Patent ID: 10265785

Abstract:
A surface-coated cutting tool of the present invention includes: a cutting tool body; and a hard coating layer provided on a surface of the cutting tool body, in which the hard coating layer includes a complex nitride or carbonitride layer, which is expressed by a composition formula: (Ti1-xAlx)(CyN1-y), the average content ratio Xavg of Al and the average content ratio Yavg of C in the complex nitride or carbonitride layer satisfy 0.60≤Xavg≤0.95 and 0≤Yavg≤0.005, provided that each of Xavg and Yavg is in atomic ratio, the complex nitride or carbonitride layer includes crystal grains with a cubic structure, and in the crystal grains with the cubic structure, a composition of Ti and Al is periodically changed in a direction of the normal line to the surface of the cutting tool body.