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为了提高航天器用有机硅涂层的抗原子氧侵蚀性能,用氨丙基倍半硅氧烷交联固化环氧有机硅树脂,在聚酰亚胺基材上制备出杂化涂层,并对杂化涂层进行了地面原子氧暴露试验,分析了试验前后杂化涂层表面形貌、化学成分和化学结构的变化。结果表明,氨丙基倍半硅氧烷阻止了有机硅涂层中微裂纹的产生,避免了“淘蚀”现象,材料质量损失明显下降。在原子氧暴露过程中,APOSS分子中的O和Si从低的结合能态慢慢向高的结合能态(氧化态)转变,在表面生成了SiO_2保护层,阻止了原子氧对底层材料的进一步侵蚀。
In order to improve the anti-Oxygen erosion resistance of the silicone coating used in spacecraft, the epoxy silicone resin was cross-linked with aminopropylsilsesquioxane to prepare a hybrid coating on the polyimide substrate, The hybrid coatings were tested for ground atomic oxygen exposure. The surface morphology, chemical composition and chemical structure of hybrid coatings were analyzed before and after the experiments. The results show that aminopropylsilsesquioxane prevents the generation of micro-cracks in the silicone coating, avoids the phenomenon of “erosion” and the mass loss of the material is obviously decreased. During the atomic oxygen exposure, O and Si in the APOSS molecules gradually shift from low bonding energy states to high bonding energy states (oxidation states), forming a protective layer of SiO 2 on the surface, preventing the atomic oxygen from affecting the underlying material Further erosion.