Thermodynamic analysis and kinetics mechanism for direct nitridation reaction

DUAN Shengchao; MA Jianjun; GUO Hanjie; SHI Xiao; MAO Yu

doi:10.13264/j.cnki.ysjskx.2016.04.003

Volume 7 Issue 4

Aug. 2016

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Nonferrous Metals Science and Engineering > 2016 > 7(4): 14-21. > DOI: 10.13264/j.cnki.ysjskx.2016.04.003

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

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Thermodynamic analysis and kinetics mechanism for direct nitridation reaction

DUAN Shengchao^{1a, 1b},
MA Jianjun^{1a, 2},
GUO Hanjie^{1a, 1b, ,},
SHI Xiao^{1a, 1b},
MAO Yu^1a

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

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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.
- silicon nitride,
- thermogravimetric analysis,
- thermodynamics,
- kinetic modeling,
- synthesis

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