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Fabrication of UO2-BeO composite pellets with superior thermal conductivity based on multi-parameter theoretical analyses.
- Source :
-
Journal of Nuclear Materials . Dec2020, Vol. 542, pN.PAG-N.PAG. 1p. - Publication Year :
- 2020
-
Abstract
- • Combing theoretical analyses and experimental investigations, the fabrication process of UO 2 -BeO was optimized. • Through this method, BeO density was effectively improved and UO 2 /BeO interfacial thermal resistance was decreased. • The thermal conductivity of UO 2 -BeO fabricated by this optimized method was improved by 89%. In this paper, the fabrication process of UO 2 -BeO composite pellets was optimized for improving the thermal conductivity based on multi-parameter theoretical analyses and experimental investigations. It was found that the density of BeO and UO 2 /BeO interfacial thermal resistance (ITR) are crucial parameters that affect the thermal conductivity of UO 2 -BeO. To effectively increase BeO density and decrease UO 2 /BeO ITR, the fabrication method of pressureless sintering with a spheroidizing process was proposed. Through this method, UO 2 -BeO composite with high thermal conductivity was obtained. 89.2% and 71.4% enhancements of the thermal conductivity over UO 2 were achieved at room temperature and 673 K, respectively. This enhancement is higher than all the reported results in the previous literatures that fabricated UO 2 -BeO using normal sintering temperatures (<2023 K). The results of finite element modelling showed that the centerline temperatures of our fabricated pellets in the reactor decreased remarkably compared with UO 2 fuel, which would significantly improve the safety of the reactor. [ABSTRACT FROM AUTHOR]
- Subjects :
- *INTERFACIAL resistance
*WOOD pellets
*THERMAL conductivity
*PELLETIZING
Subjects
Details
- Language :
- English
- ISSN :
- 00223115
- Volume :
- 542
- Database :
- Academic Search Index
- Journal :
- Journal of Nuclear Materials
- Publication Type :
- Academic Journal
- Accession number :
- 146681823
- Full Text :
- https://doi.org/10.1016/j.jnucmat.2020.152533