| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a surface coated cutting tool with a hard coating layer exerting excellent chipping resistance and wear resistance in heavy cutting work of a material to be cut having high welding performance. Ž<P>SOLUTION: On a surface of a tool base comprising tungsten carbide group cemented carbide or titanium carbon nitride group cermet, a complex nitride layer of Al, Ti, and Si represented by a composition formula: (Al<SB>α</SB>Ti<SB>1-(α+β)</SB>Si<SB>β</SB>)N (wherein 0.50≤α≤0.65, 0.01≤β≤0.10 in an atomic ratio) is formed as (a) a lower layer by vapor deposition, a complex oxide layer of Al and Si represented by a composition formula: (Al<SB>1-Y</SB>Si<SB>Y</SB>)<SB>2</SB>O<SB>3</SB>(wherein 0.01≤Y≤0.3 in an atomic ratio) is formed as (b) an intermediate layer by the vapor deposition, a composition tilting type complex oxide layer of Al and Si represented by a composition formula: (Al<SB>1-Y</SB>Si<SB>Y</SB>)<SB>1-X</SB>O<SB>X</SB>(wherein 0≤X≤0.1, 0.01≤Y≤0.3 in an atomic ratio) is formed as (c) a upper layer by the vapor deposition, wherein an O (oxygen) content proportion of the upper layer reduces from the intermediate layer side toward the upper layer surface. Ž<P>COPYRIGHT: (C)2010,JPO&INPIT Ž
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