| 摘要 |
PURPOSE:To obtain the title sintered body having high hardness suitable to an electronic material and a cutting tool by mixing specific amounts of addition agent consisting of Si3N4, Y2O3 and AlN in specific mol. ratios to cubic boron nitride powder and subjecting the mixture to hot pressing. CONSTITUTION:The addition agent consisting of 20-98mol.% Si3N4, 1-50mol.% Y2O3 and 1-70mol.% AlN is prepd. Said addition agent, 0.03-8vol.%, is then mixed to the cubic boron nitride powder and hot pressing is executed thereto to obtain the cubic boron nitride sintered body. Said hot pressing is suitably executed at >=1 700 deg.C under >=50k b pressure. By this method, since the sintered body having high hardness equal to that of a single crystal can be manufactured in the use of relatively small amounts of addition agent, the sintered body suitable to an electronic material can be obtd. The sintered body having excellent hardness, toughness, etc., and suitable as a cutting tool can be manufactured at the time of increasing the addition agent. |
