Hitachi Tool Engineering, Ltd.

Syuuhou Koseki

Kenichi Inoue

Kazuyuki Kubota

Yuuzoh Fukunaga

A hard-coated tool comprising a titanium carbonitride layer formed directly on a WC-based cemented carbide substrate by a chemical vapor deposition method; the titanium carbonitride layer having a composition comprising 74-81% by mass of titanium, 13-16% by mass of carbon and 6-10% by mass of nitrogen; the titanium carbonitride layer having a structure comprising columnar crystal grains having an average transverse cross section diameter of 0.01-0.22 &#x3bc;m; a layer of W diffused from the substrate to the titanium carbonitride layer having an average thickness of 30-200 nm; and the titanium carbonitride layer having an X-ray diffraction peak of a (422) plane in a 2&#x3b8; range of 122.7-123.7&#xb0;.

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Matsue, Japan

Syuuhou Koseki