| 摘要 |
The presently claimed invention relates to a method of producing, in large volumes and at low cost, titanium carbide, nitride and carbonitride whiskers, with preferably submicron diameters, to be used as reinforcing material. 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. Titanium oxide, hydroxide or alkali compounds thereof are mixed with the carbon powder. The basic idea of the invention is the use of a carbon source with a volatile part which volatiles at temperatures exceeding 500 DEG C and in an amount to satisfy the stoichiometric requirements of the carbide or nitride and use a halogenide salt as a volatilisation agent for titanium and a catalyst able to dissolve Ti plus C and/or N, such as Ni or Co. The reactant powders are blended in some typical manner e.g. by using a high speed blender 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> |
