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Achieving full densification of some ceramic materials, such as Y2O3, without sintering aids by spark plasma sintering (SPS) is a great challenge when plastic deformation contributes limitedly to the densification as the yield stress of the material at an elevated temperature is higher than the applied sintering pressure. Herein, we demonstrate that particle fracture and rearrangement is an effective strategy to promote the densification during the pressure-assisted sintering process. Specifically, Y2O3 nanocrystalline powders composed of nanorod and near-spherical particles were synthesized and sintered at various temperatures by the SPS. The results show that the relative density of the ceramics prepared by the nanorod powders is higher than the density of the ceramics from the near-spherical powders after 600 ℃ due to the fracture and rearrangement of the nanorods at low temperatures, which leads to the decrease of particle size and the increase of density and homogeneity. Based on this novel densification mechanism, ultrafine-grained Y2O3 transparent ceramics with good optical and mechanical properties were fabricated successfully from the nanorod powders.


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An effective strategy for preparing transparent ceramics using nanorod powders based on pressure-assisted particle fracture and rearrangement

Show Author's information Zhangyi HUANG1,Yang SHI2,Yutong ZHANG3Mao DENG2Yi GUO2Qingquan KONG2Jianqi QI3Benyuan MA4Qingyuan WANG1,2( )Haomin WANG1 ( )
Institute for Advanced Study, Chengdu University, Chengdu 610106, China
School of Mechanical Engineering, Chengdu University, Chengdu 610106, China
College of Physics, Sichuan University, Chengdu 610064, China
Guangdong Provincial Key Laboratory of Electronic Functional Materials and Devices, Huizhou University, Huizhou 516001, China

† Zhangyi Huang and Yang Shi contributed equally to this work.

Abstract

Achieving full densification of some ceramic materials, such as Y2O3, without sintering aids by spark plasma sintering (SPS) is a great challenge when plastic deformation contributes limitedly to the densification as the yield stress of the material at an elevated temperature is higher than the applied sintering pressure. Herein, we demonstrate that particle fracture and rearrangement is an effective strategy to promote the densification during the pressure-assisted sintering process. Specifically, Y2O3 nanocrystalline powders composed of nanorod and near-spherical particles were synthesized and sintered at various temperatures by the SPS. The results show that the relative density of the ceramics prepared by the nanorod powders is higher than the density of the ceramics from the near-spherical powders after 600 ℃ due to the fracture and rearrangement of the nanorods at low temperatures, which leads to the decrease of particle size and the increase of density and homogeneity. Based on this novel densification mechanism, ultrafine-grained Y2O3 transparent ceramics with good optical and mechanical properties were fabricated successfully from the nanorod powders.

Keywords: spark plasma sintering (SPS), transparent ceramics, nanorods, Y2O3, fracture and rearrangement

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Publication history

Received: 09 May 2022
Revised: 03 September 2022
Accepted: 13 September 2022
Published: 12 November 2022
Issue date: December 2022

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© The Author(s) 2022.

Acknowledgements

This work is supported by the National Natural Science Foundation of China (Nos. 11802042 and 51672100), the Key Research and Development Program of Sichuan Provence (No. 2020YFG0192), and International Cooperation Project of Guangdong Province (No. 2019A050510049).

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