| 摘要 |
PROBLEM TO BE SOLVED: To provide a coated cutting tool, which is optimum for high speed cutting, by improving the abrasion resistance of a film including Si substantially and improving the adhesion of the Si inclusion film without sacrificing its high hardness and oxidation resistance. SOLUTION: In the coated cutting tool comprising an Si inclusion film including one kind or two or more kinds of elements selected from metal components of 4a, 5a and 6a groups and Al as a metal component and elements which include Si and are selected from one kind and two or more kinds of N, B, C and O as a non-metal component, and a hard film including one kind or two ore more kinds of elements selected from Ti, Al and Cr as a metal component and elements selected from one kind or two or more kinds of at least N, B, C and O as a non-metal component, coated in a state of at least two layers, the hard layer including Si comprises a composition segregation polycrystal material including crystal particles whose Si inclusion density is relatively high and low.
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