Manufacture of transition metal carbide, nitride, and carbonitride whiskers containing two or more transition metals

US5851285A · kind A · utility

Assignee

• SANDVIK AB · SE

Inventors

• Mats Johnsson · Lund, SE
• Niklas Ahlen · Söderbärke, SE
• Mats Nygren · Bromma, SE
• Magnus Ekelund · Haditha, IQ
• Gunnar Brandt · Solna, SE

Key dates

• Filing date: Dec 20, 1996
• Grant date: Dec 22, 1998
• Expiry date: Dec 20, 2016

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S977/90
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

There is disclosed a method of producing whiskers in large volumes and at low cost to be used as reinforcing material. The whiskers are solid solutions between two or more transition metal carbides, nitrides and carbonitrides, (Me.sub.1-X-Y.sub.Me'.sub.X+Y)C.sub.1-Z N.sub.Z, having preferably submicron diameters, where Me' is one or more transition metals other than Me. 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 volatilization agent for the transition metals and a catalyst 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, carbonizing or carbonitriding heat treatments in order to produce the desired whiskers.