Process for producing tantalum and columbium powder

Details Process for producing tantalum and columbium powder Process for producing tantalum and columbium powder

1978-06-06

1979-04-17

Stallard, W.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 844, B22F 900

Patent

active

041498763

ABSTRACT:
A method of producing tantalum or columbium powder is described for producing a selected desired particle size powder under controlled conditions with a high rate of production and yield of usable powder. A molten salt bath of an alkali metal tantalum fluoride or an alkali metal columbium fluoride and a relatively large amount of diluent salt to act as a heat sink is initially maintained at a low temperature in the liquidus range, an addition of liquid alkali metal reducing metal is added at a very fast rate to the continuously stirred bath to create a rapid temperature rise to the reaction temperature, and liquid alkali metal is thereafter fed at a fast rate to complete the reaction quickly at the final reaction temperature. Cooling is used for at least a portion of the reaction cycle at a rate sufficient to maintain the final reaction temperature within a desired range.

REFERENCES:
patent: 2950185 (1960-08-01), Hellier et al.
patent: 3829310 (1974-08-01), Mahy
patent: 3992192 (1976-11-01), Vartanian
patent: 4067736 (1978-01-01), Vartanian

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