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One of the main challenges in the study of TRISO (Tristructural Isotropic)coated fuel particles is the understanding of the diffusion of fission productsthrough SiC. Among the elements produced inside the uranium kernel, it has beensuggested that Pd might enhance the diffusion of other fission products. Inthis work we have studied the interaction between Pd and SiC. We have observedthat as Pd diffuses it can change the chemical composition and microstructureof SiC. Electron Backscattered Diffraction (EBSD) analysis showed that Pdincreased the amount of high angle grain boundaries from 47 to 59%.Furthermore, we have observed that as Pd diffused, it changed the compositionof SiC by leaving a trail of excess carbon at the grain boundary. This changein localized chemical composition and microstructure suggests a grain boundarycomplexion transition induced by Pd and a new way in which Pd can lead tofaster diffusion routes for other fission products.

Effect of palladium on the microstructure and grain boundary complexions in SiC