| 摘要 |
PURPOSE:To improve grinding ability of grinding particles, by heat-treating grinding particles of BN of cubic system in a molten salt at a specific temperature so that impurities are dissolved in the bath without damaging the grinding particles. CONSTITUTION:Grinding particles of BN of cubic system are heat-treated in a molten salt (preferably water-soluble chloride of NaCl-KCl system) at 500- 1,300 deg.C, preferably 700-1,000 deg.C. The heat-treatment is preferably carried out <=5 deg.C/min low rate of heating.
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