Method of making a valve metal powder for electrolytic condenser

Details Method of making a valve metal powder for electrolytic condenser Method of making a valve metal powder for electrolytic condenser

1984-08-06

1986-04-15

Brody, Christopher W.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 05BB, 75121, 75251, 75101R, B22F 900

Patent

active

045825300

ABSTRACT:
In the production of a vanadium group valve metal powder, especially tantalum, the reaction mixture of a double fluoride salt of the valve metal and metallic sodium and/or potassium is doped with sulfur before a melt cake is formed. The melt cake is then leached with water to eliminate central salts leaving the valve metal powder. The sulfur doping provides improved surface area and particle size characteristics.

REFERENCES:
patent: 3647415 (1972-03-01), Yano et al.
patent: 3825802 (1974-07-01), Kumagai et al.
patent: 4009007 (1977-02-01), Fry
patent: 4128421 (1978-12-01), Marsh
patent: 4356028 (1982-10-01), Bates

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