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|1. (WO2018100849) SURFACE-COATED CUTTING TOOL|
|Applicants:||SUMITOMO ELECTRIC HARDMETAL CORP.
|Title:||SURFACE-COATED CUTTING TOOL|
A surface-coated cutting tool which is provided with a base material and a coating film that covers the surface of the base material. The coating film comprises a super-multilayer structure layer in which layers A and layers B having a composition different from that of the layers A are alternately laminated from the base material side toward the surface side. The super-multilayer structure layer has a configuration wherein regions X, in which layers A having a thickness of AX and layers B having a thickness of BX are alternately laminated, and regions Y, in which layers A having a thickness of AY and layers B having a thickness of BY are alternately laminated, are alternately repeated from the base material side toward the surface side. The thickness AX of the layers A is larger than the thickness AY of the layers A; and the thickness BX of the layers B is smaller than the thickness BY of the layers B. The layers A and the layers B have a composition that is composed of one or more elements selected from the group consisting of Ti, Al, Cr, Si, Ta, Nb and W and one or more elements selected from the group consisting of C and N.