| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface-coated cutting tool which exhibits superior chipping resistance and wear resistance according to high-speed intermittent cutting processing.SOLUTION: A hard coating layer contains at least a composite nitride or composite carbonitride layer of Ti and Al, when expressing the layer as (TiAl)(CN), a content proportion of Al Xand a content proportion of C Y(either of x, y is atomic ratio) satisfy 0.60≤X≤0.95, 0≤Y≤0.005, the layer contains chlorine of average content 0.1 to 0.5 atom %, the layer has a columnar structure made of crystal grains having a cubic crystal structure of which an average particle width W is 0.1 to 2 μm and an average aspect ratio A is 2 to 10, on a grain boundary part of the columnar structure, fine particle crystal grains having a hexagonal structure of an average particle size R of 0.01 to 0.3 μm exist, and regarding the peak intensity ratio of chlorine with respect to Al, the ratio Ih/Ic of peak intensity ratio Ih of the fine particle crystal grain having the hexagonal structure to peak intensity ratio Ic of the crystal grain having the cubic crystal structure is larger than 5.SELECTED DRAWING: Figure 1 |
