University of Oulu

Ling, Y., Hao, X., Zhang, S., Chen, J., Gao, L., Omran, M., & Chen, G. (2022). Crystal structure and morphology of CeO2 doped stabilized zirconia ceramics under high-frequency microwave field sintering. Ceramics International, 48(8), 10547–10554. https://doi.org/10.1016/j.ceramint.2021.12.266

Crystal structure and morphology of CeO₂ doped stabilized zirconia ceramics under high-frequency microwave field sintering

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Author: Ling, Yeqing1; Hao, Xiandong1; Zhang, Sirui1;
Organizations: 1Key Laboratory of Green-Chemistry Materials in University of Yunnan Province, Yunnan Minzu University, Kunming, 650500, PR China
2Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming University of Science and Technology, Kunming, 650500, PR China
3Faculty of Technology, University of Oulu, Finland
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe202201209516
Language: English
Published: Elsevier, 2022
Publish Date: 2023-12-28
Description:

Abstract

Under high-frequency microwave irradiation, zirconia ceramics were prepared by sintering nano-CeO₂ (Ce = 7 mol%) doped zirconia powder. The different effects of temperature environment on the phase structure transformation, surface functional groups, microstructure, growth process, and density of doped zirconia were analyzed, and the optimized microwave sintering process for zirconia was determined. The experimental results reveal that the tetragonal phase of zirconia is positively correlated with the temperature when the temperature reaches about 1100 °C in the studied range. The reason is that the grain grows with the increase of sintering temperature, and the surface energy of grain decreases, which leads to the fluctuation of tetragonal phase content. The density of zirconia reaches 98.03% at 1300 °C, and the growth activation energy is 27.40 kJ/mol. There is no abnormal growth of zirconia particles, and the phase transition temperature decreases, which is attributed to the efficient heating of microwave and the incorporation of nano-ceria stabilizer.

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Series: Ceramics international
ISSN: 0272-8842
ISSN-E: 1873-3956
ISSN-L: 0272-8842
Volume: 48
Issue: 8
Pages: 10547 - 10554
DOI: 10.1016/j.ceramint.2021.12.266
OADOI: https://oadoi.org/10.1016/j.ceramint.2021.12.266
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Subjects:
Funding: Financial supports from the National Natural Science Foundation of China (No: 51764052), the scientific research foundation of Yunnan Education Department (No: 2021Y657).
Copyright information: © 2021. 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/