| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a high purity superfine particulate cubic boron nitride (cBN) having a fine structure of ≤0.1 μm constituent particle diameter which can not be attained by a conventional high purity cBN synthetic technology, containing 100% cBN and having light transmissivity. <P>SOLUTION: The sintered compact having 100% cBN content, ≤0.1 μm average particle diameter and light transmissivity is obtained by sintering a hexagonal boron nitride used as a raw material under a condition of a 95,000 atm and ≥1,700°C and ≤1,900°C, in which the hexagonal boron nitride is thermodynamically stable, with the high pressure phase transition to the cubic system without adding any auxiliary agent. <P>COPYRIGHT: (C)2008,JPO&INPIT |
