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The dense ZnO-Bi2O3-MnO2-xSiO2 (ZBMS) varistors for x = 0, 1, 2, 3 wt% were fabricated by flash sintering method under the low temperature of 850 ℃ within 2 min. The sample temperature was estimated by a black body radiation model in the flash sintering process. The crystalline phase assemblage, density, microstructure, and electrical characteristics of the flash-sintered ZBMS varistors with different SiO2-doped content were investigated. According to the XRD analysis, many secondary phases were detected due to the SiO2 doping. Meanwhile, the average grain size decrease with increasing SiO2-doped content. The improved nonlinear characteristics were obtained in SiO2-doped samples, which can be attributed to the ion migration and oxygen absorption induced by the doped SiO2. The flash-sintered ZBMS varistor ceramics for x = 2 wt% exhibited excellent comprehensive electrical properties, with the nonlinear coefficient of 24.5, the threshold voltage and leakage current of 385 V·mm-1 and 11.8 µA, respectively.


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Fabrication and electrical characteristics of flash-sintered SiO2-doped ZnO-Bi2O3-MnO2 varistors

Show Author's information Pai PENGa,bYujun DENGa,bJingpeng NIUa,bLiyi SHIcYunzhu MEIa,bSanming DUdJuan LIUa,b( )Dong XUa,b( )
Key Laboratory of Green Fabrication and Surface Technology of Advanced Metal Materials (Anhui University of Technology), Ministry of Education, Ma'anshan 243002, China
Key Laboratory of Etallurgical Emission Reduction & Resources Recycling (Anhui University of Technology), Ministry of Education, Ma'anshan 243002, China
Research Center of Nano Science and Technology, Shanghai University, Shanghai 200444, China
National United Engineering Laboratory for Advanced Bearing Tribology, Henan University of Science and Technology, Luoyang 471023, China

Abstract

The dense ZnO-Bi2O3-MnO2-xSiO2 (ZBMS) varistors for x = 0, 1, 2, 3 wt% were fabricated by flash sintering method under the low temperature of 850 ℃ within 2 min. The sample temperature was estimated by a black body radiation model in the flash sintering process. The crystalline phase assemblage, density, microstructure, and electrical characteristics of the flash-sintered ZBMS varistors with different SiO2-doped content were investigated. According to the XRD analysis, many secondary phases were detected due to the SiO2 doping. Meanwhile, the average grain size decrease with increasing SiO2-doped content. The improved nonlinear characteristics were obtained in SiO2-doped samples, which can be attributed to the ion migration and oxygen absorption induced by the doped SiO2. The flash-sintered ZBMS varistor ceramics for x = 2 wt% exhibited excellent comprehensive electrical properties, with the nonlinear coefficient of 24.5, the threshold voltage and leakage current of 385 V·mm-1 and 11.8 µA, respectively.

Keywords: electrical properties, flash sintering, SiO2 additive, ZBMS varistors

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Publication history
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Publication history

Received: 22 April 2020
Revised: 02 July 2020
Accepted: 04 July 2020
Published: 29 July 2020
Issue date: December 2020

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© The Author(s) 2020

Acknowledgements

This work was financially supported by National Natural Science Foundation of China (Grant Nos. 51802003 and 51572113), State Key Laboratory of New Ceramic and Fine Processing Tsinghua University (No. KF201808), and the Project National United Engineering Laboratory for Advanced Bearing Tribology (No. 201912).

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