| abstract |
[PROBLEMS] To provide a cBN tool that exhibits excellent chipping resistance and wear resistance in intermittent cutting of high hardness steel, and exhibits excellent cutting performance over a long period of use. [Solution] In a cutting tool made of a cBN sintered body using a cBN sintered body containing at least cBN particles as a tool base as a hard phase component, the cBN particles have an average formation ratio of 0.02 to 0.20 on the surface. The cBN sintered body has an Al 2 O 3 layer having an average layer thickness of 1.0 to 10 nm, and the cBN sintered body has a binder phase containing TiN, TiC, TiB 2 , TiCN, AlN, Al 2 O 3 and the like around the cBN particles. has, more preferably, the Al 2 O 3 present in the binder phase, Al 2 O 3, based on which is formed on the cBN particles surface is 100 vol% the volume of 50nm region from the surface of the cBN particles The said subject is solved because the total content rate is 2-40 volume% on average. [Selection] Figure 1 |