空间原子氧对低地球轨道航天器用粘结剂的腐蚀效应影响

原子氧是低地球轨道(leo)-种重要的空间环境因素,地面模拟试验是用于开展leo航天器备选材料原子氧环境评价的主要手段.利用北京卫星环境研究所的原子氧设备,对牌号为e-32的环氧树脂和牌号为gs414的硅橡胶两种粘结剂进行了评价试验.依据轨道参数与航天器两年的设计寿命,选定试验中原子氧的等效积分通量为1.4×1021atom/cm2.试验结果表明,环氧树脂样品出现了较大的质量损失,而硅橡胶样品的质量损失则相对较小.根据质量损失计算环氧树脂样品的原子氧反应率处于3.2×10-24～3.8×10-24cm3/atom之间.试验后的环氧树脂样品表面颜色变浅,硅橡胶样品的表面则呈现了玻璃化.对两种材料都进行了表面形貌分析,试验前后测试结果的对比分析表明原子氧的氧化作用使材料表面发生了较大的变化. abstract： atomic oxygen (ao) is prevalent in low earth orbit (leo). ground-based testing on ao exposure was performed to investigate the effects of atomic oxygen on materials to be used in leo spacecraft. two types of adhesive materials, e-32 epoxy and gs414 silicone, were tested in the atomic oxygen testing facility at beijing institute of spacecraft environment engineering (bisee). the equivalent atomic oxygen fluence in test was approximately 1.4×1021 atom/cm2 as determined based on two years' exposure on leo. significant mass losses of the epoxy adhesive samples were observed after the exposure to atomic oxygen, but relatively small mass changes were found in the silicone samples. the erosion yields of epoxy samples range from 3.2×10-24 cm3/atom to 3.8×10-24 cm3/atom. bleaching by atomic oxygen was found in the epoxy samples. the surface on the silicone sample was glossed after ao exposure. the external appearance of both kinds of materials was analyzed using scanning electron microscope (sem) and x-ray photoelectron spectroscopy (xps). a comparison between unexposed and exposed samples shows noticeable changes on the s

The effects of space atomic oxygen erosion on epoxy and silicone adhesives in LEO spacecraft

Atomic oxygen (AO) is prevalent in Low Earth Orbit (LEO). Ground-based testing on AO exposure was performed to investigate the effects of atomic oxygen on materials to be used in LEO spacecraft. Two types of adhesive materials, E-32 epoxy and GS414 silicone, were tested in the atomic oxygen testing facility at Beijing Institute of Spacecraft Environment Engineering (BISEE). The equivalent atomic oxygen fluence in test was approximately 1.4×1021 atom/cm2 as determined based on two years' exposure on LEO. Significant mass losses of the epoxy adhesive samples were observed after the exposure to atomic oxygen, but relatively small mass changes were found in the silicone samples. The erosion yields of epoxy samples range from 3.2×10-24 cm3/atom to 3.8×10-24 cm3/atom. Bleaching by atomic oxygen was found in the epoxy samples. The surface on the silicone sample was glossed after AO exposure. The external appearance of both kinds of materials was analyzed using Scanning Electron Microscope (SEM) and X-ray Photoelectron Spectroscopy (XPS). A comparison between unexposed and exposed samples shows noticeable changes on the surface of materials.