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›› 2008, Vol. 8 ›› Issue (6): 1153-1157.

• 过程与工艺 • 上一篇    下一篇

利用铁尾矿合成Si3N4粉

张淑会 康志强 吕庆 薛向欣 黄大威   

  1. 河北理工大学冶金与能源学院 河北理工大学资源与环境学院 河北理工大学冶金与能源学院 东北大学材料与冶金学院 东北大学
  • 收稿日期:2008-07-18 修回日期:2008-09-23 出版日期:2008-12-20 发布日期:2008-12-20
  • 通讯作者: 张淑会

Synthesis of Si3N4 Powder from Iron Ore Tailing

ZHANG Shu-Hui Zhi-Qiang KANG Qing LU XUE Xiang-xin HUANG Da-wei   

  1. College of Metallurgy and Energy, Hebei Polytechnic University College of Resources and Environment, Hebei Polytechnic University College of Metallurgy and Energy, Hebei Polytechnic University School of Materials and Metallurgy, Northeastern University
  • Received:2008-07-18 Revised:2008-09-23 Online:2008-12-20 Published:2008-12-20
  • Contact: ZHANG Shu-Hui

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摘要： 在热力学分析的基础上，以铁尾矿为主要原料，采用碳热还原氮化法合成了Si3N4粉. 研究了合成温度和N2流量对反应过程的影响，利用X射线衍射法、扫描电镜等检测了产物的组成及显微结构. 结果表明，随着合成温度的升高，产物中Si3N4相增多，1450℃时Si3N4相最多，且晶粒多呈等轴柱状或短棒状，此温度是最佳的合成温度. N2流量增加有利于还原氮化反应进行，600 mL/min较适宜. 合成过程中SiO气体的挥发导致试样质量损失较大.

关键词: 铁矿石尾矿, 碳热还原氮化, Si3N4, 合成温度, N2流量

Abstract: Based on thermodynamic analysis, Si3N4 powder was prepared by carbothermal reduction-nutridation from iron ore tailing. The phase composition and microstructure of sintered products were investigated by XRD and SEM techniques. The influences of synthesis temperature and N2 flow on the reaction process were also studied. The results show that Si3N4 phase in the products rises with increasing of synthesis temperature and reaches the maximum portion at 1450℃, which is assumed to be the optimal synthesis temperature. And Si3N4 crystal mostly exists as equiaxedly columnar or shot rod-like b-Si3N4. The increase of N2 flow is favorable to the reduction-nutridation process, and the optimal flow rate of N2 is 600 mL/min. Volatilization of SiO results in obvious mass loss of the tested samples.

Key words: iron ore tailing, carbothermal reduction-nitridation, Si3N4, synthesis temperature, N2 flow rate

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