纳米氧化铝对硅橡胶空间电荷特性的影响  

Influences of Nano-alumina on the Space Charge Behavior of Silicone Rubber

作　　者：周远翔[1] 郭绍伟[1] 聂琼[1] 刘睿[1] 候非[1] 

机构地区：[1]清华大学电机工程与应用电子技术系电力系统国家重点实验室,北京100084

出　　处：《高电压技术》2010年第7期1605-1611,共7页High Voltage Engineering

基　　金：国家自然科学基金(50877040)~~

摘　　要：为研究硅橡胶的空间电荷特性,开展了纳米氧化铝对硅橡胶空间电荷行为影响的试验研究。通过制备纳米氧化铝(Al2O3)改性液体硅橡胶,利用电声脉冲法(pulse electro-acoustic method,PEA法)测量了纳米氧化铝质量份数对硅橡胶空间电荷特性的影响规律。根据空间电荷消散过程计算了不同纳米氧化铝质量份数硅橡胶的陷阱深度,并分析了空间电荷对硅橡胶性能的影响机理。试验结果表明随着纳米氧化铝质量份数的提高,相同外加场强下,硅橡胶试品的空间电荷积聚量增加,撤压后消散也更为迅速,迁移率随纳米氧化铝质量份数的提高而增大,陷阱深度则随之逐渐减小。分析认为,空间电荷特性随着纳米氧化铝质量份数的增加而呈现变化归因于纳米界面效应导致的陷阱能级分裂,浅陷阱密度增大,从而使得硅橡胶中空间电荷积聚量减少,消散更为迅速。Regarding to space charge characteristics of silicone rubber,we investigated the influence of nano-alumina （Al2O3） on space charge behavior of silicone rubber. Al2O3 modified liquid silicone rubber was prepared in laboratory,and the space charge in silicone rubber （SIR） was measured by pulse electro-acoustic method （PEA）. Based on the measurement of space-charge dispersion process,the trap depth of different nano-alumina content in silicone rubber was calculated. The results show that more space charges accumulate in SIR as the quantity of nano-alumina increasing under the same applied field. On the other hand,the space charges dissipate more quickly in the depolarization process in the case of more Al2O3 shares. The more the Al2O3 mass fraction exists,the more the mobility improves,with trap depth reducing gradually. It is presumed that nano-interface effects split trap energy level and increase shallow trap density. As a result,space charge characteristics of SIR changes with the change of nano-alumina mass fraction.

关 键 词：纳米氧化铝 硅橡胶 电声脉冲(PEA) 空间电荷 迁移率 陷阱深度 

分 类 号：TM85[电气工程—高电压与绝缘技术]