Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1990-07-27
1991-01-01
Lechert, Jr., Stephen J.
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
419 23, 419 28, 419 31, 419 33, 419 35, 419 38, 419 49, 419 51, B22F 900
Patent
active
049815121
ABSTRACT:
A composite material comprising a metal matrix containing tungsten grain is roduced from tungsten powders formed by plasma rapid solidification. The powders comprise tungsten and up to 20 weight percent of a metal selected from the group consisting of molybdenum, tantalum, niobium, rhenium, and chromium. The surfaces of the powders are cleaned to reduce the surface oxide thereon, and the powders are coated with at least one metal selected from the group consisting of copper, nickel, cobalt, hafnium and tantalum. The coated powders are formed into a sintered preform which is less than fully dense, and the sintered preform is further consolidated to full density by a technique selected from hot isostatic pressing, rapid omin-directional compaction, and hot extrusion.
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patent: 4332617 (1982-01-01), Hovis, Jr. et al.
patent: 4793969 (1988-12-01), Johnson et al.
patent: 4885028 (1989-12-01), Kopatz et al.
Bhat N.
Costigan Edward F.
Gibson Robert P.
Goldberg Edward
Lechert Jr. Stephen J.
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