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利用化学溶液法,于酒精、水混合溶液中溶解分散H3BO3和CO(NH2)2,再加入TiB2,干燥后热处理合成了BN/TiB2纳米-微米复合粉末。通过差热-热重分析、X射线衍射和红外光谱分析,对合成产物进行了表征。结果表明:BN合成反应在700～1100℃之间完成,BN/TiB2复合粉末经1500℃热处理时,非晶态BN向h-BN转化。利用扫描电镜、透射电镜分析了粉体复合前后的形貌及显微结构特征,结果表明:BN包覆在TiB2颗粒表面获得了具有纳米-微米复合结构的BN/TiB2粉末。
The chemical solution method was used to dissolve and disperse H3BO3 and CO (NH2) 2 in the mixed solution of alcohol and water, then TiB2 was added, and then the BN / TiB2 nanometer-micron composite powder was synthesized after heat treatment. The synthesized products were characterized by DTA-TG, X-ray diffraction and FTIR. The results show that the BN synthesis reaction is completed at 700-1100 ℃. When the BN / TiB2 composite powder is heat-treated at 1500 ℃, the amorphous BN is transformed into h-BN. The morphologies and microstructures of the powders before and after composites were analyzed by scanning electron microscope and transmission electron microscope. The results show that BN / TiB2 powders with nano-micron composite structure were obtained by coating BN on TiB2 particles.