Method for preparing tungsten materials

Details Method for preparing tungsten materials Method for preparing tungsten materials

1976-10-13

1978-07-18

Rutledge, L. Dewayne

Specialized metallurgical processes, compositions for use therei

Processes

Electrothermic processes

75 05BB, 134 3, 134 41, B22F 100, C22B 3436

Patent

active

041013093

ABSTRACT:
A method for preparing tungsten materials in which tungsten powder obtained by reducing tungsten oxides having doping agents added thereto is washed first with hydrochloric acid having a concentration of not lower than 4% by weight and then with hydrofluoric acid having a concentration of not lower than 3% by weight, and thereafter dried. The above-mentioned washing steps may be carried out at a time by using a mixture of such hydrochloric acid and hydrofluoric acid as specified above. Articles formed by treating tungsten materials obtained by the above-mentioned process are subjected to only a low high temperature deformation.

REFERENCES:
patent: 1859734 (1932-05-01), George
patent: 2829962 (1958-04-01), Supiro
patent: 3136039 (1964-06-01), Keith
patent: 3661536 (1972-05-01), Shimizu et al.
patent: 3773493 (1973-11-01), Brecher et al.
Yamamoto, H.; Journal of the Japan Society of Powder and Powder Metallurgy, vol. 19, No. 3, pp. 99-105 (1972) & translation.

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