| About this Abstract |
| Meeting |
2025 TMS Annual Meeting & Exhibition
|
| Symposium
|
Microstructural, Mechanical, and Chemical Behavior of Solid Nuclear Fuel and Fuel-Cladding Interface II
|
| Presentation Title |
Improving Radiation and Corrosion Resistance of Cr-Based Coatings Through Structural and Compositional Optimization |
| Author(s) |
Nabil Daghbouj, Tomas Polcar |
| On-Site Speaker (Planned) |
Nabil Daghbouj |
| Abstract Scope |
Protective coatings, like Cr coatings, can suffer from irradiation damage even before accidents occur. This study evaluates the radiation and oxidation tolerance of three Cr-based coatings—Cr, CrAlSi, and CrAlSiN—with different microstructures. The Cr and CrAlSi coatings experienced significant structural degradation, forming helium bubbles and experiencing amplified Kirkendall effects at HT. In contrast, the irradiated CrAlSiN coating maintained its structural integrity without measurable irradiation hardening. After annealing, around 40% of the helium was released, indicating a "self-healing" mechanism. Moreover, the CrAlSiN coating showed superior oxidation resistance compared to the others. The irradiated CrAlSiN sample exhibited a significantly thinner oxide scale than the pristine one due to a more protective oxide scale and rapid outward diffusion of Cr, Al, and Si through nanochannel veins. These findings offer insights into structure and composition effects on irradiation and oxidation behavior in Cr-based coatings, aiding the development of new-generation accident-tolerant fuel.
|
| Proceedings Inclusion? |
Planned: |
| Keywords |
Nuclear Materials, Characterization, High-Temperature Materials |