摘要
ZnO压敏电阻的性能,直接决定了避雷器的保护水平和电力系统的绝缘水平。为实现ZnO压敏电阻综合性能的优化,通过溶胶凝胶法将SiO_(2)均匀包覆在ZnO颗粒表面,获得了具备明显核壳结构的粉体颗粒。当Si^(4+)/Zn^(2+)包覆摩尔比为0.075时,在1050℃下所烧结制备的ZnO压敏电阻,电位梯度可达651.37 V/mm,相较于未包覆样品提升115.6%;非线性系数可达73.02,提升104.5%;泄漏电流密度为0.73μA/cm^(2),降低77.5%。基于不同样品晶相测试结果中的区别,结合宏观电学性能、微观晶界势垒特性、介电响应特性等方面的差异,研究了包覆所形成的ZnO@SiO_(2)核壳结构对ZnO压敏电阻性能改善的晶粒生长控制机制、固溶反应机制和氧输运机制。
The performance of ZnO varistor directly determines the protection level of the arrester and the insulation level of power system.In order to optimize the comprehensive performance of ZnO varistor,SiO_(2)was uniformly coated on the surface of ZnO particles by sol-gel method,and powder particles with obvious core-shell structure were obtained.When the Si^(4+)/Zn^(2+)(molar ratio)is 0.075,the ZnO varistor prepared by sintering at 1050℃has a potential gradient of 651.37 V/mm,which increases by 115.6%compared to uncoated samples,the nonlinear coefficient reaches 73.02,which increases by 104.5%,and the leakage current density is 0.73μA/cm^(2),which decreases by 77.5%.Based on the differences in the test results of the crystal phases of different samples,combined with the performance differences in macroscopic electrical properties,microscopic grain boundary barrier properties,and dielectric response properties,the grain growth control mechanism,solid solution reaction mechanism and oxygen transport mechanism of the ZnO@SiO_(2)core-shell structure formed by the coating were investigated for improving the performance of ZnO varistor.
作者
王超凡
何俊佳
张小旋
付志瑶
宋丽
WANG Chaofan;HE Junjia;ZHANG Xiaoxuan;FU Zhiyao;SONG Li(State Key Laboratory of Advanced Electromagnetic Engineering and Technology,Huazhong University of Science and Technology,Wuhan 430074,China;Northwest Branch of State Grid Corporation of China,Xi’an 710048,China;State Key Laboratory of Disaster Prevention&Reduction for Power Grid Transmission and Distribution Equipment,State Grid Hunan Electric Power Company Disaster Prevention&Reduction Center,Changsha 410129,China)
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2023年第1期215-225,共11页
High Voltage Engineering
关键词
氧化锌
压敏电阻
表面包覆
核壳结构
电气性能
晶界势垒
ZnO
varistor
surface coating
core-shell structure
electrical properties
grain boundary barrier
