Specialized metallurgical processes – compositions for use therei – Processes – Electrothermic processes
Patent
1978-11-02
1980-11-04
Rutledge, L. Dewayne
Specialized metallurgical processes, compositions for use therei
Processes
Electrothermic processes
75 845, 75 3, 241 23, B22F 900, C22B 3424
Patent
active
042317908
ABSTRACT:
An anhydrous mixture of extrudable viscosity of an activated alkali metal tantalum or niobium halide powder, an alkali metal halide powder, and a molten alkali metal in about 1:0.75-2.0:4.75-5.5 molar ratio is formed into a paste which is extruded and formed into masses of critical dimensions and temperature. The mass is ignited and a self-sustaining reduction reaction ensues. The reaction product is powdered, washed and dried. The product is pure tantalum or niobium powder in almost quantitative yield. The powder is specially suited for use as electrolytic capacitor anodes. The powder is improved by passage through a plasma of an inert gas.
The process can be performed on a continuous scale.
REFERENCES:
patent: 2994603 (1961-08-01), Greenberg et al.
patent: 3012877 (1961-12-01), Foos et al.
patent: 3110585 (1963-11-01), Scheller et al.
patent: 3736132 (1973-05-01), Morse et al.
patent: 3784369 (1974-01-01), Suanstrom
patent: 3976435 (1974-08-01), Klein
patent: 4009007 (1977-02-01), Fry
patent: 4017302 (1977-04-01), Bates et al.
Behrens Dieter
Hahn Reinhard
Hermann C. Starck Berlin
Lewis Michael L.
Rutledge L. Dewayne
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