| 摘要 |
PROBLEM TO BE SOLVED: To provide a cutting tool made of surface coated cemented carbide with a hard coating layer exhibiting excellent wear resistance in high-speed cutting. SOLUTION: The hard coating layer of the cutting tool made of the surface coated cemented carbide formed by physical vapor deposition of the hard coating layer in the average layer thickness of 0.5-15μm on the surface of a carbide substrate, comprises a compound nitride of Ti, Si and B (boron) having a component concentration distribution structure wherein Si maximum content points and Si minimum content points exist in alternate repetition at prescribed spaces along a layer thickness direction and the content rates of Ti and Si continuously change between both points, and the Si maximum content point satisfies a composition formula: [Ti<SB>1-(X+Z)</SB>Si<SB>X</SB>B<SB>Z</SB>]N, wherein X is 0.50-0.70 and Z is 0.01-0.10 at the atomic ratio, while the Si minimum content point satisfies a composition formula: [Ti<SB>1-(Y+Z)</SB>Si<SB>Y</SB>B<SB>Z</SB>]N, wherein Y is 0.03-0.30 and Z is 0.01-0.10 at the atomic ratio, and further the spacing of the adjacent Si maximum content points and Si minimum content points is 0.01-0.1μm. COPYRIGHT: (C)2005,JPO&NCIPI
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