CAJ | 학술논문

利用水热法合成了立方氮化硼(cBN),利用立方氮化硼在特定反应条件下的自发团聚现象,提出了一种使混合物中的立方氮化硼在反应过程中自发纯化的新方法.提高原料浓度、反应温度和搅拌速度有利于获得较大粒径的立方氮化硼和尺寸分布均匀的团聚颗粒,但提高反应压力则会导致相反的结果.探讨了自团聚现象在生长大尺寸立方氮化硼晶体以及非均相合成中的潜在应用价值.
이용수열법합성료립방담화붕(cBN),이용립방담화붕재특정반응조건하적자발단취현상,제출료일충사혼합물중적립방담화붕재반응과정중자발순화적신방법.제고원료농도、반응온도화교반속도유리우획득교대립경적립방담화붕화척촌분포균균적단취과립,단제고반응압력칙회도치상반적결과.탐토료자단취현상재생장대척촌립방담화붕정체이급비균상합성중적잠재응용개치.
Hydrothermal method was used to synthesize Cbn. However, it was found that BN samples prepared by this method were usually mixtures of Cbn, Hbn and other phases of BN, which is a disadvantage for the further application. So, it is expected to explore new methods by which Cbn can be easily separated from the mixture. The present paper deals with a method based on the self-aggregation phenomenon of Cbn crystallites to prepare pure millimmeter-size Cbn agglomerates under specific hydrothermal conditions. The particle size and its uniformity of the agglomerates can be improved by increasing the reaction temperature, concentration of reactants, and the homogeneity of reaction solution. In contrast, increasing the pressure results in an opposite trend. A simple model was proposed to explain the mechanism of the self-aggregation phenomenon.