Process for producing a tough cermet
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-gorup metal. This tough cermet has a three phase grain microstructure and is made is mixing titanium carbonitride powder and up to 70 weight % of the total amount of the tungsten carbide fine powder. The resulting mixture is melted to form a solid solution, pulverized, mixed with the remaining amount of tungsten carbide fine powder, and sintered at temperatures of 1325.degree.-1650.degree. C.
Claims2
A process for producing a tough cermet having a three-phase grain microstructure consisting of a core phase rich in titanium carbonitride, an intermediate phase rich in tungsten carbide surrounding said core phase, and an outer phase of a (titanium, tungsten) carbonitride solid solution surrounding said intermediate phase, the tough cermet including from 20-92% by weight of titanium carbonitride powder, 5-50% by weight of tungsten carbide fine powder and 3-30% by weight of metal powder in the iron group, the process comprising the steps of:
- (a) uniformly mixing the titanium carbonitride powder and up to 70% by weight of the total amount of the tungsten carbide fine powder,
- (b) melting the resulting mixture to form a solid solution of (titanium, tungsten) carbonitride,
- (c) pulverizing said solid solution,
- (d) uniformly mixing the resulting (titanium, tungsten) carbonitride powder with the remaining amount of tungsten carbide fine powder, and
- (e) sintering the mixture at temperatures of 1325.degree.-1650.degree. C.
Dependencies are inferred from the claim text.