Effect of Moisture on the Oxidation Behavior of ZrB₂
Abstract
Oxidation studies of ZrB2 were performed under wet air and dry air conditions at 1200°C, 1400°C, and 1500°C for 1, 4, and 10 h. Compared to dry air, the presence of water vapor was found to enhance the oxidation kinetics by a factor of 7 to 30, depending on the temperature. Thermodynamic calculations suggested that water vapor promoted the formation of additional volatile species such as boric acid (HBO2), in addition to boria (B2O3) produced in dry air, which increased the evaporation rate of B2O3. Compared to dry air, the presence of water vapor leads to more rapid evaporation of boria and the transition from parabolic oxidation kinetic behavior (ie, rate controlled by diffusion through boria) to linear (ie, underlying ZrB2 is directly exposed to the oxidizing environment) at shorter times and lower temperatures.
Recommended Citation
R. Naraparaju et al., "Effect of Moisture on the Oxidation Behavior of ZrB₂," Journal of the American Ceramic Society, vol. 104, no. 2, pp. 1058 - 1066, Wiley, Feb 2021.
The definitive version is available at https://doi.org/10.1111/jace.17500
Department(s)
Materials Science and Engineering
Keywords and Phrases
Oxidation; Ultra-High Temperature Ceramics; Zirconia
International Standard Serial Number (ISSN)
0002-7820; 1551-2916
Document Type
Article - Journal
Document Version
Citation
File Type
text
Language(s)
English
Rights
© 2021 American Ceramic Society, All rights reserved.
Publication Date
01 Feb 2021
Comments
Named one of the best papers of 2021 by the Journal of the American Ceramic Society (ACerS).