SYNTHETIC METHOD OF CUBIC BORON NITRIDE SINGLE CRYSTAL

摘要

PURPOSE:To synthesize large and high quality CBN simple crystals in a short period of time by making BN from a BN feeding source dissolved in a solvent in contact with a BN existing surface only on a seed crystal of relatively low temperature. CONSTITUTION:The temperature of a seed crystal 2 side should be so lowered relatively by a graphite heater 7 as to be lower than the temperature of a contact face between a BN feeding source 3 and a solvent 4 such as LiSrBN2 or the like. BN from the BN feeding source 2 dissolved into the solvent 4 under the ultrahigh pressure and temperature of stabilized CBN is separated as CBN on the relative low temperature seed crystal 2. Said action is based on the difference of dissolving degrees of BN generated by the temperature difference. When CBN is separated on the seed crystal 2, single crystals are grown quickly only on a surface 2a of the seed crystal 2 where same numbers of B and N exist by covering with an inactive substance 5 such as molybdenum or the like in a manner not to be in contact with the solvent 4 except the surface 2a to grow.