高电压技术2018，Vol.44Issue(1)：241-247,7.DOI:10.13336/j.1003-6520.hve.20171227030
氧化锌压敏电阻综合性能的多元掺杂综合调控
Comprehensive Performances of ZnO Varistors Tailored by Multi-elements Doping
摘要
Abstract
ZnO varistor is the core element of surge arresters.We investigated the electrical characteristics of rare earth doped ZnO varistor ceramics.Multiple donor dopants (A13+,Ga3+,and Y3+) were employed to improve the comprehensive performances of ZnO varistor ceramics.The leakage current of rare earth doped ZnO varistor ceramics decreased noticeably with Ga2O3 dopants.The Ga3+ dopant occupies the defect sites of grain boundaries and increases the barrier potential of ZnO varistor ceramics,so the leakage current is effectively inhibited.Y2O3 is primarily located around the grains,which restrains ZnO grain growth,increasing the voltage gradient.The Al3+enters the lattices of ZnO grains,decreasing the grain resistance;thus,the residual voltage ratio can be controlled at low levels under a high impulse current.These multiple donor dopants can aid in engineering high-quality ZnO varistors.When being doped with 0.5 mole fraction Ga2O3,0.9 mole fraction Y(NO3)3,and 0.2 mole fraction Al(NO3)3,the sintered varistors showed optimal electrical properties with a nonlinear coefficient of 83,residual voltage ratio of 1.56,leakage current of 1.44 μA/cm2,and voltage gradient of 479 V/mm.This study helps to improve the protection effect of surge arresters,and realizes deeply suppressing the overvoltage of power systems,especially the UHV systems.关键词
氧化锌压敏电阻/电气性能/微观结构/多元掺杂/晶界层Key words
ZnO varistor/electrical performance/microstructure/multi-elements doping/grain boundary引用本文复制引用
孟鹏飞,胡军,邬锦波,何金良..氧化锌压敏电阻综合性能的多元掺杂综合调控[J].高电压技术,2018,44(1):241-247,7.基金项目
国家电网公司科技项目(SGTYHT/15-JS-191) （SGTYHT/15-JS-191）
国家自然科学基金(50737001).Project supported by Science and Technology Project of SGCC(SGTYHT/15-JS-191),National Natural Science Foundation of China(50737001). （50737001）
