电子束辐照对环氧微米复合介质表面陷阱特性和表面电导的影响  

Influence of Electron Beam Irradiation on Surface Trap Properties and Surface Conduction of Epoxy Resin Microcomposites

作　　者：林生军[1,2] 黄印[2] 闵道敏[2] 李枕 谢东日 李盛涛[2] 张翀 邢照亮 

机构地区：[1]平高集团有限公司国家电网高压开关设备绝缘材料实验室,河南平顶山467001 [2]西安交通大学电力设备电气绝缘国家重点实验室,西安710049 [3]国网智能电网研究院,北京102209

出　　处：《绝缘材料》2016年第12期55-61,共7页Insulating Materials

基　　金：国家重点基础研究发展计划(973计划)项目(2015CB251003);中国博士后科学基金(2014M552449);中央高校基本科研业务费专项资金(xjj2014022);西安交通大学"新教师支持计划"(DWSQc130000008)

摘　　要：在真空环境下采用电子束辐照对环氧微米复合介质试样进行表面处理,测试辐照前后试样的表面电位衰减和表面电导等特性。结果表明:辐照前后的试样均存在深、浅两个表面陷阱中心。随着辐照能量的增大,表面浅陷阱密度逐渐减小,其能级未发生明显变化,表面深陷阱的密度和能级均逐渐增大;电子束辐照在介质中沉积的能量与表面陷阱特性的变化有关,当电子束沉积的能量大于电介质禁带宽度的3倍左右,就会造成电介质电离,导致电介质表面深陷阱能级和密度增加,阻碍载流子在试样表面的迁移,降低了试样的表面电导率。采用电子束辐照调控绝缘介质的表面陷阱特性和表面电导,提高沿面闪络电压,能够为电力设备的可靠运行提供保障。The epoxy resin microcomposite samples were treated by electron beam irradiation under vacuum condition. The surface potential decay and surface conduction properties of the untreated and irradiated samples were measured. The results show that both the untreated and irradiated samples have two trap centers, which are labeled as shallow trap and deep trap. With the increase of irradiation energy, the density of surface shallow traps decreases, and the energy of surface shallow traps do not changed obvi- ously, while the density and energy of surface deep traps both increase. The energy deposition in epoxy resin microcomposites during irradiation process is related with the surface trap properties. When the deposited energy is three times larger than the energy gap of dielectrics, the dielectrics can be ionized,leading to the increase of the density and energy of surface deep traps. Moreover, the increase of the energy and density of surface deep traps would hinder the migration of carriers on the surface of sam- pies, making the surface conductivity decrease. The electron beam irradiation could controll the surface trap properties and surface conduction of insulating materials and increase their surface flashover voltage, which can provide guarantee for the reliable operation of power equipment.

关 键 词：电子束辐照 环氧微米复合介质 表面陷阱 表面电导 

分 类 号：TM215[一般工业技术—材料科学与工程]