METHOD FOR PRODUCING POWDERS OF METALS W, MO, RE, CU, NI, CO AND THEIR ALLOYS Russian patent published in 1995 - IPC

FIELD: powder metallurgy. SUBSTANCE: method involves treating pulverized aqueous-ammonia solution of metal compounds with ammonia in low-temperature plasma followed by recovery of end product from the reaction mixture. Powders of Cu, Ni and Co are produced by treating aqueous-ammonia solutions of their ammine complexes, powders of W, Mo, Re and W-Re alloy by treating aqueous-ammonia solutions of corresponding ammonia salts of metals at a summary mole relation of NH₃ to metal or a sum of metals equal to 3.3-4.0, powder of W-Co alloy by treating aqueous-ammonia solution of paratungstate of ammonium and hexa-amminecobalt III hydroxide at a summary mole relation of NH₃ to the sum of recovered metals equal to 3.3-4.0. The metal content in powders runs to 98.5-99.7% EFFECT: higher efficiency. 6 cl, 2 tbl