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This is the first study to conduct the flash sintering of 3 mol% yttria-stabilized zirconia (3YSZ) ceramics at room temperature (25 ℃) under a strong electric field, larger than 1 kV/cm. At the standard atmospheric pressure (101 kPa), the probability of successful sintering is approximately half of that at low atmospheric pressure, lower than 80 kPa. The success of the proposed flash sintering process was determined based on the high electric arc performance at different atmospheric pressures ranging from 20 to 100 kPa. The 3YSZ samples achieved a maximum relative density of 99.5% with a grain size of ~200 nm. The results showed that as the atmospheric pressure decreases, the onset electric field of flash sintering decreases, corresponding to the empirical formula of the flashover voltage. Moreover, flash sintering was found to be triggered by the surface flashover of ceramic samples, and the electric arc on the sample surfaces floated upward before complete flash sintering at overly high pressures, resulting in the failure of flash sintering. This study reveals a new method for the facile preparation of flash-sintered ceramics at room temperature, which will promote the application of flash sintering in the ceramic industry.


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Gas-discharge induced flash sintering of YSZ ceramics at room temperature

Show Author's information Yuchen ZHUaHongyang ZHOUaRongxia HUANGbNianping YANcXilin WANGa( )Guanghua LIUdZhidong JIAa
Engineering Laboratory of Power Equipment Reliability in Complicated Coastal Environments, Tsinghua Shenzhen International Graduate School, Tsinghua University, Shenzhen 518055, China
School of Electromechanical Engineering, Guangdong University of Technology, Guangzhou 510006, China
State Grade Jiangxi Electric Power Research Institute, Nanchang 330000, China
State Key Laboratory of New Ceramics and Fine Processing Tsinghua University, School of Materials Science and Technology, Tsinghua University, Beijing 100084, China

Abstract

This is the first study to conduct the flash sintering of 3 mol% yttria-stabilized zirconia (3YSZ) ceramics at room temperature (25 ℃) under a strong electric field, larger than 1 kV/cm. At the standard atmospheric pressure (101 kPa), the probability of successful sintering is approximately half of that at low atmospheric pressure, lower than 80 kPa. The success of the proposed flash sintering process was determined based on the high electric arc performance at different atmospheric pressures ranging from 20 to 100 kPa. The 3YSZ samples achieved a maximum relative density of 99.5% with a grain size of ~200 nm. The results showed that as the atmospheric pressure decreases, the onset electric field of flash sintering decreases, corresponding to the empirical formula of the flashover voltage. Moreover, flash sintering was found to be triggered by the surface flashover of ceramic samples, and the electric arc on the sample surfaces floated upward before complete flash sintering at overly high pressures, resulting in the failure of flash sintering. This study reveals a new method for the facile preparation of flash-sintered ceramics at room temperature, which will promote the application of flash sintering in the ceramic industry.

Keywords:

flash sintering, yttria-stabilized zirconia (YSZ), room temperature, flashover, AC field, low atmospheric pressure
Received: 22 July 2021 Revised: 22 November 2021 Accepted: 04 December 2021 Published: 06 March 2022 Issue date: April 2022
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Publication history
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Publication history

Received: 22 July 2021
Revised: 22 November 2021
Accepted: 04 December 2021
Published: 06 March 2022
Issue date: April 2022

Copyright

© The Author(s) 2021.

Acknowledgements

This work was supported by the National Natural Science Foundation of China (No. 52077118), the Guangdong Basic and Applied Basic Research Foundation (No. 2021A1515011778), and the State Key Laboratory of New Ceramics and Fine Processing Tsinghua University (No. KFZD201903).

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