Process for producing molybdenum-ruthenium metal powder

Details Process for producing molybdenum-ruthenium metal powder Process for producing molybdenum-ruthenium metal powder

1988-04-25

1989-08-22

Roy, Upendra

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

420429, B22F 920

Patent

active

048592366

ABSTRACT:
A process is disclosed for producing molybdenum-ruthenium metal powder which comprises forming an ammonium molybdate solution, heating that solution to drive off excess ammonia, and thereafter adding ruthenium dioxide to that heated ammonium molybdate solution to form a slurry of ruthenium dioxide in the ammonium molybdate solution. Molybdenum trioxide and ruthenium dioxide are then crystallized from the slurry to produce a uniform mixture of molybdenum trioxide and ruthenium dioxide which is heated at a temperature of from about 300.degree. C. to about 800.degree. C. for a sufficient time in a reducing atmosphere to reduce the molybdenum trioxide and ruthenium dioxide to their respective metals and form a uniform mixture of the metals. The metal mixture is heated at a temperature of from about 800.degree. C. to about 1200.degree. C. for a sufficient time in a reducing atmosphere to stabilize the mixture at a particle size of -325 mesh, and then cooled in a non-reacting atmosphere.

REFERENCES:
patent: 4294608 (1981-10-01), Sedlak et al.
patent: 4397682 (1983-08-01), Watanabe et al.

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