电极结构对氧化铝陶瓷介电击穿测试的影响分析  

Effects of Electrode Set-Up on Dielectric Breakdown Test of Alumina Ceramics

作　　者：杜继实[1] 雷杨俊[1] 刘伟[1] 唐兵华[1] 张涛[1,2] 程焰林[1] 黄晓军[1] 范玉龙[1] DU Jishi;LEI Yangjun;LIU Wei;TANG Binghua;ZHANG Tao;CHENG Yanlin;HUANG Xiaojun;FANG Yulong(Institute of Electronic Engineering,CAEP,Mianyang 629100,China;College of Materials Science and Engineering,Sichuan University,Chengdu 610065,China)

机构地区：[1]中国工程物理研究院电子工程研究所,四川绵阳621900 [2]四川大学材料科学与工程学院,成都610065

出　　处：《电瓷避雷器》2021年第5期156-163,共8页Insulators and Surge Arresters

基　　金：国家自然科学基金(编号:51972053);中物院超精密加工技术重点实验室基金(编号:ZT17001,ZD18001,ZM18004)。

摘　　要：电极结构对氧化铝陶瓷介电击穿电压的测试有着重要的影响。笔者对5种常用的电极结构作用下的静电场进行了仿真,并对不同电极结构作用导致的氧化铝陶瓷介电击穿位置的形貌进行了显微分析。仿真结果显示:在氧化铝陶瓷-绝缘油-电极的三相点处存在很强的电场集中现象,绝缘油内的最高电场强度远大于氧化铝陶瓷内的最高电场强度,因此在陶瓷击穿之前必然已发生了绝缘油的击穿,从而影响电场分布。介电击穿位置的形貌分析显示,氧化铝陶瓷的介电击穿主要发生在三相点附近,与仿真结果复合。The electrode set-ups have crucial effects on the dielectric breakdown tests of alumina ceramics. Electric field strengths of 5 electrode set-ups commonly used were simulated, and morphologies of the breakdown points for different electrode set-ups were analyzed by a microscope. The simulation results revealed that there was strong electric field concentration at the alumina ceramic-insulating oil-electrode triple junction, and the maximum electric filed strengths in the insulating oil were much higher than the corresponding ones in the alumina ceramics. Therefore, the dielectric breakdown of the insulating oil must have happened prior to the dielectric breakdown of the alumina ceramic, leading to evolution of electric field. It could be found from the morphologies of the breakdown points that the dielectric breakdown of the alumina ceramic happened near-by the triple junction, and it was consistent with the simulation results.

关 键 词：介电击穿 电极结构 电场强度 仿真 

分 类 号：TQ174.758.11[化学工程—陶瓷工业]