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过程工程学报 ›› 2017, Vol. 17 ›› Issue (3): 558-564.DOI: 10.12034/j.issn.1009-606X.216312CSTR: 32067.14.jproeng.216312

• 过程与工艺 • 上一篇    下一篇

氮化钒制备热力学和动力学

王安仁，  袁吉峰*   

  1. 北京科技大学冶金与生态工程学院，北京 100083
  • 收稿日期:2016-09-22 修回日期:2016-11-08 出版日期:2017-06-20 发布日期:2017-06-14
  • 通讯作者: 袁吉峰 13661377322@126.com

Thermodynamics and Dynamics of Vanadium Nitride Preparation

Anren WANG,  Jifeng YUAN*   

  1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083, China
  • Received:2016-09-22 Revised:2016-11-08 Online:2017-06-20 Published:2017-06-14

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被引次数

1

摘要：

研究了氮气气氛下V2O5碳热还原氮化反应的热力学和动力学，并进行了实验验证. 结果表明，反应炉内V2O5优先还原，在碳充足的情况下，还原的中间产物依次是V2O3, VO, V2C, VC. 还原氮化通常在N2气氛下同炉进行，先还原后氮化，温度高于1267℃时，VC比VN更稳定，存在动力学和热力学矛盾. V2O5碳热还原反应的控速环节为球形颗粒的三维扩散，氮化反应的控速环节为一级界面反应. 制备了氮含量18%、钒含量78%、碳含量小于2%的钒氮合金.

关键词: 氮化钒, 热力学, 动力学, 常压, 一步法, 碳热还原氮化

Abstract: The thermodynamics and dynamics of the reduction and nitridation of V2O5 at N2 atmosphere were researched with the experimental verification. The results indicated that the prior reaction is V2O5 reduction in the furnace, and the semifinished products are sequentially by V2O3, VO, V2C and VC when the carbon is sufficient. Reduction and nitridation are currently carried out in one furnace at N2 atmosphere. Reduction is prior to nitridation. The stability of VC is better than VN when the temperature is over 1267℃, and heterogeneity exits at thermodynamic and pure dynamic. The restriction of carbon thermal reduction of V2O5 is three-dimensional diffusion in spherical particle, while the restriction of nitridation is primary interface reaction. The vanadium nitride of 18% nitrogen and 78% vanadium content is obtained by the experiment, while the carbon is less 2%.

Key words: vanadium nitride, thermodynamics, dynamics, reduction, nitridation