Effects of additives on the synthesis of spherical aluminum nitride granules by carbothermal reduction-nitridation process
Effects of additives on the synthesis of spherical aluminum nitride granules by carbothermal reduction-nitridation process
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添加剂对碳热还原氮化法合成球形氮化铝颗粒的影响
DOI：
10.1016/j.jallcom.2016.11.252
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发表时间：
2017-03-05
影响因子：
6.2
通讯作者：
Cao, Wenbin
中科院分区：
文献类型：
--
作者：
Wang, Qi;Ge, Yiyao;Cao, Wenbin
研究了碳热合成球形AlN颗粒过程中不同添加剂对AlN转化率、失重率、相组成和表面形貌的影响。结果表明，添加剂对氮化速率的提高、球形形貌的形成和晶粒尺寸的增大都有重要作用。同时添加CaF2和YF3时，各样品的氮化速率最高，而在特定温度下，过量的CaF2会延缓氮化过程。但在高温下，铝酸钙在合成过程中有减少和进一步挥发的趋势。此外，通过分析碳热还原-氮化过程的失重情况，揭示了不同添加剂在体系中的反应机理。(C) 2016 Elsevier B.V.版权所有
In this work, the effects of various additives on the AlN conversion fraction, weight loss, phase compositions and surface morphology during the carbothermal synthesis of spherical AlN granules were investigated in detail. The results inferred that additives played an important role in the improvement of nitridation rate, the formation of spherical morphology and the growth of particle size. The simultaneous addition of CaF2 and YF3 resulted in the highest nitridation rate in all samples, while excessive CaF2 appeared to retard the nitridation process at a particular temperature. However, Ca-aluminates forming in the synthesis process tended to be reduced and further volatilized at high temperature. Furthermore, by analyzing the weight loss during the carbothermal reduction-nitridation process, the reaction mechanisms in the systems using different additives were also attentively disclosed. (C) 2016 Elsevier B.V. All rights reserved.