卫星柔性热控薄膜材料充放电效应试验

Experimental on space charging and discharging effect of flexible thermal control films of satellite

针对柔性热控薄膜材料导电/绝缘多层复合、微纳尺寸厚度的结构特点,采用10~70 KeV电子辐照的方法开展了kapton基二次表面镜薄膜材料充放电特性的测试试验,获得了表面充电电位、静电放电频次等关键参数,并采用蒙特卡罗方法研究了辐照电子在多层薄膜材料内的输运规律。研究结果表明由于kapton基二次表面镜薄膜结构的特殊性,当辐照电子能量为10 KeV时未发生静电放电现象,随着电子能量不断增加,薄膜材料的表面充电电位幅值与静电放电频次呈先上升后下降的变化规律,且在电子能量为25 KeV时空间充放电效应最为显著。

In view of the conductive/insulating multilayer composite structure and micro/nano-size thickness of flexible thermal control film materials,a test was conducted on the charging and discharging characteristics of kapton-based secondary surface mirror film materials using 10~70 KeV electron irradiation.The key parameters such as surface charging potential and electrostatic discharge frequency were obtained.The transport law of irradiated electrons in multilayer thin film materials was studied by Monte Carlo method.The results show that there is no electrostatic discharge when the irradiated electron energy is 10 KeV due to the particularity of the kapton-based secondary surface mirror film structure.With the continuous increase of the electron energy,the surface charging potential amplitude of the film material and the electrostatic discharge frequency show a trend of first increasing and then decreasing.The space charging and discharging effect is most significant when the electron energy is 25 KeV.