| About this Abstract |
| Meeting |
2022 TMS Annual Meeting & Exhibition
|
| Symposium
|
Advanced Characterization and Modeling of Nuclear Fuels: Microstructure, Thermo-physical Properties
|
| Presentation Title |
High-resolution Thermal Conductivity and Thermal Boundary Resistance Mapping in TRISO |
| Author(s) |
Dong (Lilly) Liu |
| On-Site Speaker (Planned) |
Dong (Lilly) Liu |
| Abstract Scope |
An accurate measurement of the local thermal conductivity (TC) and thermal boundary resistance (TBR) is critical for understanding the heat transfer in nuclear fuels. In particularly for TRISO (tristructural isotropic coated particles), due to its multi-layer coating system, these are very challenging to measure due to the large range of thermal conductivity (TC) values for SiC, PyC and buffer layer from a few W/m·K to about 20 W/m·K, and the sizable TBRs between each of the layers. In this work, a thermal reflectance-based method has been developed to measure/map the thermal conductivity of each individual layers in TRISO coatings on polished cross-sections as well as in un-polished whole particles. The interfaces between coatings, especially when voids/pores are present (e.g., between the IPyC and Buffer layer), the TBR is increased. A numerical model has been built to simulate the heat flow in TRISO based on the experimental measurements. |
| Proceedings Inclusion? |
Planned: |
| Keywords |
Characterization, Nuclear Materials, Composites |