Reducing the oxygen content of tantalum

Details Reducing the oxygen content of tantalum Reducing the oxygen content of tantalum

1984-03-19

1985-04-02

Stallard, W.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

B22F 900

Patent

active

045085633

ABSTRACT:
The oxygen content of tantalum is reduced by intimately contacting the tantalum with an alkali metal halide, reacting them in a non-oxidizing atmosphere at a maximum temperature of 1200.degree. C. to form and expel the tantalum halide and alkali metal oxide formed by the reaction, and then raising the temperature to 1400.degree. C. for no longer than 10 min. to volatilize any excess alkali metal halide. The tantalum may be in the form of a powder or a porous sintered pellet, and an improved product for electrolytic capacitors, with lower leakage current, is obtained.

REFERENCES:
patent: 3169862 (1965-02-01), Scheller
patent: 3415639 (1968-12-01), Daendlikev et al.
patent: 3697255 (1972-10-01), Baldwin et al.
patent: 4231790 (1980-11-01), Hahn et al.

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