Onset conditions for flash sintering of UO2

In this work, flash sintering was demonstrated on stoichiometric and non-stoichiometric uranium dioxide pellets at temperatures ranging from room temperature (26°C) up to 600°C. The onset conditions for flash sintering were determined for three stoichiometries (UO2.00, UO2.08, and UO2.16) and analyz...

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Bibliographic Details
Published in:Journal of nuclear materials 2017-09, Vol.493, p.264-270
Main Authors: Raftery, Alicia M., Pereira da Silva, João Gustavo, Byler, Darrin D., Andersson, David A., Uberuaga, Blas P., Stanek, Christopher R., McClellan, Kenneth J.
Format: Article
Language:English
Subjects:
Field assisted sintering
Flash sintering
Nuclear Fuel
NUCLEAR FUEL CYCLE AND FUEL MATERIALS
Pellets
Resistance sintering
Stoichiometry
Temperature
Thermal runaway
Uranium dioxide
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Summary:In this work, flash sintering was demonstrated on stoichiometric and non-stoichiometric uranium dioxide pellets at temperatures ranging from room temperature (26°C) up to 600°C. The onset conditions for flash sintering were determined for three stoichiometries (UO2.00, UO2.08, and UO2.16) and analyzed against an established thermal runaway model. The presence of excess oxygen was found to enhance the flash sintering onset behavior of uranium dioxide, lowering the field required to flash and shortening the time required for a flash to occur. The results from this study highlight the effect of stoichiometry on the flash sintering behavior of uranium dioxide and will serve as the foundation for future studies on this material.
ISSN:0022-3115
1873-4820
DOI:10.1016/j.jnucmat.2017.06.022