环氧树脂电气绝缘性能优良,但是其在脉冲功率设备中充当绝缘子时,表面容易带电且不易衰减,当表面电荷集聚到一定的程度会造成局部放电甚至发展为沿面闪络。为了提高环氧树脂的沿面闪络性能,用中心粒径为1 μm的氢氧化铝(ATH)无机填料来改善环氧树脂复合材料的表面性能。分别制备了ATH填料质量分数为0%(纯环氧) ,20%,40%,60%,80%和100%的ATH/环氧树脂复合材料试样。用电声脉冲法研究了ATH填料对环氧树脂复合材料电荷衰减性能的影响,对比了试样直流极化场强为10 kV/mm和30 kV/mm的试验结果。结果表明: ATH/环氧树脂复合材料电荷的衰减常数不仅与填料的质量分数有关,而且与试样的带电量有关。

Though the electrical insulation properties of epoxy resin are very excellent,the surface of epoxy insulator is charged easily and the charge is hard to decay. When the charge density accumulates to a level, it would lead to a part discharge or a surface flashover. In order to improve the surface flashover voltage of epoxy resin, ATH inorganic fillers with 1μm particle size are used to change the surface properties of the epoxy resin. Samples with different mass fraction ATH fillers are prepared, which are 0% (pure epoxy), 20%, 40%, 60%, 80% and 100%. The pulsed electro-acoustic method is employed to study charge decay properties of epoxy composites. Several kinds of composites are experimented after the application of 10 kV/mm or 30 kV/mm polarization electrical field respectively. The results show that the charge decay constant of epoxy composites is related to the inorganic fillers mass fraction of the epoxy resin and the charge quantities of the samples.