| 摘要 |
A surface-coated boron nitride sintered tool, wherein at least a cutting edge portion is provided with a cubic boron nitride sintered compact and a coating film which is formed on the surface of the cubic boron nitride sintered compact. The coating film comprises a layer (A), a layer (B) and a layer (C), and the layer (C) is arranged between the layer (A) and the layer (B). The layer (A) contains Ti and the like. The layer (B) is obtained by alternately laminating compound (B1) layers which contain Ti, Si and the like and compound (B2) layers which contain Al and the like. The layer (C) contains McLczc (wherein Mc represents one or more elements selected from among the group 4 elements, the group 5 elements and group 6 elements of the periodic table, Al and Si; Lc represents one or more elements selected from among B, C, N and O; and zc is more than 0 but 0.85 or less). |
