Patent ID: 9228258
Filing Date: 2016-01-05
CPC Classification: B05D,C23C,Y10T

Claim Text:
1. A hard-coated member comprising a substrate made of cemented carbide or high-speed steel, and a hard coating formed on said substrate by a chemical vapor deposition method, said hard coating comprising a titanium carbonitride layer comprising first to third layers each having a columnar crystal structure and an upper layer in this order from the side of said substrate, and an average transverse cross section diameter of columnar crystals being 0.01-0.2 μm in any of said first to third layers, wherein a peak of X-ray diffraction of a (422) plane in said titanium carbonitride layer is in a 2θ range of 122.7-124.0°, (a) in said titanium carbonitride layer, said first layer having a carbon concentration of 13-22% by mass, said second layer having a carbon concentration of 12-21% by mass, said third layer having a carbon concentration of 9-15% by mass, the carbon concentration in said second layer being lower than the carbon concentration in said first layer by 0.1% or more by mass, and the carbon concentration in said third layer being lower than the carbon concentration in said second layer by 0.5% or more by mass; (b) said upper layer being (i) a bonding layer formed on said third layer, and a hard oxide layer of Al and/or Cr formed on said bonding layer, or (ii) a hard layer formed on said third layer and comprising Ti and/or Cr, and C and/or N as indispensable elements, and at least one element selected from the group consisting of Al, Si, B, Zr and V as an optional element.