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|1. (WO2018105403) SURFACE COATED CUTTING TOOL|
|Applicants:||SUMITOMO ELECTRIC HARDMETAL CORP.
SUMITOMO ELECTRIC INDUSTRIES, LTD.
|Title:||SURFACE COATED CUTTING TOOL|
A surface coated cutting tool comprises a base material made of a cemented carbide and a coating. The coating includes an intermediate layer in contact with the base material, and an upper layer formed on the intermediate layer. The upper layer is a single layer comprising an upper basal layer that is a layer in contact with the intermediate layer or a multilayer of two or more layers including the upper basal layer. The crystal system of the base material is a hexagonal crystal system. The intermediate layer and the upper basal layer have a NaCl-type crystal structure. The thickness of the intermediate layer is 3 nm to 10 nm, inclusive. The interplanar spacing mismatch in the boundary region of the base material and the intermediate layer is 65% or less than the theoretical value of the interplanar spacing mismatch between the base material and the upper basal layer. The interplanar spacing mismatch in the boundary region of the intermediate layer and the upper basal layer is 65% or less than the theoretical value of the interplanar spacing mismatch between the base material and the upper basal layer.