激光源原子氧对Kapton薄膜和Kapton/Al薄膜二次表面镜性能的影响

Laser-induced Atomic Oxygen Impacts on Kapton Films and Second Surface Mirror of Kapton/Al

在模拟空间环境原子氧暴露条件下,采用激光源原子氧对热控涂层材料Kapton薄膜、Kapton/Al薄膜二次表面镜进行了不同剂量的暴露试验。研究了这两种材料的质量损失、表面形貌随原子氧暴露剂量的变化关系,以及Kapton薄膜的光谱透过率、Kapton/Al薄膜二次表面镜的光谱反射率和太阳吸收比Δαs随原子氧暴露剂量的演化规律。结果表明:两种材料的质量损失随原子氧暴露剂量的增加呈线性增大;原子氧暴露后,试样表面呈"地毯"状形貌,且随暴露剂量的增加粗糙度变大;Kapton薄膜的光谱透过率、Kapton/Al薄膜二次表面镜的光谱反射率随原子氧暴露剂量的增加而降低,Kapton/Al薄膜二次表面镜的太阳吸收比Δαs随暴露剂量的增加而增大。最后对Kapton薄膜的存在寿命和Kapton/Al薄膜二次表面镜绝热平面的平衡温度进行了预测。

The influence of the atomic oxygen （AO） exposures in space environment on the thermal control materials of Kapton films and the second surface mirror of Kapton/Al films was experimentally simulated with laser-induced atomic oxygen. The impacts of the AO exposures on various factors, including the mass loss and surface morphologies of these two types of materials, the optical transmittance of Kapton films, and the spectral reflectivity and solar absorptance of kapton/Al films, were evaluated. The simulated results show that the AO exposures strongly affect the microstructures and properties of the two film materials. For instance, as the AO exposure increases, the mass loss increases, the surfaces of the two types of films roughens, the optical transmittance of Kapton and refleetivity of Kapton/Al mirror degrade, but the solar absorptance of kapton/Al films increases. In addition, the life-time of Kapton films and the equilibrimn temperature of the adiabatic plane of the second surface mirror were predicted.