Investigation of isothermal and no-isothermal oxidation of SiC powder using an analytic kinetic model

The oxidation of SiC powder has been investigated under non-isothermal and isothermal conditions. X-ray diffraction (XRD) analysis and transmission electron microscopy (TEM) were employed to investigate the morphological development during the oxidation. The results show that the major oxidation pro...

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Bibliographic Details
Published in:Applied surface science 2010-11, Vol.257 (2), p.463-467
Main Authors: Li, Yong, Yang, Yun, Lin, Zhi-Ming, Li, Jiang-Tao
Format: Article
Language:English
Subjects:
Analytic kinetic model
Apparent activation energy
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Condensed matter: structure, mechanical and thermal properties
Cross-disciplinary physics: materials science
rheology
Diffraction
Disordered solids
Exact sciences and technology
Gain
Materials science
Mathematical analysis
Mathematical models
Oxidation
Physics
Powders, porous materials
Reaction kinetics
SiC powder
Silicon carbide
Single-crystal and powder diffraction
Structure of solids and liquids
crystallography
Surface treatments
Transmission electron microscopy
X-ray diffraction and scattering
X-rays
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Summary:The oxidation of SiC powder has been investigated under non-isothermal and isothermal conditions. X-ray diffraction (XRD) analysis and transmission electron microscopy (TEM) were employed to investigate the morphological development during the oxidation. The results show that the major oxidation product was amorphous silica and the oxidation reaction was mainly diffusion-controlled. Based on limited experimental data, an analytic kinetic model, which expresses the oxidation weight gain as a function of time and temperature explicitly, has been used to predict the oxidation behavior of SiC powder. The comparison between experimental results and theoretical calculation shows that this new model works very well. The activation energy of non-isothermal and isothermal oxidation of SiC powder has been derived to be 226.5kJ/mol and 187.5kJ/mol, respectively.
ISSN:0169-4332
1873-5584
DOI:10.1016/j.apsusc.2010.07.012