|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Accident Tolerant Fuels for Light Water Reactor
||Microstructure Studies of Interdiffusion Behavior of U3Si2 and SiC
||Rita Hoggan, Jason Harp, Lingfeng He
|On-Site Speaker (Planned)
Fuel swelling during normal reactor operations could lead to unfavorable chemical interactions when in contact with its cladding. As new fuel/cladding systems are developed, it is crucial to understand the interaction behavior between them. Diffusion experiments between U<SUB>3</SUB>Si<SUB>2</SUB> and SiC were conducted at 800, 1000, and 1200 °C for 100 h each in a vacuum environment. The microstructure of interdiffusion products were examined using optical microscopy and scanning electron microscopy (SEM) equipped with an energy dispersive X-ray spectroscopy (EDS) system. The test at 1000°C formed large interaction regions up to 630 ± 9 µm wide, with a 160 ± 4 µm wide, roughly parallel layer that formed along the entire material interface. The primary diffusion occurred as Si rich phases penetrating the U<SUB>3</SUB>Si<SUB>2</SUB> fuel. Dissociation of U<SUB>3</SUB>Si<SUB>2</SUB> along the material interface into a U<SUB>3</SUB>Si eutectic structure within a Si rich matrix was observed. No interaction was observed at 800 °C.
||Planned: Supplemental Proceedings volume