| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface-coated cemented carbide cutting tool having a hard coating layer exhibiting superior chipping resistance under a high speed double cutting condition. SOLUTION: This surface-coated cemented carbide cutting tool is formed by physically depositing the hard coating layer composed of a composite nitride layer of Ti, Si, and Zr in the average layer thickness of 0.5 to 15μm on a surface of a tungsten carbide group cemented carbide base body or a titanium carbonitride type cermet base body; and is constituted so that the hard coating layer has a component concentration distribution structure that an Si maximum inclusion point and an Si minimum inclusion point alternately and repeatedly exist at a prescribed interval in the layer thickness direction, and an Si inclusion rate continuously changes between both points; and is composed of the hard coating layer that the Si maximum inclusion point satisfies the composition formula : (Ti<SB>1-(X + Z)</SB>Si<SB>X</SB>Zr<SB>Z</SB>)N (here, X indicates 0.45 to 0.60, and Z indicates 0.05 to 0.15 in the atomic ratio); the Si minimum inclusion point satisfies the composition formula : (Ti<SB>1-(Y+Z)</SB>Si<SB>Y</SB>Zr<SB>Z</SB>)N (here, Y indicates 0.03 to 0.25, and Z indicates 0.05 to 0.15 in the atomic ratio); and an interval between the adjacent Si maximum inclusion point and the Si minimum inclusion point is 0.01 to 0.1μm. COPYRIGHT: (C)2005,JPO&NCIPI
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