| 摘要 |
An object of the present invention is to provide a cubic boron nitride sintered body excellent in wear resistance and fracture resistance, and it is provided a cubic boron nitride sintered body which comprises 85 to 95% by volume of cubic boron nitride, and 5 to 15% by volume of a binder phase and inevitable impurities, wherein the binder phase comprises three or more compounds selected from the group consisting of a carbide, a nitride, a carbonitride, an oxide and a mutual solid solution thereof of an element(s) selected from the group consisting of Al, V, Cr, Mn, Co, Ni, Nb and Mo, and an amount of an aluminum element contained in the cubic boron nitride sintered body is 0.5 to 5% by mass based on a total mass of the cubic boron nitride sintered body, provided that a metal simple substance and an alloy are not contained in the binder phase. |
