| 摘要 |
A sintered compact is obtained by sintering a mixture containing about 50 to 75 percent by volume of cubic boron nitride and about 25 to 50 percent of a binder under cBN-stable superhigh pressure conditions. The binder contains about 20 to 50 percent by weight of Al and one or more Ti compounds selected from the group consisting of TiNz, Ti(C,N)z, TiC2, (Ti,M)Cz, (Ti,M) (C,N)z and (Ti,M)Nz, wherein M indicates a transition metal of the group IVa, Va or VIa of the periodic table excepting Ti, and wherein z is within a range of 0.5</=z</=0.85. The atomic ratio of the content of Ti to that of the transition metal M in the binder is within the range of about 2/1</=Ti/M</=97/3. The binder further contains tungsten or one or more tungsten compounds, whereby the total tungsten concentration in the binder is about 4 to 40 percent by weight. |
