Surface analyses of composites exposed to the space environment on the Long Duration Exposure Facility satellite
Surface analyses of composites exposed to the space environment on the Long Duration Exposure Facility satellite
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DOI：
10.2514/3.25556
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发表时间：
1993-07
影响因子：
1.6
通讯作者：
J. J. Mallon-J.;J. Uht;C. Hemminger
中科院分区：
文献类型：
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作者：
J. J. Mallon-J.;J. Uht;C. Hemminger
我们进行了一系列的表面分析的碳纤维/聚（芳基乙炔）（PAA）基复合材料，暴露在长期暴露设施（LDEF）卫星上的空间环境。这些复合板成对地布置在LDEF卫星的前缘和后缘上。这些复合材料在太空环境中暴露了近六年，没有一个受到灾难性的损坏。前缘的复合材料表现出25 - 125 μ m的表面侵蚀，但后缘面板没有表现出由于暴露而引起的物理外观变化。扫描电子显微镜（SEM）显示，前缘样品上的侵蚀形态主要是平行于纤维的裂隙，三角形横截面深度为10-100 μ m。裂隙的边缘被很好地限定并且穿透基质和纤维。数据表明，碳纤维在裂缝的形成和/或扩大以及复合材料的整体侵蚀速率中起着重要作用。X射线光电子能谱（XPS）和能量色散X射线能谱（EDS）结果表明，污染来自飞行中的有机硅源。
We have conducted a series of surface analyses on carbon fiber/poly(arylacetylene) (PAA) matrix composites that were exposed to the space environment on the Long Duration Exposure Facility (LDEF) satellite. These composite panels were arranged in pairs on both the leading edge and trailing edge of the LDEF satellite. None of the composites were catastrophically damaged by nearly six years of exposure to the space environment. Composites on the leading edge exhibited from 25 to 125 )im of surface erosion, but trailing-edge panels exhibited no physical appearance changes due to exposure. Scanning electron microscopy (SEM) was used to show that the erosion morphology on the leading edge samples was dominated by crevasses parallel to the fibers with triangular cross sections 10-100 jam in depth. The edges of the crevasses were well defined and penetrated through both matrix and fiber. The data suggest that the carbon fibers are playing an important role in crevasse initiation and/or enlargement and in the overall erosion rate of the composite. X-ray photoelectron spectroscopy (XPS) and energy dispersive x-ray spectroscopy (EDS) results showed contamination from in-flight sources of silicone.