| 摘要 |
PROBLEM TO BE SOLVED: To provide a surface coated cutting tool whose hard coating layer exhibits excellent chipping resistance and wear resistance in high-speed intermittent cutting of alloy tool steel or the like.SOLUTION: A surface coated cutting tool has a hard coating layer comprising (a), (b) and (c) formed by chemical vapor deposition on a surface of a tool base body, where (a) is a lower layer made of a Ti compound layer having a total average layer thickness of 3-20 μm, (b) is an intermediate layer made of an aluminum oxide layer having an average layer thickness of 1-15 μm, and (c) is an upper layer made of a modified Ti carbonitride layer having a vertically-long grown crystalline structure with an average layer thickness of 4-14 μm. (d) In the modified Ti carbonitride layer constituting the upper layer, at least one Al-containing region observed as a plurality of peaks of Al contents is found at an interval within a range of a depth of 0.5-3.5 μm from a surface toward an inner part along a layer thickness direction, and an average Al content in the Al-containing region is 2.0-4.5 atom%. |
