| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface-coated cemented-carbide cutting tool with a hard coating layer showing excellent chipping resistance in cutting a difficult-to-cut material. SOLUTION: The surface-coated cemented-carbide cutting tool has the hard coating layer on the surface of a cemented carbide base body composed of tungsten-carbide-based cemented carbide alloy or titanium-carbonitride-based cermet. The hard coating layer is composed of (a) a lower layer which has a mean layer thickness of 1 to 5μm, and is composed of a (Ti, Al, Si)N layer satisfying the following composition formula, (Ti<SB>1-(X+Y)</SB>Al<SB>X</SB>Si<SB>Y</SB>)N, where X is 0.30 to 0.70, and Y is 0.01 to 0.10 in a atomic ratio; (b) an interlayer adhesive layer composed of a vanadium nitride layer having a mean layer thickness of 0.1 to 1.5μm; and (c) an upper layer which has a mean layer thickness of 1 to 5μm, and is composed of a V diffused VO<SB>M</SB>layer having a texture in which a metal V of 0.5 to 7 atm.% in a ratio occupied in the total amount including VO<SB>M</SB>is dispersively distributed in a matrix of VO<SB>M</SB>(vanadium oxide). COPYRIGHT: (C)2007,JPO&INPIT
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