Thermodynamic Analysis of ZrB₂-SiC Oxidation: Formation of a SiC-depleted Region
Abstract
A thermodynamic model was developed to explain the formation of a SiC-depleted layer during ZrB2-SiC oxidation in air at 1500°C. The proposed model suggests that a structure consisting of (1) a silica-rich layer, (2) a Zr-rich oxidized layer, and (3) a SiC-depleted zirconium diboride layer is thermodynamically stable. The SiC-depleted layer developed due to active oxidation of SiC. The oxygen partial pressure in the SiC-depleted layer was calculated to lie between 4.0 × 10−14 and 1.8 × 10−11 Pa. Even though SiC underwent active oxidation, the overall process was consistent with passive oxidation and the formation of a protective surface layer.
Recommended Citation
W. Fahrenholtz, "Thermodynamic Analysis of ZrB₂-SiC Oxidation: Formation of a SiC-depleted Region," Journal of the American Ceramic Society, American Ceramic Society, Jan 2007.
The definitive version is available at https://doi.org/10.1111/j.1551-2916.2006.01329.x
Department(s)
Materials Science and Engineering
Keywords and Phrases
SiC-Depleted Region; Thermodynamic Analysis; ZrB2-SiC Oxidation
International Standard Serial Number (ISSN)
0002-7820; 1551-2916
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2007 American Ceramic Society, All rights reserved.
Publication Date
01 Jan 2007
