Liquid-Phase-Assisted Catalytic Nitridation of Silicon and In Situ Growth of α-Si3N4 |
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Authors: | Zhenglong Liu Zhinan Chai Chao Yu Jun Ding Chengji Deng Xiangcheng Li Hongxi Zhu |
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Affiliation: | 1.The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China;2.Guangzhou Newlife New Material Co., Ltd., Guangzhou 511356, China |
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Abstract: | Si3N4 powders were synthesized with Fe, Co, or Ni as catalysts using Si powder at 1250 °C in a nitrogen atmosphere by liquid-phase-assisted catalytic nitridation synthesis (LPA–CNS). The catalytic effects of the metals on the nitridation of silicon powder were investigated by mixing the powder with 2 wt% by mass of Fe, Co, or Ni in a high-temperature liquid phase in flowing nitrogen. The α-Si3N4 micro-morphology could be effectively changed by adjusting the type of catalyst in the initial reaction mixtures. Fe, Co, and Ni promoted the formation of α-Si3N4 at 1250 °C and controlled the morphology of the α-Si3N4 particles. The hexagonal flakes of α-Si3N4 with a better defined morphology were obtained using Ni as the catalyst, compared to that obtained from the other two catalysts. |
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Keywords: | liquid-phase-assisted, catalytic nitridation, α -Si3N4, microstructure |
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