Effect of Si3N4 diluent on direct nitridation of silicon powder

稀释剂 材料科学 差示扫描量热法 微观结构 扫描电子显微镜 化学工程 氮化硅 热重分析 相(物质) 分析化学(期刊) 核化学 复合材料 冶金 化学 有机化学 热力学 物理 工程类
作者
Xing Jin,Pengfei Xing,Yanxin Zhuang,Jian Kong,Shengnan Jiang,Donghui Wei
出处
期刊:Ceramics International [Elsevier BV]
卷期号:45 (8): 10943-10950 被引量:15
标识
DOI:10.1016/j.ceramint.2019.02.175
摘要

To investigate the effect of the Si3N4 diluent on the direct nitridation of silicon powder, the direct nitridation of silicon powder doped with different contents of α-Si3N4 and β-Si3N4 diluents was studied in detail. The phase constituent and microstructure of the products were detected using X-ray diffraction and scanning electron microscopy. Moreover, the weight changes and heat flow changes in the samples in the heating-up stage were investigated using thermogravimetric and differential scanning calorimetry. The results revealed that both the α-Si3N4 diluent and the β-Si3N4 diluent can accelerate the nitridation by decreasing the oxygen content in silicon powder. It was also revealed that both the α-Si3N4 diluent and the β-Si3N4 diluent can promote the formation of α-Si3N4 by decreasing the extensive-nitridation temperature. The determination of the relationship between heat and temperature changes revealed that when an identical amount of silicon and Si3N4 absorb an equal amount of heat, the temperature increment of the former is approximately 5.8 times that of the latter. Thus, the α-Si3N4 diluent and the β-Si3N4 diluent mainly function as heat accepters in the direct nitridation of silicon powder. They can absorb the additional heat released from the reaction between silicon and nitrogen and thus hinder the formation of the liquid phase in the nitridation process, thereby inhibiting the formation of an agglomerate phase and short needle-like Si3N4 as products.
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