Tough cermet and process for producing the same
AssigneesHitachi Metals, Ltd., Hitachi Carbide Tools Ltd.
InventorsYusuke Iyori, Hisaaki Ida
Life of this patent
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Abstract
A tough cermet made from 20-92 weight % of TiC and/or TiCN, 5-50 weight % of WC and 3-30 weight % of an iron-group metal. This tough cermet has a three phase grain microstructure consisting of a core phase rich in TiC and/or TiCN, an intermediate phase rich in WC and surrounding the core phase, and an outer phase made of (Ti,W)C and/or (Ti,W)CN and surrounding the intermediate phase. Because of this three-phase microstructure, the cermet has high toughness without sacrificing hardness. It is prepared by using WC powder of as fine as less than 3 .mu.m, without taking the course of forming a solid solution of TiC and/or TiCN and WC and pulverizing it.
Claims9
A tough cermet comprising 20-92 weight % of titanium carbonitride, 5-50 weight % of tungsten carbide and 3-30 weight % of a metal in the iron group, said cermet having a three-phase grain microstructure consisting of a core phase rich in titanium carbonitride, an intermediate phase rich in tungsten carbide and surrounding said core phase, and an outer phase comprised of (titanium, tungsten) carbonitride and surrounding said intermediate phase.
A tough cermet comprising 20-92 weight % of titanium carbonitride, 5-50 weight % of tungsten carbide and 3-30 weight % of a metal in the iron group, up to 30 weight %, based on said cermet, of said titanium carbonitride being replaced by at least one compound selected from the group consisting of carbides, nitrides and carbonitrides of metal elements of the IVa, Va and VIa groups of the Periodic Table except for Ti and W, said cermet having a three-phase grain microstructure consisting of a core phase rich in titanium carbonitride, an intermediate phase rich in tungsten carbide and surrounding said core phase, and an outer phase surrounding said intermediate phase and comprised of (titanium, tungsten) carbonitride and including said compound.
Dependencies are inferred from the claim text.