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The presence of high-density defects is rarely observed in bulk 3 mol% yttria-stabilized tetragonal zirconia polycrystal (3Y-TZP) ceramics obtained through conventional pressureless sintering. In the present work, fine-grained dense 147 nm 3Y-TZP ceramics were prepared by pressureless sintering of commercial 0.25 wt% alumina-doped zirconia powders at 1300 . A novel discovery was reported in which large amounts of defects were present in the grain interiors of the sample. The phenomenon was further examined using three types of powder samples, and the reasons for defect formation were investigated by microstructural characterization using high-resolution transmission electron microscopy (HRTEM) analysis and Rietveld refinement. The results confirmed the essential dependence of the defect formation on the alumina addition. The authors attributed the defect formation to the significant difference in ionic radii of the solvent and solute during the dissolution of alumina into the zirconia lattice. The sintering kinetics were proposed to be enhanced by the presence of substantial defects, which consequently favored the low-temperature sintering of the alumina-doped zirconia ceramics.


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Defects in the grain interiors of 3 mol% yttria-stabilized tetragonal zirconia polycrystal ceramics with 0.25 wt% alumina

Show Author's information Yan Xiong1( )Lian Luo1Yao Cheng2Zhi Liu3Qi Liu3Weimin Wang4Wei Ji4( )
School of Materials & Chemical Engineering, Hubei Province Key Laboratory of Green Materials for Light Industry, Hubei University of Technology, Wuhan 430068, China
Fujian Institute of Research on the Structure of Mater, Chinese Academy of Sciences, Fuzhou 350002, China
Jiangxi Provincial Engineering Research Center for Multifunction Zirconia Materials, Jiangxi Size Materials Co., Ltd., Jiujiang 332500, China
State Key Laboratory of Advance Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China

Abstract

The presence of high-density defects is rarely observed in bulk 3 mol% yttria-stabilized tetragonal zirconia polycrystal (3Y-TZP) ceramics obtained through conventional pressureless sintering. In the present work, fine-grained dense 147 nm 3Y-TZP ceramics were prepared by pressureless sintering of commercial 0.25 wt% alumina-doped zirconia powders at 1300 . A novel discovery was reported in which large amounts of defects were present in the grain interiors of the sample. The phenomenon was further examined using three types of powder samples, and the reasons for defect formation were investigated by microstructural characterization using high-resolution transmission electron microscopy (HRTEM) analysis and Rietveld refinement. The results confirmed the essential dependence of the defect formation on the alumina addition. The authors attributed the defect formation to the significant difference in ionic radii of the solvent and solute during the dissolution of alumina into the zirconia lattice. The sintering kinetics were proposed to be enhanced by the presence of substantial defects, which consequently favored the low-temperature sintering of the alumina-doped zirconia ceramics.

Keywords: microstructure, defect, alumina addition, 3 mol% yttria-stabilized tetragonal zirconia polycrystal (3Y-TZP) ceramics

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Received: 19 December 2023
Revised: 20 February 2024
Accepted: 22 February 2024
Published: 30 April 2024
Issue date: April 2024

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© The Author(s) 2024.

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Acknowledgements

This work was financially supported by the National Key R&D Program of China (No. 2021YFB3701400), the National Natural Science Foundation of China (Nos. 92163208 and 52322207), and the Foundation of Hubei Province Key Laboratory of Green Materials for Light Industry, Hubei University of Technology.

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This is an open access article under the terms of the Creative Commons Attribution 4.0 International License (CC BY 4.0, http://creativecommons.org/licenses/by/4.0/).

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