C - Chemistry – Metallurgy – 04 – B
Patent
C - Chemistry, Metallurgy
04
B
C04B 35/00 (2006.01) C22C 29/00 (2006.01) C22C 29/06 (2006.01)
Patent
CA 2049636
89-3-643 CERAMIC-METAL ARTICLES AND METHODS OF MANUFACTURE ABSTRACT A dense cermet article includiny about 80-95% by volume of a granular hard phase and about 5-20% by volume of a metal phase. The hard phase is a carbide, nitride, carbonitride, oxycarbide, oxynitride, or carboxynitride of a cubic solid solution selected from W-Ti, W-Hf, W-Nb, W-Ta, Zr-Ti, Hf-Ti, Hf-Zr, V-Ti, Nb-Ti, Ta-Ti, or Mo-Ti. The metal phase consists essentially of a combination of nickel and aluminum having a ratio of nickel to aluminum of from about 90:10 to about 70:30 by weight, and 0-5% by weight of an additive selected from titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, tungsten, cobalt, boron, and/or carbon. The article may be produced by presintering the hard phase - metal phase component mixture in a vacuum or inert atmosphere at about 1475° 1675°C, then densifying by hot isostatic pressing at a temperature of about 1575°-1675°C, in an inert atmosphere, and at about 34-207 MPa pressure. Limiting the presintering temperature to 1475°-1575°C and keeping the presintering temperature at least 50°C below the hot pressing temperature produces an article of gradated hardness, harder at the surface than at the core. In this gradated product, the hard phase may alternatively be a carbide, nitride, carbonitride, oxycarbide, oxynitride, carboxynitride, or boride of an element selected from Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, or B.
Buljan Sergej T.
Lingertat Helmut
Wayne Steven F.
Gte Laboratories Incorporated
Gte Valenite Corporation
R. William Wray & Associates
Valenite Inc.
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