|About this Abstract
||2023 TMS Annual Meeting & Exhibition
||Late News Poster Session
||O-20: High Temperature in-SEM Nanoindentation of TRISO SiC Coatings
||Alexander Leide, Eric Hintsala, Dong Liu
|On-Site Speaker (Planned)
Measuring local properties of TRISO fuel particles at their operating temperature is a notoriously difficult challenge which must be overcome to fully understand the performance of this fuel and the operation of high temperature reactors. In-SEM nanoindentation has been performed using a Bruker PI-89 Picoindenter to measure the hardness and elastic modulus of the SiC layer of TRISO particles at room temperature and 1000 °C, continuously measuring properties as a function of contact depth. Post-indentation analysis shows different deformation mechanisms, with plastic deformation at 1000 °C and minimal fracture, which correlates to the significantly lower hardness. Oxidation of pyrolytic carbon coating layers occurred above 800 °C, which was investigated using plasma-FIB cross-sections, which also revealed the structure of the interfaces between SiC and inner and outer pyrolytic carbon. The combination of high temperature micromechanical property measurement and microstructural analysis is a powerful tool for evaluating advanced nuclear materials.
||Nuclear Materials, Mechanical Properties, Ceramics