Method for preparing dense tungsten ingots

Details Method for preparing dense tungsten ingots Method for preparing dense tungsten ingots

1990-04-30

1990-11-20

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Powder shape or size characteristics

419 26, 419 39, 419 49, 419 68, 75248, B22F 100

Patent

active

049717570

ABSTRACT:
Dense tungsten ingots are prepared by hot isostatically pressing at a temperature of about 1500.degree. to about 1700.degree. C. and a pressure of about 20 to about 30 ksi for about 2 to about 3 hours a refractory container comprising a green tungsten metal compact in contact with a dopant, the tungsten metal of the compact being formed prior to contact with the dopant; the dopant being a material which is insoluble in tungsten and contains molecules having atomic radii greater than the atomic radius of tungsten by at least about 15%.

REFERENCES:
patent: 4458599 (1984-07-01), Mullendose et al.
patent: 4801330 (1989-01-01), Bose et al.
"Cold Isostatic Pressing of Metal Powders", Metals Handbook, 9th Edition, vol. 7, pp. 444-450.
Application Ser. No. 364,388, filed Jun. 12, 1989.
Kirk-Othmer, Encyclopedia of Chemical Technology, Third Edition, vol. 20, pp. 38-64.
Metals Handbook, 9th Edition, vol. 7, p. 6.
Metals Handbook, "Hot Isostatic Pressing of Metal Powders", 9th Edition, vol. 7, pp. 419-443.

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