| About this Abstract |
| Meeting |
2023 TMS Annual Meeting & Exhibition
|
| Symposium
|
Late News Poster Session
|
| Presentation Title |
O-20: High Temperature in-SEM Nanoindentation of TRISO SiC Coatings |
| Author(s) |
Alexander Leide, Eric Hintsala, Dong Liu |
| On-Site Speaker (Planned) |
Alexander Leide |
| Abstract Scope |
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. |
| Proceedings Inclusion? |
Undecided |
| Keywords |
Nuclear Materials, Mechanical Properties, Ceramics |