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Critical evaluation and thermodynamic optimization of the Si-N, Si-C, C-N and Si-C-N systems and its applications to high purity SiC production

Cited 1 time in Web of Science Cited 1 time in Scopus
Authors

You, Zhimin; Jiang, Zhouhua; Jung, In-ho

Issue Date
2022-09
Publisher
Elsevier BV
Citation
Journal of the European Ceramic Society, Vol.42 No.12, pp.4793-4809
Abstract
© 2022 Elsevier LtdThermodynamic optimization of the Si-N, Si-C, C-N and Si-C-N systems were performed using the CALculation of PHAse Diagrams (CALPHAD) method based on critical evaluation of all available experimental data. The liquid and solid solutions within the Si-C-N system were described using the Modified Quasichemical Model and Compound Energy Formalism, respectively. The Gibbs energies of β-Si3N4 and β-SiC were carefully optimized to resolve inconsistencies among existing thermodynamic properties and phase equilibria data. The solubilities of C and N in both solid and liquid Si solutions were critically optimized. Besides, the solubility of N in β-SiC to form a narrow homogeneity range of β-Si(C,N) solid solution is considered for the first time in the present thermodynamic modeling. Based on the present thermodynamic database, experimentally unexplored phase diagrams and thermodynamic properties within the Si-C-N alloys were predicted. As an application of the database, the influences of various operation conditions on high purity SiC production using sublimation process were calculated.
ISSN
0955-2219
URI
https://hdl.handle.net/10371/184318
DOI
https://doi.org/10.1016/j.jeurceramsoc.2022.05.011
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