| 摘要 |
PURPOSE:To enable mass production of fine powder of high-purity boron without necessitating complicated process at a low cost, by heat-treating boron nitride having quasi-graphite structure under reduced pressure. CONSTITUTION:Boron is produced by thermal decomposition of boron nitride. The reaction is carried out by heat-treating boron nitride having quasi-graphite structure at 1,900-2,600 deg.C under reduced pressure of <=20 Torr. The boron nitride having quasi-grahite structure is produced preferably by mixing a boron compound with a nitriding agent (e.g. urea, melamine, dicyan-diamide, etc.) and heat-treating the mixture in a non-oxidizing atmosphere at 1,000-1,600 deg.C.
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