| 摘要 |
The present invention provides a surface-coated cutting tool in which a hard coating layer demonstrates excellent chipping resistance in high-speed intermittent machining. The surface-coated cutting tool comprises a lower layer composed of a Ti compound layer and an upper layer composed of a columnar crystal Zr-containing alpha-Al2O3 layer which are formed by vapor deposition. A surface layer of the lower layer is composed of a TiCN layer with a layer thickness of more than 500 nm. Oxygen is only exited in a depth region up to 500 nm in a thickness direction of the TiCN layer, and has an average content of 0.5-3 atom%. The horizontal average diameter of Zr-containing alpha-Al2O3 particles right above the lower layer is 0.1-0.3 [mu]m, and the horizontal average diameter of Zr-containing alpha-Al2O3 particles right above the upper layer is 0.5-1.0 [mu]m. For Zr-containing alpha-Al2O3 particles of the whole upper layer, the Zr-containing alpha-Al2O3 particles which a tilt angle formed by the normal of a plane (0001) and a normal of the surface of a tool substrate being 0-10 degrees account for 45 area%, and in the area where the film thickness from an interface to the upper layer is less than 1 [mu]m, the orientation of the plane (0001) is less than 10%, and the orientation of (02-21) is more than 30%. |
