Surface coated carbo-nitride titanium-base cermet material for inserts of high-speed cutting tools

摘要

A surface coated TiCN-base cermet material for inserts of cutting tools, which possesses excellent wear resistance as well as excellent chipping resistance and therefore can exhibit excellent cutting performance over a long period of use when used as a cutting insert in high speed cutting of steel or the like. The cermet material consists essentially of a substrate or a TiCN-base cermet, and a hard surface layer formed over surfaces of the substrate, the hard surface layer being formed of a single layer of one compound selected from the group consisting of TiC, TiN, and TiCN, or a composite layer of at least two compounds selected from the same group, the hard surface layer having a mean thickness within a range from 0.5 to 10 micrometers. The hard surface layer has a mean grain size of not more than 0.05 micrometers.