硬質被覆層がすぐれた耐チッピング性を発揮する表面被覆切削工具

Japanese Patent JP7063206

B2

To provide a surface-coated cutting tool having a hard coating layer exerting excellent chipping resistance.SOLUTION: A surface-coated cutting tool is produced by alternately laminating TiAlCN layer α and TiAlCN layer β. In the TiAlCN layer α: (TiAl)(CN), the average content ratio of Al: Xαand that of C: Yαsatisfy 0.60≤Xα≤0.95 and 0≤Yα≤0.005, respectively. In the TiAlCN layer β: (TiAl)(CN), the minimum value of Al content ratio: Xβ, the maximum value of Al content ratio: Xβand the average content ratio of C: Yβsatisfy 0≤Xβ<(Xα-0.15), Xβ<(Xα+0.15) and 0≤Yβ≤0.005, respectively. The average layer thickness Lα of the TiAlCN layer α and that Lβ of the layer β satisfy 0.2 μm