| 摘要: |
| 航天器表面介质材料易遭受表面充放电危害。利用30keV单能电子对几种不同的航天介质材料进行了表面充放电模拟试验，测量了不同电子通量辐照下的表面充电电位以及放电脉冲。试验结果表明，聚酰亚胺薄膜在接地处理不当时表面可充至千伏以上，易发生表面放电，且辐照强度越大，放电频率越高。表面镀铝的聚酰亚胺薄膜在不接地时，铝膜成为悬浮导体更加剧了放电的危害。而通过渗碳处理的聚酰亚胺薄膜，其良好的导电性能可有效抵御nA/cm2量级电子的表面充电。聚四氟乙烯天线罩表面未进行防静电处理时，表面充电电位可达万伏量级，极易发生放电。 |
| 关键词: 介质 表面充电 放电脉冲 电子通量 |
| DOI： |
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| 基金项目:国家自然科学基金（11875060） |
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| Experimental Research on Surface Charging and Discharging of Space-Used Dielectrics |
| ZHENG Hansheng,CAI Minghui,LIU Xiaoxu,ZHANG Zhenlong,HAN Jianwei,ZUO Yi |
| (Sichuan Institute of Aerospace Systems Engineering;National Space Science Center, Chinese Academy of Sciences;Beijing Institute of Astronautical Systems Engineering) |
| Abstract: |
| Dielectrics used outside spacecraft may suffer surface charging effect. Several materials are irradiated by 30keV electrons and the surface charging potential and discharging pulse are measured. Experimental results show that PI film can be charged to several kV thus easily results in surface discharging if it is not properly grounded. Higher electron flux leads to more frequent discharging. When the surface of aluminized PI film is not grounded, the isolated metal can dramatically aggravate the hazard of surface discharging. Carburized PI film can effectively defense surface charging of electron flux up to nA/cm2 due to its excellent conductivity. PTFE antenna housing, when not dealt with anti-static, can be charged up to 10kV and have a rather high risk of discharging. |
| Key words: Dielectrics Surface charging ESD pulse Electron flux |