Specialized metallurgical processes – compositions for use therei – Compositions – Consolidated metal powder compositions
Patent
1991-05-13
1993-12-21
Walsh, Donald P.
Specialized metallurgical processes, compositions for use therei
Compositions
Consolidated metal powder compositions
75235, 75237, 75241, 75245, 75249, 75950, C22C 2912
Patent
active
052717585
ABSTRACT:
A dense cermet article including about 44-93% of a granular first hard phase, about 4-44% of a granular second hard phase, and about 2-20% of a metal phase, all expressed in % by volume. The first hard phase consists essentially of alumina and from 0% to less than 5% of one or more oxides selected from magnesia, zirconia, yttria, hafnia, and silica. The second hard phase consists essentially of a hard refractory carbide, nitride, or boride, or mixture or solid solution thereof. Preferred materials for inclusion in the second hard phase are titanium carbide, hafnium carbide, tantalum carbide, tantalum nitride, tungsten carbide, titanium diboride, and boron carbide. The metal phase consists essentially of a combination of nickel and aluminum having a ratio of nickel to aluminum of from about 85:15 to about 88:12, and 0-5% of an additive selected from the group consisting of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, cobalt, boron, and/or carbon. The preferred metal phase is substantially of the Ni.sub.3 Al ordered crystal structure.
REFERENCES:
patent: 4497228 (1985-02-01), Sarin et al.
patent: 4919718 (1990-04-01), Tiegs et al.
patent: 4990181 (1991-02-01), Pierotti et al.
patent: 5015290 (1991-05-01), Tiegs et al.
patent: 5089047 (1992-02-01), Buljan et al.
Buljan Sergej T.
Lingertat Helmut
Wayne Steven F.
Jenkins Daniel
Valenite Inc.
Walsh Donald P.
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