Patent ID: 10722948

Abstract:
A coated cutting tool comprising a substrate and a coating layer formed on a surface of the substrate, the coated cutting tool having a rake surface and a flank, in which the coating layer includes an α-type aluminum oxide layer, wherein: the α-type aluminum oxide layer has, on an opposite side to the substrate, a first interface, being the rake surface or a surface substantially parallel to the rake surface, a second interface, being the flank or a surface substantially parallel to the flank, and an intersecting edge between the first interface and the second interface; and the α-type aluminum oxide layer satisfies −600≤σ11≤300, −900≤σ22≤250 and σ11>σ22. (In the above formulae, σ11 denotes a residual stress value (MPa) in a direction parallel to the intersecting edge, σ22 denotes a residual stress value (MPa) in a direction orthogonal to the intersecting edge, and each of the residual stress values is a value measured by a 2D method).