Electrical properties and microstructure of zno varistor with high surge protective characteristics
1
조회
0
다운로드
2
인용
0
참고문헌
키워드
초록
We fabricated ZnO-Bi2O3-Sb2O3-Al2O3-CoO-NiO varistor and investigated the effect of sintering temperature on itsmicrostructures and electrical properties. As the sintering temperature increases, crystalline grain growth and phase changeare observed owing to the volatilization of Bi2O3. The varistor voltage decreased from 280 V/mm to 195 V/mm with theincrease in sintering temperature, and the nonlinear coefficient (α) and leakage current of the varistor sintered at 1120 oC were42.3 and 2.8 μA, respectively. For the varistor sintered at 1120 oC, the surface temperature and current increased from 45.3 oCto 87.9 oC and from 2.8 kA to 7.44 kA, respectively, under the surge voltage (waveform of 1.2/50 ms) of 6 kV to 15 kV. According to a repeated surge test (waveform: 1.2/50 ms and 8/20 ms, surge voltage 6.6 kV/3 kA, interval: 60 s), the varistorexhibited excellent surge-withstanding capability with the variation rate of voltage 0.8% and the variation rate of leakagecurrent within 1.5%.
Abstract
We fabricated ZnO-Bi2O3-Sb2O3-Al2O3-CoO-NiO varistor and investigated the effect of sintering temperature on itsmicrostructures and electrical properties. As the sintering temperature increases, crystalline grain growth and phase changeare observed owing to the volatilization of Bi2O3. The varistor voltage decreased from 280 V/mm to 195 V/mm with theincrease in sintering temperature, and the nonlinear coefficient (α) and leakage current of the varistor sintered at 1120 oC were42.3 and 2.8 μA, respectively. For the varistor sintered at 1120 oC, the surface temperature and current increased from 45.3 oCto 87.9 oC and from 2.8 kA to 7.44 kA, respectively, under the surge voltage (waveform of 1.2/50 ms) of 6 kV to 15 kV. According to a repeated surge test (waveform: 1.2/50 ms and 8/20 ms, surge voltage 6.6 kV/3 kA, interval: 60 s), the varistorexhibited excellent surge-withstanding capability with the variation rate of voltage 0.8% and the variation rate of leakagecurrent within 1.5%.
참고문헌 (9)
- M. Peiteado, , Journal of the European Ceramic Society, 27, pp.3867~ (2007)
- H. Zhao, , Materials Letters, 164, pp.80~ (2016)
- 윤중락, "Voltage Enhancement of ZnO Oxide Varistors for Various Y2O3 Doping Compositions", Transactions on Electrical and Electronic Materials, 10(5), pp.152~155 (2009), 한국전기전자재료학회
- 남춘우, "Sintering Effect on Clamping Characteristics and Pulse Aging Behavior of ESD-Sensitive V2O5", Mn3O4, Transactions on Electrical and Electronic Materials, pp.2015, 16(6)[DOI]
- "KS C IEC 61643-11; Low-voltage surge protective devices-Part 11:Surge protective devices connected to low-voltage power systems-Requirements and test methods", ~ (2012)
- 엄주홍, "Parameters Optimization of Impulse Generator Circuit for Generating First Short Stroke Lightning Current Waveform", Journal of Electrical Engineering & Technology, 9(1), pp.286~292 (2014), 대한전기학회
- 김영선, "Failure Prediction of Metal Oxide Varistor Using Nonlinear Surge Look-up Table Based on Experimental Data", Transactions on Electrical and Electronic Materials, 16(6), pp.317~322 (2015), 한국전기전자재료학회[DOI]
- 윤중락, "소결 조건에 따른 ZnO 바리스터의 미세구조 및 전기적 특성", 전기전자재료학회논문지, 19(7), pp.662~666 (2006), 한국전기전자재료학회
- 최만수, "The Preparation of Fe 3 O 4 Thin Film and Its Electrochemical Characterization for Li-Ion Battery", Transactions on Electrical and Electronic Materials, 19(6), pp.417~422 (2018), 한국전기전자재료학회[DOI]