|About this Abstract
||2022 TMS Annual Meeting & Exhibition
||Mechanical Behavior and Degradation of Advanced Nuclear Fuel and Structural Materials
||Microscale Thermal Conductivity and Residual Stress Measurements in TRISO Particle Coatings
||Alexander Leide, Miriam Mowat, James Pomeroy, Roland Simon, Mark Davies, Dave Goddard, Martin Kuball, Dong Liu
|On-Site Speaker (Planned)
Tristructural isotropic (TRISO) nuclear fuel particles consist of a central fuel kernel and a series of pyrolytic carbon and silicon carbide coatings to create a multi-layer sphere approximately 1 mm in diameter. These coatings are typically only tens of microns thick, making measuring their properties challenging using conventional methods.
Thermal conductivity of individual TRISO coating layers has been measured at room and elevated temperatures using time domain thermoreflectance (TDTR) with ~5 Ám spatial resolution on polished cross sections. Similar measurements in the frequency domain (FDTR) probe millimetre scale heat transfer, giving information on the thermal barrier resistance of coating layer interfaces in complete TRISO particles.
Additionally, residual stress measurements have been made in the coating layers of TRISO particles using a ring-core focussed ion beam milling technique, finding tensile hoop stress in PyC and compressive hoop stress in SiC, of similar magnitude to those predicted to arise during operation.
||Nuclear Materials, Ceramics, Characterization