| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface coated cutting tool in which a hard coating layer exhibits excellent adhesion, lubricity and wear resistance under high-speed heavy cutting conditions of high hardness steel. SOLUTION: The surface coated cutting tool has, as the hard coating layer, a layer comprising an alternately stacked structure formed on a surface of a tool base made of a WC-based cemented carbide or a TiCN-based cermet, wherein the hard coating layer has a mixed structure of a thin layer A comprising an (AlCr)N layer or an (AlCrM)N layer and a thin layer B comprising NbN of a cubic structure and NbN of a hexagonal structure, and the mixed structure has a diffraction peak intensity ratio satisfying 0.05≤Ic/Ih≤1.0, where diffraction peak intensity from a (200) plane of the NbN of the cubic structure is Ic and diffraction peak intensity from a (103) plane and a (110) plane of NbN of the hexagonal structure is Ih, when the diffraction peak intensity by X-ray diffraction is inspected for the mixed structure. COPYRIGHT: (C)2011,JPO&INPIT
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