| 摘要 |
The invention provides a sintered body for high- hardness tools which, when used for cutting work of cast irons where the cutting edge undergoes high temperature and abrupt impact, holds high chip-off and abrasion resistances and exhibits good cutting performance. The sintered body for high-hardness tools is obtained by sintering 60 to 75% by volume of cubic boron nitride powder and remaining part of a binder powder under a superhigh pressure, the binder comprising 5 to 15% by weight of Al, and the remaining part comprising a compound represented by (HfxTiyM1-x-y)(CzN1-2)a (where M denotes an element belonging to IVa, Va or VIa group in the periodic table except Ti and Hf, and where 0.1 x 0.5, 0.5 y 0.9, 0.7 z 0.9, and 0.6 .alpha. 0.8) or a mixture of a plurality of compounds that totally results in the aforementioned composition.
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