Asahi Glass Company, Limited

Makoto Imakawa

Kazuo Hamashima

Yasuo Shinozaki

Noritoshi Horie

Yukinori Kutsukake

A complex boride cermet having high strength and high toughness, which comprises a hard phase composed mainly of a boride of (Mo.sub.1-x W.sub.x).sub.2 NiB.sub.2 formed by substituting a part of Mo of Mo.sub.2 NiB.sub.2 by W, and a matrix alloy phase composed mainly of Ni and containing Mo, and a complex boride cermet comprising a hard phase composed mainly of Mo.sub.2 NiB.sub.2 or (Mo.sub.1-x W.sub.x).sub.2 NiB.sub.2 and a matrix of an alloy phase composed mainly of Ni and containing Mo, which is characterized in that carbon or/and nitrogen, and optionally at least one metal selected from the metals of Groups 4B and 5B and Cr, are incorporated to further improve the strength and toughness. Such complex boride cermet has high strength and high toughness and maintains such properties even at elevated temperatures of from 600.degree. to 900.degree. C. Also disclosed is a process for producing a complex boride cermet containing carbon or/and nitrogen, and optionally at least a carbide or/and a nitride of a metal selected from the metals of Groups 4B, 5B and 6B are added to the starting material.

Complex boride cermets and processes for their production

A ZrB.sub.2 -containing sintered cermet comprising zirconium diboride partially substituted by at least one member selected from the group consisting of chromium boride, molybdenum boride and tungsten boride, and a binding component containing at least one member selected from the group consisting of metals of Group VIII of the periodic table.

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Yokohama, Japan

Makoto Imakawa