Patent ID: 9636748
Date: 2017-05-02
CPC Classifications: B23B,C23C,Y10T

Claim:
1. A surface-coated cutting tool comprising: a cutting tool body made of tungsten carbide-based cemented carbide or titanium carbonitride-based cermet; and a hard coating layer chemically vapor-deposited on a surface of the cutting tool body, wherein the hard coating layer comprises a lower layer formed on the surface of the cutting tool body and an upper layer formed on the lower layer, (a) the lower layer is a Ti compound layer, which comprises one or more layers selected from the group consisting of a Ti carbide layer, a Ti nitride layer, a Ti carbonitride layer, a Ti carboxide layer, and a Ti oxycarbonitride layer, with a total average thickness of 3 to 20 μm, (b) the upper layer is an Al (c) an area ratio occupied by hexagonal Al (d) an area ratio occupied by hexagonal Al