| 摘要 |
A PVD or PECVD coated cutting tool is provided to obtain a coating having improved wear resistance as well as improved adhesion properties by comprising a substrate A coated with a multilayer in which metal oxide+metal oxide nanocomposite layers C and metal oxide+metal oxide nanocomposite layers D are alternately laminated. In a cutting tool comprising a substrate(A) of cemented carbide, cermet, ceramics, cubic boron nitride or high speed steel, and an adherent, hard and wear resistant thin coating deposited at least on the functioning faces of the surface of the substrate, the cutting tool is characterized in that the coating comprises a multilayer(B) in which PVD or PECVD metal oxide layers(C,D) are alternately laminated, Me1X+Me2X+Me1X+Me2X..., where the metal atoms Me1 and Me2 are at least one of Ti, Nb, V, Mo, Zr, Cr, Al, Hf, Ta, Y and Si, preferably Hf, Ta, Cr, Zr and Al, most preferably Zr and Al, and at least one of Me1X and Me2X is a metal oxide+metal oxide nanocomposite layer comprised of two components, A and B, with different composition and different structure, the components consisting of a single phase oxide of one metal element or a solid solution of two or more metal oxides, wherein the layers Me1X and Me2X are different in composition or structure or both the composition and structure and have an individual layer thicknesses of 0.4 nm to 50 nm, and wherein the laminated multilayer has a total thickness of 0.2 and 20 mum and has a composition gradient with respect to the concentration of at least one metal atom in the direction from the outer surface of the coating to the substrate, the composition gradient being formed such that the difference between an average concentration of an outermost portion of the multilayer and an average concentration of an innermost portion of the multilayer is at least 5 at.% in the absolute unit.
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