Abstract
Chemical vapor deposited SiC single crystal and polycrystals were exposed to a static beryllium-bearing molten fluoride salt, 2LiF–BeF2 for 500 and 1000 h at 750 °C. Overall, the single crystal and polycrystalline SiC materials experienced slight weight loss and nominal surface etching regardless of the material type. Localized pitting and nonuniform Si removal from surface regions were associated with trace metal impurities and oxygen. Cross-sectional observation revealed minimal subsurface changes in the microstructure. The corrosion damage processes were similar to those reported for molten LiF–KF–NaF salt with trace impurities, indicating that the impurities significantly affect SiC corrosion.
| Original language | English |
|---|---|
| Article number | 111301 |
| Journal | Corrosion Science |
| Volume | 220 |
| DOIs | |
| State | Published - Aug 1 2023 |
Funding
Notice: This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05–00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US 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 US government purposes. DOE 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 work was supported by the US Department of Energy , Office of Nuclear Energy and Office of Fusion Energy Sciences, under contact DE-AC05–00OR22725 with UT-Battelle, LLC. Contribution to the project management by Josina Geringer (ORNL) is greatly acknowledged. Gavin Mattingly at ORNL fabricated the TEM specimens. Analysis of pretested salt was coordinated by Dino Sulejmanovic at ORNL. Alan Frederick at ORNL contributed to the corrosion test. The authors wish to thank Dino Sulejmanovic, Mackenzie Ridley, TS Byun, and Erica Heinrich at ORNL for reviewing and editing this manuscript. This work was supported by the US Department of Energy, Office of Nuclear Energy and Office of Fusion Energy Sciences, under contact DE-AC05–00OR22725 with UT-Battelle, LLC. Contribution to the project management by Josina Geringer (ORNL) is greatly acknowledged. Gavin Mattingly at ORNL fabricated the TEM specimens. Analysis of pretested salt was coordinated by Dino Sulejmanovic at ORNL. Alan Frederick at ORNL contributed to the corrosion test. The authors wish to thank Dino Sulejmanovic, Mackenzie Ridley, TS Byun, and Erica Heinrich at ORNL for reviewing and editing this manuscript.
Keywords
- Ceramic
- High-temperature corrosion
- Molten salts