Patent ID: 8354177
Filing Date: 2013-01-15
Classification: B23F,C23C,Y10T

Abstract:
1. A surface-coated cutting tool comprising a hard coating layer formed on a surface of a tool substrate, the hard coating layer is composed of an alternately laminated layer structure of at least a thin layer A and a thin layer B, in which the thin layer A has a thickness of 0.01 to 0.1 μm, the thin layer B has a thickness of 0.01 to 0.1 μm, and a total thickness of the thin layers A and B is within 1 to 10 μm: (a) the thin layer A is a complex nitride layer of Al, Cr and Si, and when expressing a composition of the complex nitride layer as a compositional formula [Al (where all of X, Y, and Z are atomic ratios); and (b) the thin layer B is a complex nitride layer of Al, Ti, and Si, and when expressing a composition of the complex nitride layer as a compositional formula [Al (where all of U, V, and W are atomic ratios), wherein the hard coating layer includes: an upper layer composed of an alternately laminated layer structure of the thin layer A and the thin layer B, and an under layer formed so as to be interposed between the upper layer and the surface of the tool substrate; and the under layer has a composition which satisfies the compositional formula of the thin layer A.