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Manufacture of transition metal carbide, nitride and carbonitride whiskers containing two or more transition metals
Manufacture of transition metal carbide, nitride and carbonitride whiskers containing two or more transition metals
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机译:制造包含两种或多种过渡金属的过渡金属碳化物,氮化物和碳氮化物晶须
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摘要
The present invention relates to a method of producing whiskers in large volumes and at low cost to be used as reinforcing material. The whiskers consist of solid solutions between two or more transition metal carbides, nitrides and carbonitrides, (Me1-X-YMe'XMe''Y..etc.)C1-ZNZ, having preferably submicron diameters. The whiskers are suitable for use as a reinforcement material in a wide range of materials, including metals, intermetallics, plastics, ceramics and metallic bonded hard material. Transition metal oxides, hydroxides or alkali compounds thereof are mixed with carbon powder. The carbon source is added in an amount to satisfy the stoichiometric requirements of the carbide or nitride. A halogenide salt is used as a volatilisation agent for the transition metals and a cataIyst such as Ni or Co that is able to dissolve transition metals plus C and/or N. The reactant powders are blended so as to intimately mix them. Finally, the mixed starting material is subjected to nitriding, carbonising or carbo-nitriding heat treatments in order to produce the desired whiskers. IMAGE
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