Preparation of Si3N4 Form Diatomite via a Carbothermal Reduction-Nitridation Process

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• 作者：Bin Ma ; Zhaohui Huang ; Lefu Mei ; Minghao Fang ; Yangai Liu ; Xiaowen Wu ; Xiaozhi Hu
• 刊名：JOM Journal of the Minerals, Metals and Materials Society
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：68
• 期：5
• 页码：1456-1464
• 全文大小：1,129 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Metallic Materials
  Nanotechnology
  Crystallography
  
• 出版者：Springer Boston
• ISSN：1543-1851
• 卷排序：68

文摘

Si₃N₄ was produced using diatomite and sucrose as silicon and carbon sources, respectively. The effect of the C/SiO₂ molar ratio, heating temperature and soaking time on the morphology and phase compositions of the final products was investigated by scanning electron microscopy, x-ray diffraction analysis and energy dispersive spectroscopy. The phase equilibrium relationships of the system at different heating temperatures were also investigated based on the thermodynamic analysis. The results indicate that the phase compositions depended on the C/SiO₂ molar ratio, heating temperature and soaking time. Fabrication of Si₃N₄ from the precursor via carbothermal reduction nitridation was achieved at 1550°C for 1–8 h using a C/SiO₂ molar ratio of 3.0. The as-prepared Si₃N₄ contained a low amount of Fe₃Si (<1 wt.%).