University of Oulu

Kangqiang Li, Jin Chen, Jinhui Peng, Sivasankar Koppala, Mamdouh Omran, Guo Chen, One-step preparation of CaO-doped partially stabilized zirconia from fused zirconia, Ceramics International, Volume 46, Issue 5, 2020, Pages 6484-6490, ISSN 0272-8842, https://doi.org/10.1016/j.ceramint.2019.11.129

One-step preparation of CaO-doped partially stabilized zirconia from fused zirconia

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Author: Li, Kangqiang1; Chen, Jin1,2; Peng, Jinhui1,2;
Organizations: 1Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming, 650093, PR China
2Key Laboratory of Green-Chemistry Materials in University of Yunnan Province, Yunnan Minzu University, Kunming, 650500, PR China
3Process Metallurgy Research Group, Faculty of Technology, University of Oulu, Finland
Format: article
Version: accepted version
Access: embargoed
Persistent link: http://urn.fi/urn:nbn:fi-fe2020040914230
Language: English
Published: Elsevier, 2020
Publish Date: 2021-11-16
Description:

Abstract

Partially stabilized zirconia (PSZ) replaces the widespread applications of full stabilized zirconia (FSZ) on ceramics materials and refractories materials, attributed to its excellent properties including small coefficient of thermal expansion, low thermal conductivity and good thermal shock resistance. In this work, CaO-doped partially stabilized zirconia (CaO-PSZ) was optimizedly prepared from fused zirconia through conventional roasting. Meanwhile, the effects of roasting temperature and duration time on stability properties were explored to determine the stability parameters of the prepared CaO-PSZ. Results indicated that the zirconia stability rate synchronously improved with the decrease of roasting temperature and duration time, which was attributed to that the martensitic transformation of fused zirconia with volume change plays a toughening effect, further rendering the change of zirconia stability properties. XRD patterns verified the martensitic transformation, representing by cubic ZrO₂ phase (c-ZrO₂) in raw fused zirconia was partially transformed into monoclinic ZrO₂ phase (m-ZrO₂) at 1450 °C for 4 h. Moreover, the phase transition law of fused zirconia was revealed through SEM and EDAX characterization for the raw fused zirconia and the prepared CaO-PSZ. SEM patterns showed acicular patterns of grains and round fine particles clustered at grain boundaries, indicating that CaO stabilizer precipitated on grain boundaries and rendered the crystal structure enhanced, which the result was consistent with EDAX analysis. This work can lay a significant foundation for applications of microwave heating on the preparation of partially stabilized zirconia (PSZ) from fused zirconia.

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Series: Ceramics international
ISSN: 0272-8842
ISSN-E: 1873-3956
ISSN-L: 0272-8842
Volume: 46
Issue: 5
Pages: 6484 - 6490
DOI: 10.1016/j.ceramint.2019.11.129
OADOI: https://oadoi.org/10.1016/j.ceramint.2019.11.129
Type of Publication: A1 Journal article – refereed
Field of Science: 216 Materials engineering
Subjects:
Funding: Financial support from the National Natural Science Foundation of China (Grant No. 51764052) and Innovative Research Team (in Science and Technology) in University of Yunnan Province.
Copyright information: © 2019. 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/