| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface-coated cutting tool in which a hard coating layer exhibits excellent chipping resistance and wear resistance in high-speed heavy cutting of a workpiece having high weldability. SOLUTION: The surface of a tool base body formed of a tungsten carbide-based cemented carbide or a titanium carbonitride-based cermet is provided with (a) a lower layer formed of a composite nitride layer of Al and Ti satisfying (Al<SB>1-X</SB>Ti<SB>X</SB>)N (wherein X is 0.3≤X≤0.7 at an atomic ratio), (b) an intermediate layer formed of a composite nitride layer of Al and Cr (and M) satisfying (Al<SB>1-α</SB>Cr<SB>α</SB>)N or (Al<SB>1-β-γ</SB>Cr<SB>β</SB>M<SB>γ</SB>)N (wherein M is one or more kinds of additional components selected out of periodic table group 4a, 5a, 6a elements Si, B, Y excluding Cr, andα,β,γsatisfy 0.2≤α≤0.6, 0.10≤β≤0.54, 0.01≤γ≤0.25, 0.2≤β+γ≤0.6 at atomic ratios), and (c) an upper layer formed of an alloy layer of Al and Cr (and M). COPYRIGHT: (C)2009,JPO&INPIT
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