| 摘要: |
| 在空间站工作的太阳电池阵板间电缆上下表面为聚酰亚胺薄膜，在低轨运行时会受到原子氧的强烈侵蚀，需要采取措施对其进行保护。采用射频磁控溅射法在电缆表面制备了颗粒尺寸均匀、排列致密的SiO2膜层。通过表征空间环境试验前后样品发现由于电缆表面的凸起颗粒等缺陷无法完全被SiO2膜层覆盖，导致原子氧会对缺陷位置产生侵蚀作用。采用全氢聚硅氮烷溶液对板间电缆基底进行表面改性处理，制备的聚硅氧氮烷涂层（SiON）可以有效地覆盖电缆基底表面的凸起颗粒等缺陷，使得其上溅射的SiO2膜层表面光滑平整。经原子氧暴露试验，SiON/SiO2层内部没有受到其侵蚀作用，可以防止原子氧对电缆基底的破坏。经多次冷热循环试验，SiON/SiO2复合膜层仍然具备良好的结构特性与结合性能。 |
| 关键词: 聚硅氧氮烷 SiO2 复合膜层 表面改性 板间电缆 |
| DOI：10.11933/j.issn.1007-9289.20180726001 |
| 分类号:TG174.444 |
| 基金项目:上海航天技术研究院材料与工艺研发项目（GYYY2017-18） |
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| Surface Modification and Space Environment Resistant Behavior of SiON/SiO2 Composite Coating on Flat Cable of Solar Array |
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CAO Zhangyi1, WU Min1, MA Jusha1, CHEN Mengjiong1, WANG Xunchun1, ZHANG Zongbo2
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1.State Key Laboratory of Space Power-sources Technology, Shanghai Institute of Space Power-sources, Shanghai 200245, China;2.Laboratory of Advanced Polymer Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190, China
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| Abstract: |
| Polyimide is the primary material for flat cable of solar arrays in space station. It can be easily attacked by atomic oxygen (AO). It is necessary to improve its AO erosion resistance. SiO2 coating was deposited on the flat cable using RF magnetron sputtering. The grain size of SiO2 coatings was uniform with a compact structure. The results of FESEM and EDS indicate that the SiO2 coatings cannot cover protrusion particles so that the atomic oxygen can erode these protrusion particles, resulting in the presence of pinhole defect sites. The surface of the flat cable was modified by immersion in the perhydropolysilazane solution. The silicon oxynitride coatings (SiON) can effectively cover protrusion particles on the flat cable surface. The SiO2 coating was deposited on it followed by thermal annealing in the air. The exposure to atomic oxygen has little effect on the interior of SiON/SiO2 composite coating. The composite coating can prevent the flat cable from destruction by atomic oxygen. After thermal cycling, the SiON/SiO2 composite coating still exhibits excellent physical properties. |
| Key words: SiON SiO2 composite coating surface modification flat cable |
