| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a heat-resistant diamond compound sintered compact required particularly for speeding up of cutting of an oil bit for oil drilling and automobile special parts, and to provide a method for manufacturing the same. <P>SOLUTION: The heat-resistant diamond compound sintered compact comprises a sintered compact of superfine particulate synthetic diamond powder having an average particle diameter of ≤200 nm sintered without a sintering aid. It is a compound sintered compact consisting of diamond crystals and a very small amount of generated non-diamond carbon, and has a Vickers hardness of ≥85 GPa. The heat-resistant diamond compound sintered compact is manufactured by sealing synthetic diamond powder having an average particle diameter of ≤200 nm in a tantalum or molybdenum capsule, and heating and pressurizing the capsule with an ultrahigh pressure synthesizer at a temperature of ≥2,100°C and a pressure of ≥7.7 GPa which are required conditions of thermodynamic stability of diamond. <P>COPYRIGHT: (C)2004,JPO&NCIPI |
