Dense nanocrystalline UO 2+ x fuel pellets synthesized by high pressure spark plasma sintering

Yao, Tiankai; Scott, Spencer M.; Xin, Guoqing; Gong, Bowen; Lian, Jie

doi:10.1111/jace.15289

Dense nanocrystalline UO _{2+ x} fuel pellets synthesized by high pressure spark plasma sintering

Journal Article · Wed Nov 01 00:00:00 EDT 2017 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/jace.15289· OSTI ID:1408189

^[1]; ^[1]; Xin, Guoqing ^[1]; Gong, Bowen ^[1]; Lian, Jie ^[1]

Department of Mechanical, Aerospace, and Nuclear Engineering Rensselaer Polytechnic Institute Troy New York

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.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: NONE; NE0008440

OSTI ID:: 1408189

Alternate ID(s):: OSTI ID: 1541598

Journal Information:: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 3 Vol. 101; ISSN 0002-7820

Publisher:: Wiley-BlackwellCopyright Statement

Country of Publication:: United States

Language:: English

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