电磁轨道发射装置内膛绝缘性能研究

 脉冲大电流放电过程中的高温烧蚀将降低绝缘支撑的绝缘性能，影响系统的寿命和效率。为研究烧蚀对环氧树脂绝缘性能的破坏作用，开展了模拟实验，利用氩弧焊对环氧树脂样品进行高温烧蚀处理，通过改变烧蚀电流、时间、距离和面积，获得不同烧蚀情况的样品。从表面电阻率和沿面闪络电压两方面对样品的绝缘性能进行了评估。结果表明，环氧树脂在高温烧蚀后绝缘性能大幅度降低。通过扫描电子显微镜和能谱分析，样品表面粗糙度增大，成分中氧化物的含量上升，导致了绝缘性能降低。

Investigation on insulation support performance in electromagnetic launcher

The high temperature ablation in the process of pulsed high current discharge would reduce the insulation performance of the insulation support and affect the life and efficiency of the system. To investigate the destructive effect of ablation on epoxy resin insulation, we use argon arc welding to modify the surface epoxy resin with different values of ablation current, time, distance and area so as to obtain samples with different ablation situations. The surface resistivity and surface flashover voltage of the samples are then measured. The results show that the insulation property of the epoxy resin after high temperature ablation degrades greatly. Scanning electron microscopy and energy spectrum analysis indicate that the increasing surface roughness and oxide would reduce the insulation property of epoxy resin.