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

Peng, Pai; Deng, Yujun; Niu, Jingpeng; Shi, Liyi; Mei, Yunzhu; Du, Shigui; Liu, Juan; Xu, Dong

doi:10.1007/s40145-020-0404-7

Cited by 62 publications

(19 citation statements)

References 41 publications

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“…The decrease of grain size is attributed to the doping with SLS glass which contains high SiO 2 , which Zn 2 SiO 4 phase acted as a nail at the grain boundary. Thus, hindering grain movement and inhibiting grain growth [32]. The Co element diffuses from grain boundary to grain simultaneously as shown in Fig.…”

Section: J-e Measurementsmentioning

confidence: 99%

Effect of sintering time on microstructure and electrical properties of varistor ceramics ZnO-CoO-SLS glass

2021

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The influence of sintering time on the microstructure and electrical properties of ZnO-CoO-SLS (soda lime silica) glass varistor based ceramics has been investigated. With increased sintering time, the density of the sintered pellets increased from 5.060 to 5.644 g/cm3 resulting in an increase of the nonlinear coefficient and barrier height of the ZnO-CoO-SLS glass varistor ceramics from 6.742 to 8.252 and 0.846 to 0.955 eV, respectively. The breakdown voltage is inversely proportional to the leakage current. The breakdown voltage increases from 183.7 to 278.6 V/cm and the leakage current decreases from 5.832 to 4.324 ?A/cm2 as the sintering time is increased from 60 to 150 minutes but as the increase sintering time of 150 minutes their value decreases to 222.8 V/cm and increases to 5.078 ?A/cm2. The high nonlinearity of 7.366 with lowest leakage current of 4.324 ?A/cm2 has been achieved from the varistor sintered at 150 minutes, breakdown voltage of 278.6 V/cm and barrier height of 0.954 eV.

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Section: J-e Measurementsmentioning

confidence: 99%

Effect of sintering time on microstructure and electrical properties of varistor ceramics ZnO-CoO-SLS glass

2021

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“…In this process, ceramics can be densified more rapidly (usually in < 5 min) at furnace temperatures several hundred degrees lower than that utilized during traditional sintering. Various materials such as ionic conductors, semiconductors, and insulators have been successfully prepared by flash sintering or other FASTs 2 J Adv Ceram 2022, 11(3): 0-0 www.springer.com/journal/40145 [2][3][4][5][6][7][8][9].…”

Section: Introduction mentioning

confidence: 99%

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

et al. 2022

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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 °C) 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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“…With the development of current-or electric field-assisted sintering techniques, such as spark plasma sintering (SPS) and micro-wave sintering (MWS), it becomes possible to obtain ceramic materials at a faster speed and lower energy consumption [1][2][3]. Since being first reported by Raj et al [4] in 2010, flash sintering (FS) has been broadly applied to sinter many kinds of ceramics, including YSZ [5][6][7], Al 2 O 3 [8,9], BaTiO 3 [10,11], SiC [12], and ZnO [13,14]. According to these studies, FS makes it possible to sinter highly densified ceramics in a short time at low temperatures.…”

Section: Introductionmentioning

confidence: 99%

Ethanol-Induced Flash Sintering of ZnO Ceramics at Room Temperature

Yan¹,

Pan²,

Deng³

et al. 2022

Materials

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Ceramic flash sintering with a strong electric field at room temperature is the most attractive method. This paper presents the flash sintering of ZnO ceramics at room temperature by the application of a 3-kV/cm electric field after a dropwise addition of ethanol. This method is simple and easy to control. The density of the specimen exceeded 96% after 30 s of sintering. No significant difference was observed in the initiation voltage of flash sintering with and without the dropwise addition of ethanol. Ethanol burns upon dropwise addition, causing a discharge to first occur far from the location of the dropwise addition, followed by glowing and heating up, which causes the temperature of the entire specimen to rise.

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

Cited by 62 publications

References 41 publications

Effect of sintering time on microstructure and electrical properties of varistor ceramics ZnO-CoO-SLS glass

Effect of sintering time on microstructure and electrical properties of varistor ceramics ZnO-CoO-SLS glass

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

Ethanol-Induced Flash Sintering of ZnO Ceramics at Room Temperature

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