About this Abstract |
Meeting |
2022 TMS Annual Meeting & Exhibition
|
Symposium
|
Synergistic Irradiation, Corrosion, and Microstructural Evolution in Nuclear Materials
|
Presentation Title |
Atomic Level Mechanisms Underlying Hydrothermal Corrosion of Silicon Carbide in Nuclear Reactors |
Author(s) |
Jianqi Xi, Dane Morgan, Izabela Szlufarska |
On-Site Speaker (Planned) |
Jianqi Xi |
Abstract Scope |
Silicon carbide (SiC) has been recognized for its potential as the structural material in the accident tolerant fuel in the advanced light water reactors. However, one of the remaining issues that can limit its application is the hydrothermal corrosion. In this talk, I will discuss our recent theoretical studies revealing corrosion mechanisms of SiC in both the region of crystalline and general grain boundaries (GBs) as exposed to the hydrothermal environment. I will first discuss the elementary interfacial reactions driving corrosion on the crystalline surfaces, including a discovery of the unexpected hydrogen scission reaction that plays a key role in surface degradation. Our kinetic studies reveal that SiC is dissolved directly into the water without forming the silica layer, although the reactions are analogous to those observed during dissolution of silica. Secondly, I will discuss the influence of irradiation-induced segregation at the general GBs on the hydrothermal corrosion of SiC. |
Proceedings Inclusion? |
Planned: |
Keywords |
Nuclear Materials, Modeling and Simulation, |