Abstract
A key consideration for the successful operation of hybrid energy systems will be the environmental stability of materials used for their construction, particularly when experiencing service environments containing water vapor at high temperatures. Here, we report results from the characterization of siliconized silicon carbide (Si-SiC) prepared via binder jet additive manufacturing and reactive silicon melt infiltration after being exposed to environments representative of those in solid oxide fuel cell (SOFC) anodes, and to exhaust gases inside a microturbine operating on natural gas. In both cases, it was found that oxide scales formed on the surface and that these scales were dense, continuous, and well-bonded to the substrates, although there was evidence of transverse and longitudinal cracking most likely as a result of mismatches in the thermal expansion of the scale and the substrate. Measured values of the thickness of the oxide scale were compared to those predicted by parabolic oxidation kinetics of silicon, but the potential effects of silica volatilization induced by water vapor, and silica reduction when exposed to hydrogen are discussed. The overall results showed that the oxide scale is expected to be protective under the conditions of hybrid power generation systems.
Original language | English |
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Pages (from-to) | 6141-6151 |
Number of pages | 11 |
Journal | Journal of the American Ceramic Society |
Volume | 106 |
Issue number | 10 |
DOIs | |
State | Published - Oct 2023 |
Funding
This research was sponsored by the U.S. Department of Energy, ARPA-E Integrate Program under contract number DE-AR0000958. The authors are grateful for the experimental support provided by Adam W. Willoughby, Brian Goins, Dana McClurg, Ercan Cakmak, Alexis Flores-Betancourt, Christina Austin, and Tom Geer. Yoon would like to acknowledge Dr. João Vitor Campos for his help with AutoCAD. The technical review and comments by Mackenzie Ridley are greatly appreciated. This manuscript has been authored by UT-Battelle LLC under Contract No. DE-AC0500OR22725 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 nonexclusive, paid-up, irrevocable, worldwide 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). This research was sponsored by the U.S. Department of Energy, ARPA‐E Integrate Program under contract number DE‐AR0000958. The authors are grateful for the experimental support provided by Adam W. Willoughby, Brian Goins, Dana McClurg, Ercan Cakmak, Alexis Flores‐Betancourt, Christina Austin, and Tom Geer. Yoon would like to acknowledge Dr. João Vitor Campos for his help with AutoCAD. The technical review and comments by Mackenzie Ridley are greatly appreciated. This manuscript has been authored by UT‐Battelle LLC under Contract No. DE‐AC0500OR22725 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 nonexclusive, paid‐up, irrevocable, worldwide 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
- oxidation
- printing
- silicon
- silicon carbide
- volatilization