材料工程2024，Vol.52Issue(4)：54-60,7.DOI:10.11868/j.issn.1001-4381.2023.000247
Cr2O3对ZnO-Bi2O3基高压压敏陶瓷性能的影响
Effect of Cr2O3 on properties of Zn O-Bi2O3 based high-voltage varistor ceramics
摘要
Abstract
ZnO-Bi2O3-Co2O3-NiO-Mn3O4-SiO2-Cr2O3 varistor ceramics were prepared by solid-phase sintering method.The effects of different doping amounts of Cr2O3 on the microstructure and electrical properties of ZnO varistor ceramics were investigated,and the phases,microstructures and electrical properties of samples were characterized.The results indicate that the addition of Cr2O3 effectively inhibits the abnormal growth of ZnO grains,enhances the uniformity of grain distribution,reduces the ZnO grain resistance and increases the grain boundary resistance.In the range of 0%-0.21%(molar fraction,the same below)of Cr2O3 addition,the nonlinear coefficient of the varistor ceramics increases first and then decreases as the addition amount increases.When the Cr2O3 doping amount is 0.14%,the ZnO varistor ceramics exhibit excellent electrical properties,with a potential gradient E1 mA=216 V·mm-1,leakage current JL= 0.36 μA·cm-2,nonlinear coefficient α=25,residual voltage ratio K=1.815,and aging coefficient Kct= 0.647.In addition,the initial U1 mA value of varistor ceramics still maintains 96.75%after impacted by 100 kA pulse current twice with 4/10 μs waveform.The Cr2O3 doped ZnO varistor ceramics demonstrate excellent impulse stability and significant application potential for lightning arresters of power distribution systems.关键词
ZnO压敏陶瓷/Cr2O3掺杂/微观结构/电气性能/阻抗性能Key words
ZnO varistor ceramic/Cr2O3 doping/microstructure/electrical property/impedance property分类
信息技术与安全科学引用本文复制引用
桂阳海,涂远生,田宽,郭会师,黄海,张心华..Cr2O3对ZnO-Bi2O3基高压压敏陶瓷性能的影响[J].材料工程,2024,52(4):54-60,7.基金项目
国家自然科学基金项目(U1904213,U20041102) （U1904213,U20041102）
河南省2023年科技发展计划(232102230128) （232102230128）
