空间用聚四氟乙烯材料的原子氧、温度、紫外辐射效应的试验研究

在 IFM原子氧剥蚀效应地面模拟设备中对空间常用材料聚四氟乙烯进行了原子氧剥蚀效应试验,试样温度升高对原子氧效应的影响以及原子氧与紫外辐射复合效应试验,对试验前后试样的质量及表面形貌进行了比较,得出了材料在设备中的反应特点以及温度升高、紫外辐射对材料的原子氧效应的影响规律。对原子氧与材料的反应机理也做了相应的分析。同时还测量比较了原子氧暴露试验前后、原子氧与紫外辐射复合作用前后试样的反射率、透射率等光学性质。

EXPERIMENTAL INVESTIGATIONS OF ATOMIC OXYGEN, TEMPERATURE, ULTRAVIOLET RADIATION EFFECTS ON A SPACECRAFT MATERIAL-POLYTETRAFLUOROETHYLENE

Spacecraft, running in Low Earth Orbit (LEO), will react with environmental conditions, such as atomic oxygen, thermal cycling and ultraviolet radiation, which may severely affect the longevity of spacecraft. Fluorination has lower erosion rate than other materials in space flight exposure tests. So the interactions between this kind of material and environment are of great interest to the aerospace engineering community. Polytetrafluoroethylene (PTFE Teflon) is a commonly used spacecraft material, on which experiment are constructed in this paper to investigate the atomic oxygen erosion effects, the impact of the temperature change on the atomic oxygen effects and the ultraviolet radiation effects with atomic oxygen effects ground based simulation facility. The sample material before and after the experiments is compared in mass and surface morphology. The reaction characteristics of the material in the facility and the impact of temperature change and ultraviolet radiation on atomic oxygen effects were acquired. Through analyzing the reaction mechanism between atomic oxygen and PTFE Teflon, it was concluded that the collision of energetic particles may be an important factor of PTFE Teflon mass loss. Optic properties, such as reflectivity and transmissivity, before and after experiments were measured and compared.