Abstract
Environmental barrier coatings for SiC/SiC composites are limited by the melting temperature of the Si bond coating near 1414 °C. Systems without a bond coating may be required for future turbine applications where material temperatures go beyond 1350 °C. Enhanced roughness SiC substrates were developed to assess coating adhesion without the bond coating. Two EBCs with different YbMS/YbDS ratios were produced via modified plasma spraying parameters. Coating microstructure, thermal expansion, and modulus were measured for comparison of coating properties. Cyclic steam exposures at 1350 °C were performed to assess oxidation resistance. The EBC with increased concentration of Yb2SiO5 secondary phase displayed a higher CTE, which is typically expected to decrease adhesion lifetimes due to an increase in stress upon thermal cycling. Yet, the EBC chemistry with increased Yb2SiO5 concentration was able to experience longer cycling times prior to coating delamination, likely due to interface interactions with the substrate and the thermally grown oxide.
| Original language | English |
|---|---|
| Pages (from-to) | 6473-6481 |
| Number of pages | 9 |
| Journal | Journal of the European Ceramic Society |
| Volume | 43 |
| Issue number | 14 |
| DOIs | |
| State | Published - Nov 2023 |
Funding
The authors would like to thank G. Garner, J. Wade, J. Horenburg, and C. O ’Dell from ORNL. The authors would also like to thank D. Sulejmanovic and J. Keiser for technical review at ORNL. This work was funded by the Advanced Turbine Program (program manager R. Dennis, program monitor P. Burke), Office of Fossil Energy and Carbon Management, U. S. Department of Energy. The authors would like to thank G. Garner, J. Wade, J. Horenburg, and C. O ’Dell from ORNL. The authors would also like to thank D. Sulejmanovic and J. Keiser for technical review at ORNL. This work was funded by the Advanced Turbine Program (program manager R. Dennis, program monitor P. Burke), Office of Fossil Energy and Carbon Management , U. S. Department of Energy. This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05–00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, world-wide license to publish or reproduce the published form of this manuscript, or allow others to do so, for United States Government purposes. The Department of Energy will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan )
Keywords
- Adhesion
- Atmospheric plasma spray
- Environmental barrier coating
- Oxidation