Atomistic level study of Ce3Si2 oxidation as an accident tolerant nuclear fuel surrogate

Atomistic level study of Ce3Si2 oxidation as an accident tolerant nuclear fuel surrogate

•Intermetallic silicide compounds being pursued for accident tolerant nuclear fuels programmes globally.•Oxidation mechanisms in Ce-Si as a surrogate for U-Si system reported for first time using atomistic scale techniques.•Material decomposes from micron sized grains, forming complex oxide nanostru...

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Veröffentlicht in:Corrosion science 2020-03, Vol.164, p.108332, Article 108332
Hauptverfasser: Harrison, R.W., Worth, R.N., Buckley, J., Abram, T.
Format: Artikel
Sprache:eng
Schlagworte:
Accident tolerant
Accidents
Cerium oxides
Fission products
Intermetallic
Materials Science
Materials Science, Multidisciplinary
Metallurgy & Metallurgical Engineering
Nuclear fission
Nuclear fuel
Nuclear fuels
Oxidation
Science & Technology
Silicide
Silicon dioxide
Spallation
Technology
Uranium silicide
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Beschreibung
Zusammenfassung:•Intermetallic silicide compounds being pursued for accident tolerant nuclear fuels programmes globally.•Oxidation mechanisms in Ce-Si as a surrogate for U-Si system reported for first time using atomistic scale techniques.•Material decomposes from micron sized grains, forming complex oxide nanostructure causing pulverisation of material.•Passivation of nanoscale Si regions by CeO2 leads to the incomplete oxidation. The oxidation mechanisms of Ce3Si2 (as a surrogate for U3Si2 accident tolerant nuclear fuel) have been studied to 750 °C in flowing air. Discrepancies between the terminal and theoretical mass gains for complete oxidation, similar to previous works on the U3Si2 system are attributed to incomplete oxidation of Si, which forms amorphous SiO2 and regions of nano-crystalline free Si. Nano-grained (
ISSN:0010-938X
1879-0496
DOI:10.1016/j.corsci.2019.108332