| 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 of high hardness steel. SOLUTION: The cutting tool made of surface coated cemented carbide comprises the hard coating layer formed on the surface of a carbide substrate formed of tungsten carbide based cemented carbide or titanium carbonitride based cermet. The hard coating layer consists of: (a) a lower layer formed of a compound nitride layer of Ti, Al and B (boron) having an average layer thickness of 0.8-5μm and satisfying a composition formula: (Ti<SB>1-(X+Z)</SB>Al<SB>X</SB>B<SB>Z</SB>)N, wherein X is 0.25-0.65, and Z is 0.01-0.10 at the atomic ratio; (b) an adhesive joint layer formed of a ZrBN (zirconium boronitride) layer having an average layer thickness of 0.1-0.5μm; and (c) an upper layer formed of a ZrB<SB>2</SB>(zirconium boride) layer having an average layer thickness of 0.8-5μm. COPYRIGHT: (C)2006,JPO&NCIPI
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