| 摘要 |
An object of the present invention is to provide a cubic boron nitride sintered body and a coated cubic boron nitride sintered body which can elongate lifetime of a cutting tool or a wear resistant tool. The cubic boron nitride sintered body contains cubic boron nitride, a binder phase and inevitable impurities. An amount of the cubic boron nitride is 50% by volume or more and 80% by volume or less. A total amount of the binder phase and the inevitable impurities is 20% by volume or more and 50% by volume or less. The binder phase contains an Al compound and a Ti compound. The Al compound contains an Al element and at least one element selected from the group consisting of N, O and B. The Ti compound contains a Ti element and at least one element selected from the group consisting of C, N and B. When an X-ray diffraction intensity at a (100) plane of the AlN is made I 1 and an X-ray diffraction intensity at a (104) plane of the Al 2 O 3 is made I 2 , then I 1 /I 2 is 6 or more and 40 or less. When a total area of the cubic boron nitride and the Al compound is made S1, and an area of a region at which the cubic boron nitride and the Al compound are continuously contacted is made S2, then S2/S1 is 0.98 or more and 1.00 or less. |
