| 摘要 |
This is to provide a coated tool which can elongate tool life than those of the conventional tools. The coated tool comprises a substrate and a coating layer formed on a surface of the substrate. The coating layer contains a first laminated structure and a second laminated structure. The first laminated structure and the second laminated structure are continuously laminated twice or more alternately. The first laminated structure contains at least two kinds of layers having different compositions, and the two kinds of the layers are alternately laminated twice or more. An average thickness of the layers contained in the first laminated structure is 60 nm or more and 500 nm or less. The second laminated structure contains at least two kinds of layers having different compositions, and the two kinds of the layers are alternately laminated twice or more. An average thickness of the layers contained in the second laminated structure is 2 nm or more and less than 60 nm. The layers contained in the first laminated structure and the second laminated structure contain a compound comprising at least one metal element selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Al, Si, Sr, Y, Sn and Bi, and at least one non-metal element selected from the group consisting of carbon, nitrogen, oxygen and boron. An average thickness(es) of the first laminated structure and/or the second laminated structure is/are continuously or stepwisely reduced from the substrate side toward the surface side of the coating layer. |
