电子辐照能量对Kapton/Al热控涂层光学性能的影响

 研究了电子辐照时，电子能量与累积通量对Kapton/Al热控涂层光学性能的影响。采用原位测量的手段记录了辐照前后的光谱反射系数。试验结果表明，电子辐照后Kapton/Al热控涂层的反射性能,在太阳光谱辐射强度较大的300~1 200nm波长区间产生较大程度退化。在电子辐照作用下，作为离子导电型聚合物的 Kapton薄膜表面没有发现辐照充电效应。辐照后涂层材料存在“退火效应”，或称“漂白效应”。Kapton/Al涂层太阳吸收比的变化量与电子辐照累积通量的变化关系成幂函数形式,其系数与指数的极大值与极小值分别出现在电子能量为50keV附近。在辐照累积通量相同时，该变化量随辐照电子能量的提高而增大。

Effects of electron irradiation energy on optical properties of Kapton/Al thermal control coatings

The effects of energy and flux of electrons on Kapton/Al thermal control coatings were investigated. The spectral reflectance before and after irradiations of electrons was in-situ measured. Experimental results show that the spectral reflectivity of Kapton/Al coatings was apparently degraded in the 300-1200 nm wavelength range of solar electromagnetic rays after electron irradiation. Under the exposure to electrons, no charging effects were found on the surface of Kapton films as an ion-induced conducting polymer. After electron irradiation, an annealing or bleaching effect occurred on the Kapton/Al coatings. For a given irradiation flux, the increment in solar absorptance of Kapton/Al coatings increased with electron energy. The relation of the increment in solar absorptance of Kapton/Al coatings with the irradiation flux of electrons could be expressed as power function of the electron flux. The coefficient and index of the power function are related to electron energy with maximum and minimum at the electron energy of 50 keV, respectively.