Characterization of PyC/SiC Interfaces with FIB-SEM Tomography

Tristructural-isotropic (TRISO) fuel is being considered for multiple reactor designs due to its exceptional performance. This work studies pyrocarbon (PyC) and silicon carbide (SiC) substrates that are near-representative of the inner pyrocarbon (IPyC) and SiC in TRISO fuel. Focused ion beam (FIB)-scanning electron microscopy (SEM) tomography was used to understand the influence of different processing routes on the PyC/SiC interface structure. Additionally, this work outlines a methodology for characterizing the IPyC/SiC interface when considering fission product accommodation and retention in TRISO fuel design. The high-fidelity images collected with FIB-SEM tomography can be used to achieve a more in-depth interpretation of microstructural parameters and pore-shape analysis that can inform simulations and processing. (C) 2020 Elsevier B.V. All rights reserved.

Automated summary

This study investigates the interface structure characteristics of pyrocarbon and silicon carbide in TRISO fuel, proposing a method for characterizing this interface. High-fidelity images collected using FIB-SEM tomography can provide a more in-depth interpretation of microstructural parameters and pore-shape analysis.