电子通量对ZnO/K2SiO3热控涂层光学性能的影响
Electron flux effects on the optical properties of ZnO/K2SiO3 thermal control coating
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摘要: 研究了电子通量对ZnO/K2SiO3热控涂层光学性能的影响。分别采用通量为5×1011/cm2·s，8×1011/cm2·s，1×1012/cm2·s 和5×1012/cm2·s的电子对试样进行辐照。电子辐照下涂层的光学性能发生了退化，并且发现了退化涂层在空气中的“漂白”现象。分析了ZnO/K2SiO3热控涂层光学性能的退化机制，同时讨论了电子通量对太阳光谱吸收系数的影响。实验结果发现，在5×1011～1×1012/cm2·s的电子通量范围内，电子通量对ZnO/K2SiO3热控涂层光学性能的影响相同。因此在这个电子通量范围内，采用加速地面试验来模拟空间的电子辐照效应是有效的。Abstract: The effects of electron flux on the optical properties of ZnO/K2SiO3 thermal control coating are studied. Th e test specimens were exposed to electrons at a flux of 5×1011/cm2·s，8×1011/cm2·s，1×1012/cm2·s and 5×1012/cm2·s, respectively . The irradiation caused an optical degradation of the coatings. And an air bleaching phenomenon of the degraded coatings was observed. Mechanisms for optical degradation of ZnO/K2SiO3 thermal control coating are analyzed. The influence of electron flux on solar absorptance is also discussed. It is found that in the electron flux range of 5×1011 to 1×1012/cm2·s, there are no different electron flux effects on the optical properties of ZnO/K2SiO3 thermal control coating. Accordingly, in this range the accelerated ground-based testing to simulate e
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Key words:
- electron exposure /
- thermal control coating /
- optical properties /
- space environment
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