Manufacture of transition metal carbide, nitride and carbonitrid

Details Manufacture of transition metal carbide, nitride and carbonitrid Manufacture of transition metal carbide, nitride and carbonitrid

1996-12-20

1998-12-29

Garrett, Felisa

Single-crystal, oriented-crystal, and epitaxy growth processes;

Forming from vapor or gaseous state

Forming a platelet shape or a small diameter, elongate,...

117 75, 117921, 117954, C30B 2662

Patent

active

058534776

ABSTRACT:
There is disclosed a method of producing, in large volumes and at low cost, Ta, Nb, Zr and Hf carbide, nitride or carbonitride whiskers, preferably submicron, having excellent reinforcing properties, suitable as reinforcement in a wide range of materials, including metals, intermetallics, plastics, ceramics and metallic bonded hard material. Oxides of Ta, Nb, Zr and Hf or alkali compounds thereof in an amount to satisfy the stoichiometric requirements of the desired carbide or nitride are mixed with the carbon source along with an alkali and/or alkali earth metal halogenide as a volatilization agent for the metal and a catalyst for the whisker growth such as Ni and/or Co. The reactant powders are blended in some typical manner using a high speed blender so as to intimately mix them. Finally, the starting material is subjected to nitriding, carbonizing or carbonitriding heat treatments in order to produce the desired whiskers.

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