Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1977-04-13
1978-02-07
Rutledge, L. Dewayne
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 05, 75 05A, 75 05AA, 75 05B, 75 05BA, 2523011W, 423 11, 423 42, 423 50, 423 55, 423 65, 423 81, 423 92, 423101, 423122, 423143, 423158, 423194, 423 85, 423592, 423594, 423596, 423643, B22F 102, C21C 1500, C22B 502, C22C 4300
Patent
active
040725014
ABSTRACT:
Metal powders, metal oxide powders, and mixtures thereof of controlled particle size are provided by reacting an aqueous solution containing dissolved metal values with excess urea. Upon heating, urea reacts with water from the solution leaving a molten urea solution containing the metal values. The molten urea solution is heated to above about 180.degree. C. whereupon metal values precipitate homogeneously as a powder. The powder is reduced to metal or calcined to form oxide particles. One or more metal oxides in a mixture can be selectively reduced to produce metal particles or a mixture of metal and metal oxide particles.
REFERENCES:
patent: 3669632 (1972-06-01), Kanij et al.
patent: 3778380 (1973-12-01), Baker et al.
patent: 3862908 (1975-01-01), Fitch et al.
patent: 3962114 (1976-06-01), Berreth
patent: 4010242 (1977-03-01), Iler et al.
Carlson Dean E.
Hamel Stephen D.
Lewis Michael L.
Rutledge L. Dewayne
The United States of America as represented by the United States
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