTANCE: method includes mixing, molding and liquid-phase sintering where tungsten carbide, cobalt carbide and copper carbide powders are mixed; then, alcohol solution of orthophosphoric acid is introduced in mixture thus obtained at the following relationship of components, wt.%: Cu, 10-40; H₃PO₄, 0.6-6; WC-Co, the balance. Said mixture is plasticized in rubber solvent and sintering is performed in vacuum furnaces. EFFECT: enhanced electrical and thermal conductivity at retained high strength and wear resistant properties; facilitated procedure of production. 1 tbl