Microstructural and Oxidation Effects of Nb Additions to U3Si2

Robles, Geronimo; White, Joshua T.; Widgeon Paisner, Scarlett; Sooby, Elizabeth S.

doi:10.3390/met14111239

Title: Microstructural and Oxidation Effects of Nb Additions to U3Si2

Journal Article · 30 October 2024 · Metals

DOI: https://doi.org/10.3390/met14111239 · OSTI ID:2475898

Robles, Geronimo; White, Joshua T.; Widgeon Paisner, Scarlett;

U3Si2 is a long term, accident-tolerant nuclear fuel candidate for light-water reactors because of its superior thermal conductivity and increased uranium density when compared to traditional uranium dioxide (UO2). While reducing internal thermal stresses and increasing efficiency, U3Si2 exhibits energetic oxidation during certain off-normal and accident scenarios, which include coolant or steam exposure. To mitigate this, Nb is investigated as an alloy constituent to enhance corrosion resistance and increase mechanical strength. The work presented investigates the response of Nb-alloyed U3Si2 to steam atmospheres. A thermogravimetric analysis is conducted in flowing steam to T > 1000 °C to assess oxidation resistance. The phase characterization of as-melted, thermally annealed and post-oxidation compositions with up to 12 vol% Nb by powder X-ray diffraction, scanning electron microscopy, and energy dispersive spectroscopy is reported.

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Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0002576; NA0004107

OSTI ID:: 2475898

Journal Information:: Metals, Journal Name: Metals Journal Issue: 11 Vol. 14; ISSN 2075-4701; ISSN MBSEC7

Publisher:: MDPI AGCopyright Statement

Country of Publication:: Switzerland

Language:: English

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