| 摘要 |
A cBN sintered material cutting tool is provided. The cBN cutting tool includes a cutting tool body, which is a sintered material including cBN grains and a binder phase, wherein the sintered material comprises: the cubic boron nitride grains in a range of 40 volume% or more and less than 60 volume%; and Al in a range from a lower limit of 2 mass% to an upper limit Y, satisfying a relationship, Y = -0.1X+10, Y and X being an Al content in mass% and a content of the cubic boron nitride grains in volume%, respectively, the binder phase comprises: at least a Ti compound; Al 2 O 3 ; and inevitable impurities, the Al 2 O 3 includes fine Al 2 O 3 grains with a diameter of 10 nm to 100 nm dispersedly formed in the binder phase, and there are 30 or more of the fine Al 2 O 3 grains generated in an area of 1 µm×1 µm in a cross section of the binder phase. |
