SURFACE-COATED CUTTING TOOL

摘要

A surface-coated cutting tool includes a hard coating layer vapor-deposited on a surface of a tool body, in which a composition of the hard coating layer is expressed by a composition formula of (AlxTi1-x)N(0.5≦x≦0.8), the average layer thickness of the hard coating layer is 0.5 μm to 7.0 μm, the hard coating layer is formed of crystal grains having an average grain size of 5 nm to 50 nm, the hard coating layer have a mixed structure including cubic crystal grains having a rock-salt structure, and hexagonal crystal grains having a wurtzite structure, and {200} planes of the cubic crystal grains and {11-20} planes of the hexagonal crystal grains are oriented so as to be perpendicular to the surface of the tool body.

主权项

1. A surface-coated cutting tool comprising:
a hard coating layer which is vapor-deposited on a surface of a tool body made of a sintered tungsten carbide-based cemented carbide, wherein (a) a composition of the hard coating layer is expressed by a composition formula of (AlxTi1-x)N(0.5≦x≦0.8), and an average layer thickness of the hard coating layer is 0.5 μm to 7.0 μm, (b) the hard coating layer is formed of fine crystal grains having an average grain size of 5 nm to 50 nm, (c) the fine crystal grains have a mixed structure including both cubic crystal grains having a rock-salt structure, and hexagonal crystal grains having a wurtzite structure, and (d) {200} planes of the cubic crystal grains and {11-20} planes of the hexagonal crystal grains are oriented so as to be perpendicular to the surface of the tool body.