Surface-Coated Cutting Tool

摘要

The present invention is directed to a surface-coated cutting tool including a substrate and a coating layer formed on the substrate. The coating layer includes a first coating layer composed of titanium boronitride or titanium boron-oxynitride and a second coating layer formed from at least one selected from the group consisting of aluminum oxide, zirconium oxide, hafnium oxide and a solid solution mainly including two or more of these components. The first coating layer is located directly under the second coating layer, between the substrate and the second coating layer. The second coating layer has compressive stress at least in an area involved with cutting.