摘要
本文以三聚氰胺和硼酸为原料,先采用湿化学法合成棒状前驱物,然后将其在空气气氛中高温培烧制得六方氮化硼。实验考察了反应原料配比,反应物浓度,高温培烧的时间及温度对产物的影响。采用IR、化学分析、XRD、粒度分析和SEM等方法对前驱物及产物进行了表征,确定了前驱物及产物的组成、物相、粒度分布及形貌。研究结果表明:合成前驱物的适宜原料配比是C3N6H6∶H3BO3=1∶2,浓度为0.4 mol/L,合成的前驱物是分子式为C3N6H6.2H3BO3的棒状超分子加合物;在温度950℃,空气气氛中培烧6 h能得到晶型良好、平均粒径为15μm的六方氮化硼粉体。
In this paper, a kind of precursor was prepared by a wet chemical approach using melamine （ C3N6H6 ） and boric acid （H3BO3 ） as starting material, hexagonal boron nitride was then synthesized by the high temperature treatment of the precursor in the air. To get an insight into the synthesis process of boron nitride, the effects of melamine to boron acid molar ratio, the solution concentration, the synthesis temperature and time were respectively investigated. The precursor and product were respectively characterized by FT-IR, chemical composition, XRD, particle size analyses and SEM analyses. The results indicated that a better precursor is synthesized by using the molar ratio of 1 ： 2 for the melamine and boric acid and the solution concentration of 0.4 mol/L for the reactants, and the morphology of precursor that is identified as a supramolecular adduct exhibits a rod-like crystals and its molecular formula is C3N6H6·2H3BO3. Then the rod-like precursor is treated at 950℃ for 6 h to afford good crystals of h-BN powder with a primary particle size of 15 μm.
出处
《硅酸盐通报》
CAS
CSCD
北大核心
2012年第4期943-949,共7页
Bulletin of the Chinese Ceramic Society
