Formation mechanism and roles of oxygen vacancies in melt-grown Al2O3/GdAlO3/ZrO2 eutectic ceramic by laser 3D printing

Haifang LIU; Haijun SU; Zhonglin SHEN; Hao JIANG; Di ZHAO; Yuan LIU; Yinuo GUO; Xiang LI; Min GUO; Jun ZHANG; Lin LIU; Hengzhi FU

doi:10.1007/s40145-022-0645-8

Journal of Advanced Ceramics 2022, 11(11): 1751-1763 https://doi.org/10.1007/s40145-022-0645-8

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Open Access | Issue | Published: 05 November 2022

Formation mechanism and roles of oxygen vacancies in melt-grown Al₂O₃/GdAlO₃/ZrO₂ eutectic ceramic by laser 3D printing

Show Author's Information Hide Author's Information Haifang LIU^{^a}, Haijun SU^{^a^,^b}(

), Zhonglin SHEN^{^a^,^b}, Hao JIANG^{^a}, Di ZHAO^{^a}, Yuan LIU^{^a}, Yinuo GUO^{^a^,^b}, Xiang LI^{^a}, Min GUO^{^a}, Jun ZHANG^{^a}, Lin LIU^{^a}, Hengzhi FU^{^a}

a State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China

b Shenzhen Research Institute of Northwestern Polytechnical University, Shenzhen 518057, China

Keywords:

microstructure, mechanical property, oxygen vacancy, oxide eutectic ceramic, laser three-dimensional (3D) printing

Cite this article:

LIU H, SU H, SHEN Z, et al. Formation mechanism and roles of oxygen vacancies in melt-grown Al₂O₃/GdAlO₃/ZrO₂ eutectic ceramic by laser 3D printing. Journal of Advanced Ceramics, 2022, 11(11): 1751-1763. https://doi.org/10.1007/s40145-022-0645-8

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Abstract Full text About this article

Abstract

Laser three-dimensional (3D) printing has become a significant technique to fabricate high-performance Al₂O₃-based eutectic ceramics based on melt growth. However, oxygen vacancies are inevitable crystal defects during this process, and their formation mechanism and roles in the as-deposited ceramics are still unclear. In this paper, Al₂O₃/GdAlO₃/ZrO₂ ternary eutectic ceramics were prepared by laser 3D printing, and the formation mechanism of the oxygen vacancies was revealed by conducting a well-designed annealing experiment. In addition, the effects of the oxygen vacancies on the structure and mechanical property of the as-solidified eutectic ceramic were investigated. The formation of oxygen vacancies is revealed to be a result of the transfer of oxygen atoms from the oxide ceramic to the oxygen-deficient atmosphere by means of vacancy migration mechanism. Besides, the presence of oxygen vacancies has no obvious effects on crystalline structure and microstructure of the additively manufactured eutectic ceramic. However, the chemical bond property changes to some extent due to the formation of these crystal defects, which may affect the mechanical property of the as-deposited eutectic ceramic. It is found that the hardness decreases by 3.9%, and the fracture toughness increases by 13.3% after removing the oxygen vacancies. The results may provide a potential strategy to regulate the mechanical property of the oxide ceramic materials.

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Formation mechanism and roles of oxygen vacancies in melt-grown Al₂O₃/GdAlO₃/ZrO₂ eutectic ceramic by laser 3D printing

Show Author's information Hide Author's Information Haifang LIU^{^a}, Haijun SU^{^a^,^b}(

), Zhonglin SHEN^{^a^,^b}, Hao JIANG^{^a}, Di ZHAO^{^a}, Yuan LIU^{^a}, Yinuo GUO^{^a^,^b}, Xiang LI^{^a}, Min GUO^{^a}, Jun ZHANG^{^a}, Lin LIU^{^a}, Hengzhi FU^{^a}

a State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China

b Shenzhen Research Institute of Northwestern Polytechnical University, Shenzhen 518057, China

Abstract

Keywords: microstructure, mechanical property, oxygen vacancy, oxide eutectic ceramic, laser three-dimensional (3D) printing

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Acknowledgements

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Publication history

Received: 15 February 2022

Revised: 20 July 2022

Accepted: 17 August 2022

Published: 05 November 2022

Issue date: November 2022

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (52130204, 52174376, and 51822405); Guangdong Basic and Applied Basic Research Foundation (2021B1515120028); Science and Technology Innovation Team Plan of Shaanxi Province (2021TD-17); The Youth Innovation Team of Shaanxi Universities, Key R&D Program of Shaanxi Province (2019ZDLGY04-04); Joint Research Funds of the Department of Science & Technology of Shaanxi Province and NWPU (2020GXLH-Z-024); Fundamental Research Funds for the Central Universities (D5000210902); and Innovation Foundation for Doctor Dissertation of Northwestern Polytechnical University (CX2021056, CX2021066, and CX2022033).

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