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Evaluation of Low Earth Orbit Environmental Effects on International Space Station Thermal Control Materials

机译:低地球轨道对国际空间站热控材料的环境影响评估

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摘要

Samples of International Space Station (ISS) thermal control coatings were exposed to simulated low Earth orbit (LEO) environmental conditions to determine effects on optical properties. In one test, samples of the white paint coating Z-93P were coated with outgassed products from Tefzel(R) (ethylene tetrafluoroethylene copolymer) power cable insulation as-may occur on ISS. These samples were then exposed, along with an uncontaminated Z-93P witness sample, to vacuum ultraviolet (VUV) radiation to determine solar absorptance degradation. The Z-93P samples coated with Tefzel(R) outgassing products experienced greater increases in solar absorptance than witness samples not coated with Tefzel(R) outgassing products. In another test, samples of second surface silvered Teflon(R) FEP (fluorinated ethylene propylene), SiO. (where x=2)-coated silvered Teflon(R) FEP, and Z-93P witness samples were exposed to the combined environments of atomic oxygen and VLTV radiation to determine optical properties changes due to these simulated ISS environmental effects. This test verified the durability of these materials in the absence of contaminants.
机译:将国际空间站(ISS)热控制涂层的样品暴露在模拟的低地球轨道(LEO)环境条件下,以确定对光学性能的影响。在一项测试中,将白色涂料Z-93P的样品涂上脱气产物,该脱气产物来自ISS上可能发生的Tefzel(乙烯四氟乙烯共聚物)电力电缆绝缘。然后将这些样品与未污染的Z-93P见证样品一起暴露于真空紫外线(VUV)辐射中,以确定日光吸收率的降低。涂有Tefzel(R)脱气产品的Z-93P样品的太阳吸收率比未涂Tefzel(R)脱气产品的见证样品更大。在另一测试中,第二表面的样品镀银了FEP(氟化乙烯丙烯),SiO。 (其中x = 2)涂层的镀银特氟龙(R)FEP和Z-93P见证样品被暴露在原子氧和VLTV辐射的混合环境中,以确定由于这些模拟的ISS环境效应而引起的光学性能变化。该测试验证了这些材料在没有污染物的情况下的耐久性。

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