Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Metal and nonmetal in final product
Patent
1990-12-21
1991-08-20
Stoll, Robert L.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Metal and nonmetal in final product
419 10, 419 13, 419 14, 419 15, 419 16, 419 17, 419 18, 419 38, 419 44, 419 49, 419 53, 419 56, 419 60, 75232, 75233, 75234, 75235, 75236, 75237, 75238, 75240, 75241, 75239, 75242, 75244, B22F 100
Patent
active
050412612
ABSTRACT:
A method for manufacturing a dense cermet article including about 80-95% by volume of a granular hard phase and about 5-20% by volume of a metal binder phase. The hard phase is (a) the hard refractory carbides, nitrides, carbonitrides, oxycarbides, oxynitrides, carboxynitrides, borides, and mixtures thereof of the elements selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, and B, or (b) the hard refractory carbides, nitrides, carbonitrides, oxycarbides, oxynitrides, and carboxynitrides, and mixtures thereof of a cubic solid solution of Zr--Ti, Hf--Ti, Hf--Zr, V--Ti, Nb--Ti, Ta--Ti, Mo--Ti, W--Ti, W--Hf, W--Nb, or W--Ta. The binder phase is a combination of Ni and Al having a Ni:Al weight ratio of from about 85:15 to about 88:12, and 0-5% by weight of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Co, B, and/or C. The method involves presintering the hard phase/binder phase mixture in a vacuum or inert atmosphere at about 1475.degree.-1675.degree. C., then HIPing at about 1575.degree.-1675.degree. C., in an inert atmosphere, and at about 34-207 MPa pressure. Limiting the presintering temperature to 1475.degree.-1575.degree. C. and keeping the presintering temperature at least 50.degree. C. below the hot pressing temperature, produces an article of gradated hardness, harder at the surface than at the core.
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Buljan Sergej T.
Lingertat Helmut
Wayne Steven F.
Craig Frances P.
GTE Laboratories Incorporated
Nigohosian, Jr. Leon
Stoll Robert L.
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