为提高绝缘材料的耐沿面闪络能力,对聚四氟乙烯在指形电极下的沿面绝缘特性及沿面闪络前后材料表面的物化特性进行研究.测量了不同放电距离下的沿面闪络电压,并采用原子力显微镜和X射线光电子能谱仪分析闪络前后聚四氟乙烯表面形貌、表面粗糙度、表面化学成分的变化.结果表明:随着电极间距的增大,沿面闪络电压升高,闪络场强降低;随着闪络时间的增长,材料表面的凸起变大、变平,表面粗糙度增大,表面发生显著的物理变化;在沿面闪络过程中,材料表面化学基团发生变化,表面水接触角下降.
In order to improve the resistance to surface flashover of insulating materials, the surface insu-lating properties, physical and chemical properties of the polytetrafluoroethylene (PTFE) surface before and after surface flashover were studied under finger shaped electrodes. The surface flashover voltage under different discharge distances was measured, and the changes of surface morphology, surface rough-ness, and surface chemical composition of the PTFE before and after flashover were analyzed by atomic force microscopy and X-ray photoelectron spectroscopy. The results show that with the increase of the electrode distance, the surface flashover voltage increases, while the flashover field strength decreases. With the increase of the flashover time, the bulges on the material surface become large and smooth, and the surface roughness increases significantly. Moreover, in the flashover process, chemical groups have changed on the PTFE surface, and the water contact angle of the material surface reduces.
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