| 摘要 |
<P>PROBLEM TO BE SOLVED: To obtain an ultrafine particle translucent cBN sintered compact which contains cBN in the amount of 100%, which has never been obtained by a conventional technology for synthesizing a high purity cBN sintered compact, and which has a fine structure such that the diameters of the constitutive particles are ≤0.1 μm and is translucent. <P>SOLUTION: The high purity ultrafine particle cBN sintered compact which contains cBN in the amount of 100%, has an average particle diameter in the sintered compact of ≤0.1 μm, and is translucent is manufactured by using, as a raw material, low pressure phase boron nitride, and sintering it at a pressure not lower than 9.5×10<SP>4</SP>atm and at a temperature of 1,700 to 1,900°C at which the cubic boron nitride (cBN) is thermodynamically stable without adding a sintering aid while accompanying a high pressure phase transition to the cubic crystal phase. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
