| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface-coated cutting tool having a hard coating layer with excellent chipping resistance in heavy cutting a difficult-to-cut material. SOLUTION: In this surface-coated cutting tool, a hard coating layer comprising (a) a bottom layer having average layer thickness of 1-5μm, and made of a composite nitride layer of Ti, Al and Si satisfying a composition formula:(Ti<SB>1-X-y</SB>Al<SB>X</SB>Si<SB>Y</SB>)N (where X denotes 0.30-0.70 and Y denotes 0.01-0.10 in an atomic ratio), and (b) a top layer made of an alternating laminate structure of vanadium nitride layers and vanadium oxide layers having average layer thickness of 0.4-2μm, having vanadium oxynitride layers with average layer thickness of 0.02-0.2μm between the respective layers, and having overall average layer thickness of 1-5μm, is formed on a surface of a tool base made of a tungsten carbide base cemented carbide or a titanium nitride base cermet. COPYRIGHT: (C)2008,JPO&INPIT
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