Patent ID: 10456842

Abstract:
A surface-coated cutting tool has a hard coating layer on a tool body. The hard coating layer includes a (Ti1−xAlx)(CyN1−y) layer (the average amount Xavg of Al and the average amount Yavg of C satisfy 0.60≤Xavg≤0.95 and 0≤Yavg≤0.005). Crystal grains having an NaCl type face-centered cubic structure in the layer have {111} orientation, a columnar structure in which the average grain width of the individual crystal grains having an NaCl type face-centered cubic structure is 0.1 μm to 2.0 μm and the average aspect ratio is 2 to 10 is included, and in the individual crystal grains having an NaCl type face-centered cubic structure, a periodic compositional variation in Ti and Al in the composition formula: (Ti1−xAlx)(CyN1−y) is present and the difference between the average of maximum values of x and the average of minimum values thereof is 0.03 to 0.25.