Dense nanocrystalline UO 2+ x fuel pellets synthesized by high pressure spark plasma sintering
Abstract
Abstract Nanocrystalline UO 2+ x powders are prepared by high‐energy ball milling and subsequently consolidated into dense fuel pellets (>95% of theoretical density) under high pressure (750 MP a) by spark plasma sintering at low sintering temperatures (600°C‐700°C). The grain size achieved in the dense nano‐ceramic pellets varies within 60‐160 nm as controlled by sintering temperature and duration. The sintered fuel pellets are single phase UO 2+ x with hyper‐stoichiometric compositions as derived by X‐ray diffraction, and micro‐Raman measurements indicate that random oxygen interstitials and Willis clusters dominate the single phase nano‐sized oxide pellets of UO 2.03 and UO 2.11 , respectively. The thermal conductivities of the densified nano‐sized oxide fuel pellets are measured by laser flash, and the fuel stoichiometry displays a dominant effect in controlling thermal transport properties. A reduction in thermal conductivity is also observed for the dense nano‐sized pellets as compared with micron‐sized counterparts reported in the literature. The correlation among the SPS sintering parameters—microstructure control—properties is established, and the nano‐sized UO 2+ x pellets with controlled microstructure can serve as the model systems for fundamental understandings of fuel behaviors and obtaining critical experimental data for multi‐physics MARMOT model validation.
- Authors:
-
[1];
[1];
- Department of Mechanical, Aerospace, and Nuclear Engineering Rensselaer Polytechnic Institute Troy New York
- Publication Date:
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1408189
- Resource Type:
- Publisher's Accepted Manuscript
- Journal Name:
- Journal of the American Ceramic Society
- Additional Journal Information:
- Journal Name: Journal of the American Ceramic Society Journal Volume: 101 Journal Issue: 3; Journal ID: ISSN 0002-7820
- Publisher:
- Wiley-Blackwell
- Country of Publication:
- United States
- Language:
- English
Citation Formats
Yao, Tiankai, Scott, Spencer M., Xin, Guoqing, Gong, Bowen, and Lian, Jie. Dense nanocrystalline UO 2+ x fuel pellets synthesized by high pressure spark plasma sintering. United States: N. p., 2017.
Web. doi:10.1111/jace.15289.
Yao, Tiankai, Scott, Spencer M., Xin, Guoqing, Gong, Bowen, & Lian, Jie. Dense nanocrystalline UO 2+ x fuel pellets synthesized by high pressure spark plasma sintering. United States. https://doi.org/10.1111/jace.15289
Yao, Tiankai, Scott, Spencer M., Xin, Guoqing, Gong, Bowen, and Lian, Jie. Wed .
"Dense nanocrystalline UO 2+ x fuel pellets synthesized by high pressure spark plasma sintering". United States. https://doi.org/10.1111/jace.15289.
@article{osti_1408189,
title = {Dense nanocrystalline UO 2+ x fuel pellets synthesized by high pressure spark plasma sintering},
author = {Yao, Tiankai and Scott, Spencer M. and Xin, Guoqing and Gong, Bowen and Lian, Jie},
abstractNote = {Abstract Nanocrystalline UO 2+ x powders are prepared by high‐energy ball milling and subsequently consolidated into dense fuel pellets (>95% of theoretical density) under high pressure (750 MP a) by spark plasma sintering at low sintering temperatures (600°C‐700°C). The grain size achieved in the dense nano‐ceramic pellets varies within 60‐160 nm as controlled by sintering temperature and duration. The sintered fuel pellets are single phase UO 2+ x with hyper‐stoichiometric compositions as derived by X‐ray diffraction, and micro‐Raman measurements indicate that random oxygen interstitials and Willis clusters dominate the single phase nano‐sized oxide pellets of UO 2.03 and UO 2.11 , respectively. The thermal conductivities of the densified nano‐sized oxide fuel pellets are measured by laser flash, and the fuel stoichiometry displays a dominant effect in controlling thermal transport properties. A reduction in thermal conductivity is also observed for the dense nano‐sized pellets as compared with micron‐sized counterparts reported in the literature. The correlation among the SPS sintering parameters—microstructure control—properties is established, and the nano‐sized UO 2+ x pellets with controlled microstructure can serve as the model systems for fundamental understandings of fuel behaviors and obtaining critical experimental data for multi‐physics MARMOT model validation.},
doi = {10.1111/jace.15289},
journal = {Journal of the American Ceramic Society},
number = 3,
volume = 101,
place = {United States},
year = {2017},
month = {11}
}
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