Patent ID: 11964329

Abstract:
A coated cutting tool comprising: a substrate and a coating layer, wherein the coating layer includes a lower layer and an upper layer; the lower layer includes one or two or more specific Ti compound layers; the upper layer includes an α-type Al2O3 layer; an average thickness of the lower layer is 2.0 μm to 15.0 μm; an average thickness of the upper layer is 3.5 μm to 15.0 μm; in the upper layer, a ratio of a length of Σ3 grain boundaries to a total length of 100% of a total grain boundary is more than 50% and 80% or less, and a ratio of the length of Σ3 grain boundaries to a total length of 100% of CSL grain boundaries is 70% or more; and in the upper layer, a texture coefficient TC(0,0,12) of the α-type Al2O3 layer is 8.0 or more and 8.9 or less.