Stability properties and microstructure properties of microwave-sintered CeO₂ doped zirconia ceramics
Ling, Yeqing; Hao, Xiandong; Gui, Yuxi; Qiu, Hongju; Li, Qiannan; Zheng, Hewen; Omran, Mamdouh; Gao, Lei; Chen, Jin; Chen, Guo (2021-06-29)
Ling, Y., Hao, X., Gui, Y., Qiu, H., Li, Q., Zheng, H., Omran, M., Gao, L., Chen, J., & Chen, G. (2021). Stability properties and microstructure properties of microwave-sintered CeO2 doped zirconia ceramics. Ceramics International. https://doi.org/10.1016/j.ceramint.2021.06.234
© 2021 Elsevier Ltd and Techna Group S.r.l. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/.
https://creativecommons.org/licenses/by-nc-nd/4.0/
https://urn.fi/URN:NBN:fi-fe2021081843584
Tiivistelmä
Abstract
Nanosized CeO₂–ZrO₂ powders prepared by atmospheric pressure pyrolysis were used as raw materials to prepare CeO₂–ZrO₂ ceramics using microwave sintering. The samples were characterised using bulk density measurements, X-ray diffraction (XRD), Fourier Transform Infrared Spectrometer (FT-IR), Raman, and scanning electron microscopy (SEM). The purpose was to determine the optimised microwave sintering process for CeO₂–ZrO₂ ceramics and reveal the corresponding mechanism. The results show that with a CeO₂ addition content above 5 mol%, the tetragonal phase peak appeared obviously in the sample. The results show that the tetragonal phase peak appears when the CeO₂ content is more than 5 mol%. The dopants, namely CeO₂, have reduced the solid solution’s phase transformation temperature with the assistance of microwave heating. Additionally, the grain size of the CeO₂–ZrO₂ ceramics has shown a negative relationship with Ce content at a temperature of 900 °C. The reason is that the rapid sintering due to microwave sintering and the oxygen vacancies generated by CeO₂ can effectively inhibit grain growth. The regulation mechanism on microwave sintering of CeO₂–ZrO₂ ceramic was clarified, and the technical prototype of controlled prepared CeO₂–ZrO₂ ceramics by microwave sintering was constructed.
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