### A Combined Thermodynamic/Kinetic Modeling Approach to Predict SiC Recession Due to SiO$_{2}$ Scale Volatility Under Combustion EnvironmentsA Combined Thermodynamic/Kinetic Modeling Approach to Predict SiC Recession Due to SiO$_{2}$ Scale Volatility Under Combustion Environments

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 Author Zhang, F. ♦ Zhang, C. ♦ Chen, S. L. ♦ Cao, W. S. ♦ Zhu, J. Source SpringerLink Content type Text Publisher Springer US File Format PDF Copyright Year ©2014 Language English
 Subject Domain (in DDC) Natural sciences & mathematics ♦ Physics Subject Keyword activity ♦ CALPHAD approach ♦ materials behavior ♦ modeling ♦ multicomponent ♦ phase diagram ♦ thermodynamics ♦ Crystallography ♦ Thermodynamics ♦ Engineering Thermodynamics, Heat and Mass Transfer ♦ Ceramics, Glass, Composites, Natural Methods ♦ Metallic Materials Abstract A computational approach, which targets on the prediction of SiC recession caused by SiO$_{2}$ scale volatility under combustion environments, was developed in this study. In this approach, thermodynamic calculation was integrated with a gaseous-diffusion model to calculate the fluxes of volatile species, such as SiO(g), Si(OH)$_{4}$(g), SiO(OH)$_{2}$(g), and SiO(OH)(g), produced by the reaction of SiO$_{2}$ scale with the combustion air. The resulted weight loss of SiC was then calculated under a variety of combustion environments. The benefit of using environmental barrier coating (EBC) in the protection of SiC from recession was demonstrated by the calculation. It is shown that the weight loss of SiC-based ceramics could be significantly reduced when EBCs, such as mullite (Al$_{6}$Si$_{2}$O$_{13}$ or written as 3Al$_{2}$O$_{3}$·2SiO$_{2}$) or SrAS$_{2}$ (SrO·Al$_{2}$O$_{3}$·2SiO$_{2}$), are used. The effects of combustion conditions, such as temperature and total pressure, on the volatility of SiO$_{2}$ scale were also discussed. ISSN 15477037 Age Range 18 to 22 years ♦ above 22 year Educational Use Research Education Level UG and PG Learning Resource Type Article Publisher Date 2014-09-12 Publisher Place Boston e-ISSN 18637345 Journal Journal of Phase Equilibria and Diffusion Volume Number 35 Issue Number 6 Page Count 11 Starting Page 724 Ending Page 734