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Densification of nano-CeO2 ceramics as nuclear oxide surrogate by spark plasma sintering |
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| Authors: | Kwanghoon Choi Robert D Maiani Zuhair A Munir |
| Affiliation: | a Department of Chemical Engineering and Materials Science, University of California, Davis, CA 95616, United States b Materials and Fuels, Idaho National Laboratory, Idaho Falls, ID 83415, United States c National Nuclear Security Administration, Washington, DC 20585, United States |
| Abstract: | The sintering and resulting microstructure of nano-grained CeO2 ceramics were investigated as functions of the spark plasma sintering (SPS) parameters. Ceria powders could be sintered to a relative density over 97% with a grain size of about 30 nm. The applied uniaxial pressure during sintering had a significant effect on densification. The combination of high pressure and fast heating rate produces a marked reduction in the sintering temperature to densify CeO2 with very limited grain growth. Heating rate and holding time, however, had insignificant effect on density but a measurable effect on grain size. |
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