| 摘要 |
PROBLEM TO BE SOLVED: To provide a cutting tool of surface-coated cubic crystal boron nitride-based sintered material with a hard coating layer achieving excellent chipping resistance in high-speed heavy cutting work. SOLUTION: On the surface of a base, a hard coating layer of composite nitride of Ti, Al and Si is physically deposited in layer thickness of 0.5-10μm. In the hard coating layer, highest content points of Al and lowest content points of Al alternately exist at a prescribed interval in a layer thickness direction, and the content ratio of Ti and Al is varied from the highest content point of Al to the lowest content point of Al, and from the lowest content point of Al to the highest content point of Al in component concentration distribution structure. The highest content point of Al satisfies a formula of [Ti<SB>1-(X+Z</SB>)Al<SB>X</SB>Si<SB>Z</SB>] (X is 0.45-0.65, and Z is 0.01-0.15 by atomic ratio). The lowest content point of Al satisfies a formula of [Ti<SB>1-(Y+Z)</SB>Al<SB>Y</SB>Si<SB>Z</SB>]N (Y is 0.10-0.35, and Z is 0.01-0.15 by atomic ratio). The interval between the highest content point of Al and the lowest content point of Al adjoining each other is 0.01-0.1μm in the hard coating layer. COPYRIGHT: (C)2005,JPO&NCIPI
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