Surface coating cutting tool with excellent wear resistance and peeling resistance for the hard coating layer

摘要

To provide a surface-coated cutting tool having a hard coating layer exerting excellent wear resistance and peeling resistance.SOLUTION: The surface-coated cutting tool is provided in which a hard coating layer is formed on the surface of a tool base made of a tungsten carbide-based cemented carbide or a titanium carbonitride-based cermet, (a) the hard coating layer has a lower layer and an upper layer in order from the surface side of the tool base; (b) the lower layer has a Ti compound layer comprising one or two or more layers of a carbide layer, nitride layer, carbonitride layer, carboxide layer, oxycarbonitride layer and having a total average layer thickness of 0.1-3.0 μm; (c) the upper layer has a Zr boride layer having an average layer thickness of 1.0-15.0 μm; (d) a longitudinal columnar crystal grain whose aspect ratio is 3 or more has a 80% or more of longitudinal columnar crystal composition in an area ratio in the longitudinal section of the upper layer; and (e) the upper layer has on a (100) plane, a maximum peak by an X-ray diffraction, and an orientational index Tc(hkl) of the upper layer satisfies Tc(100)≥2.0A.SELECTED DRAWING: Figure 1