Patent ID: 9199311
Filing Date: 2015-12-01
Classification: B23B,C23C,Y10T

Abstract:
1. A coated cutting tool comprising a cemented carbide substrate and a coating formed on a surface of the substrate by a chemical vapor deposition method, wherein an average thickness of the coating is 3 to 20 μm, the coating comprises a lower film having an average thickness of 2 to 15 μm formed on the surface of the substrate, and an upper film having an average thickness of 1 to 10 μm formed on a surface of the lower film on a side opposite to a surface in contact with the substrate, the lower film has an alternately laminated film in which a TiN film having an average thickness of 10 to 300 nm and a TiCN film having an average thickness of 0.1 to 0.5 μm are alternately laminated, wherein a number of laminated layers of the TiN film and the TiCN film in the alternately laminated film is 4 to 120 total layers and a hardness of the alternately laminated film is 28 GPa to 40 GPa, and the upper film has an aluminum oxide film.