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In-situ synthesized nanocrystalline UO2/SiC composite with superior thermal conductivity
- Source :
- Ceramics International. 47:31160-31167
- Publication Year :
- 2021
- Publisher :
- Elsevier BV, 2021.
-
Abstract
- In this study, a novel UO2/SiC nanocomposite pellet was constructed via in-situ hydrothermal synthesis and SPS. Such method could avoid the problem of traditional mechanical mixing that could obtained the molecular level mixing during a chemical process. Using such method, SiC was dispersed uniformly in the UO2 matrix. Its thermal conductivity is significantly higher than those of UO2 pellet fabricated using hydro-thermally prepared powder and traditional UO2 pellets at both working temperature (400 °C) and near-accident temperature (1000 °C). The thermal conductivity of UO2/SiC nanocomposite pellet increased 23.7 % over traditional UO2 and 48.9 % over UO2 pellet fabricated using hydro-thermally prepared powder at 400 °C. It also increased 33.6 % over traditional UO2 and 74.8 % over UO2 pellet fabricated using hydro-thermally prepared powder at 1000 °C. These advantages are expected to maintain high thermal conductivity of fuels, enhance heat transferring efficiency of reactors, and minimize risks of pellet failure in the entire fuel life cycle.
- Subjects :
- Nanocomposite
Materials science
Process Chemistry and Technology
Composite number
Mixing (process engineering)
Pellets
Nanocrystalline material
Surfaces, Coatings and Films
Electronic, Optical and Magnetic Materials
Thermal conductivity
Pellet
Materials Chemistry
Ceramics and Composites
Hydrothermal synthesis
Composite material
Subjects
Details
- ISSN :
- 02728842
- Volume :
- 47
- Database :
- OpenAIRE
- Journal :
- Ceramics International
- Accession number :
- edsair.doi...........dc968c78f6f6004f447bb9a65685e786