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Founded in 1987， Bimonthly
Supervisor：Jiangxi University Of Science And Technology
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Jiangxi Nonferrous Metals Society
ISSN：1674-9669
CN：36-1311/TF
CODEN YJKYA9
Volume 7 Issue 4
Aug.  2016
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DUAN Shengchao, MA Jianjun, GUO Hanjie, SHI Xiao, MAO Yu. Thermodynamic analysis and kinetics mechanism for direct nitridation reaction[J]. Nonferrous Metals Science and Engineering, 2016, 7(4): 14-21. DOI: 10.13264/j.cnki.ysjskx.2016.04.003
Citation: DUAN Shengchao, MA Jianjun, GUO Hanjie, SHI Xiao, MAO Yu. Thermodynamic analysis and kinetics mechanism for direct nitridation reaction[J]. Nonferrous Metals Science and Engineering, 2016, 7(4): 14-21. DOI: 10.13264/j.cnki.ysjskx.2016.04.003
shu

Thermodynamic analysis and kinetics mechanism for direct nitridation reaction

  • 1a.

    School of Metallurgical and Ecological Engineering

  • 1b.

    Beijing Key Laboratory of Special Melting and Preparation of High-End Metal Materials, University of Science and Technology Beijing, Beijing 100083, China

  • 2.

    CNMC Ningxia Orient Group Co. Ltd., Shizuishan 753000, China

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  • Received Date: January 18, 2016
  • Published Date: August 30, 2016
    Graphical Abstract
    • Abstract
  • The mechanism and chemical kinetics of nitridation reaction at different heating rates was investigated by thermogravimetry. It is found that there is an exothermic peak and an endothermic peak in the differential scanning calorimetry curve at 1 000~1 300 ℃ centigrade, which indicates that the mechanism has changed. The conversion rate of silicon nitride is significantly increased within 1 000 to 1 100 ℃, and it indicates temperature is the dominant factor affecting the conversion rate. Experiments results show that the restrictive step of nitridation reaction is composed of chemical reaction in early stage of reaction and the mixed-control of chemical reaction and intraparticle diffusion in the subsequent reaction; the apparent activation energy is kinetically calculated to be 404.5 kJ/mol, the frequency factor A=9.57×1015 min/s, the reaction order n=0.95, and mathematical expression of reaction rate equation is finally obtained.
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    • References (17)
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