真空下环氧复合材料耐脉冲电流烧蚀性能

在脉冲功率装置中,由于沿面闪络引起绝缘破坏的现象极其常见,因而有必要研制具有高耐烧蚀强度的绝缘材料来延长脉冲功率装置的使用寿命。本文通过向环氧基体中添加微/纳米氢氧化铝,微/纳米氧化铝,以真空闪络一定次数后试样表面形貌和质量损失的变化为烧蚀性能的评价方法,研究了无机填料对环氧耐烧蚀性能的影响。试验结果表明:无机填料对环氧耐烧蚀性能有所提高,氢氧化铝的效果比氧化铝明显;纳米氢氧化铝要好于同质量分数的微米氢氧化铝,而微/纳米氧化铝之间的效果差别刚好相反。

Ablation Resistance of Epoxy Resin Based Composite under Pulse Current in the Vacuum

As insulation material failure may be caused by ablation due to arc discharge during surface flashover in the pulsed power equipment,it is essential to enhance the ablation resistance of the insulation material so as to extend its service life.This paper mainly studies the influence nano/micro alumina and aluminium hydroxide in epoxy composites on the ablation resistance,by quantifying the mass loss and observing the surface topography of sample after several times surface flashover(the peak value is approximately 10kA,and the waveform is 8/20us).The experimental results show that the addition of inorganic filler to epoxy resin is useful for improving the ablation resistance.The performance of aluminium hydroxide filler is much better than alumina.In the case of aluminium hydroxide/epoxy composites,nano-fillers are superior to micro-particles,but in the case alumina/epoxy composite,micro-fillers behave better than nano-particles.