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- W4313442955 endingPage "154219" @default.
- W4313442955 startingPage "154219" @default.
- W4313442955 abstract "Tristructural isotropic (TRISO) nuclear fuel particles contain a layered spherical shell designed to retain fission products; however, failure occurs in rare cases—commonly initiated in the porous pyrocarbon buffer layer. Achieving a comprehensive understanding of the buffer-initiated failure mechanisms requires detailed characterization of the buffer porosity and its heterogeneous distribution across multiple length scales. We performed FIB-SEM tomography across the buffer layer thickness (∼100 µm) to produce 3D reconstructions of the buffer microstructure with 50 nm spatial resolution. We found an average overall porosity of ∼14%, which does not solely account for the low density of the buffer (50% of the theoretical density). Additionally, the local porosity and its fluctuation increase from the kernel interface towards the inner pyrocarbon (IPyC) layer, which we attribute to the chemical vapor deposition process conditions during the TRISO particle fabrication. Detailed characterization of the porous microstructure—including analysis of the pore size, distribution, shape, and orientation—provides insight into the process-structure-property-performance relations of TRISO nuclear fuel particles and will inform multiscale models designed to predict the failure of TRISO particles under irradiation." @default.
- W4313442955 created "2023-01-06" @default.
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- W4313442955 date "2023-02-01" @default.
- W4313442955 modified "2023-09-27" @default.
- W4313442955 title "Microstructural heterogeneity of the buffer layer of TRISO nuclear fuel particles" @default.
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- W4313442955 doi "https://doi.org/10.1016/j.jnucmat.2022.154219" @default.
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