| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface-coated cutting tool in which a hard coating layer exhibits superior pitching resistance and wear resistance while cutting a workpiece with high weldability at high speeds. SOLUTION: On the surface of a tool base made of a tungsten carbide-based sintered alloy or a titanium carbonitride based-thermet, (a) A compound nitride layer of Al and Cr in which Al maximally-containing points and Cr maximally-containing points are alternately and repeatedly present at predetermined intervals are vapor-deposited as a lower layer along the layer thickness direction, and (b) A compound nitride layer of Al and Cr of composition tilt type which has an average composition satisfying the requirements of 0.2≤X≤0.4, 0.5≤Y≤1(X, Y are atomic ratios) in the composition formula: (Al<SB>1-X</SB>-Cr<SB>X</SB>)N<SB>Y</SB>and in which a Y value on the surface of an upper layer satisfies the requirement of 0≤Y≤0.35 is vapor-deposited as the upper layer. COPYRIGHT: (C)2009,JPO&INPIT
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