| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface coated cutting tool having a hard coating layer exerting excellent lubricity and wear resistance in high speed cutting of a material to be cut with high weldability. SOLUTION: In this surface coated cutting tool, the hard coating layer having layer thickness of 0.8-5μm is formed by deposition on a surface of a tool base body. In the tool, a compound nitride dispersed particle phase of Al, Cr and B rich in B having a composition of (Al<SB>a</SB>Cr<SB>1-a</SB>B<SB>b</SB>)N<SB>c</SB>(0.4≤a≤0.7, 1≤b≤2.5, 0.25≤c≤0.68) is made to exist on a hard coating layer basis material constituted of a AlCrBN phase having a composition of (Al<SB>X</SB>Cr<SB>1-X</SB>B<SB>Y</SB>)N<SB>Z</SB>(0.5≤X≤0.7, 0.001≤Y≤0.1, 0.9≤Z≤1.25, X+Y<0.75). The whole average composition of the hard coating layer is taken as (Al<SB>α</SB>Cr<SB>1-α</SB>B<SB>β</SB>)N<SB>γ</SB>(0.5≤α≤0.7, 0.003≤β≤0.12, 0.8≤γ≤1.25). COPYRIGHT: (C)2009,JPO&INPIT
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