Influence of Electron Beam Irradiation on Surface Trap Properties and Surface Conduction of Epoxy Resin Microcomposites
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 irra-diated 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-ples, 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.
electron beam irradiationepoxy microcompositesurface trapsurface conduction
NETL
NSTL
万方数据
维普
