Process for preparing metals from their fluorine-containing comp

Details Process for preparing metals from their fluorine-containing comp Process for preparing metals from their fluorine-containing comp

1981-11-10

1983-08-09

Stallard, W.

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 05AA, 75 05AB, 75 05BA, 75 05BB, B22F 926

Patent

active

043976824

ABSTRACT:
A process for preparing high purity superfine powders of less than 0.5.mu. diameter of Mo, W, Nb, Zr, Cu, Zn, Co, Ni and In by first producing their fluoride or a double fluoride with ammonium and then decomposing them under heat in a hydrogen-containing stream. Features of the present process are that the double fluoride of the metals with ammonium is faster in crystal growth than their fluoride, recrystallization of these salts can be repeated as desired when a high purity of the metals is required, and particles of a uniform size can be obtained easier.

REFERENCES:
patent: 3234007 (1966-02-01), Blocher, Jr. et al.
patent: 3341320 (1967-09-01), Smiley
patent: 3480426 (1969-11-01), Neuenschwander
patent: 3539335 (1970-11-01), Svanstrom
patent: 3630718 (1971-12-01), Neuenschwander

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