Patent ID: 9534292
Date: 2017-01-03
CPC Classifications: C23C,Y10T

Claim:
1. A hard-coated tool having a hard coating comprising a titanium carbonitride layer formed directly on a WC-based cemented carbide substrate by a chemical vapor deposition method, (a) said 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; (b) said titanium carbonitride layer having a columnar crystal structure comprising columnar crystal grains having an average transverse cross section diameter of 0.01-0.22 μm, when observing a fractured cross section of said titanium carbonitride layer in its growing direction; (c) a layer of W diffused from said substrate to said titanium carbonitride layer having an average thickness in a range of 30-200 nm; and (d) said titanium carbonitride layer having an X-ray diffraction peak of a (422) plane in a 2θ range of 122.7-123.7°.