| 摘要 |
Provided is a surface coating cutting tool with superior defect resistance and abrasion resistance. A surface coating cutting tool having a hard coating layer coated and formed on the surface of a tool substrate by means of a physical vapor deposition method, wherein the hard coating layer is formed of a compound carbonitride layer or a compound nitride layer with an average layer thickness of 0.5 to 8.0 µm expressed by the compositional formula (Al1-x-yTixSiy)(N1-zCz), the hard coating layer contains metallic particles with an average sectional major axis of 0.05 to 0.5 µm in which 90 at% or more of the constituent elements are metallic elements, the metallic particles are dispersed and distributed in the hard coating layer at a longitudinal section area ratio of 3 to 18 %, the constituent elements contain Al of 50 at% or more among the metallic particles, and when the longitudinal sectional area ratio of a particle satisfying conditions such as the aspect ratio of the longitudinal sectional shape being 2.0 or more and the acute angle formed between the sectional major axis and the substrate surface being 45° or less is taken as A%, and when the longitudinal sectional area ratio of another particle is taken as B%, 0.3=A/(A+B).
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