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采用硅烷偶联剂对纳米Al2O3进行表面处理并在聚酰亚胺(Polyimide)基材表面制备出纳米氧化铝增强有机硅涂层。用热阴极灯丝放电产生的氧等离子体来模拟原子氧环境,研究了有机硅涂层的质量损失、表面形貌及化学成分的变化。结果表明,原子氧对聚酰亚胺基材剥蚀严重,质量损失线性增加,表面形成地毯状。经表面处理的纳米Al2O3微粒可以均匀分布在有机硅涂层中,具有良好的抗原子氧剥蚀性能。原子氧暴露后,其质量损失和微观表面形貌变化较小,当纳米Al2O3含量为2.5%时,试样的质量损失仅为聚酰亚胺的4.7%。
The nano-Al2O3 was surface-treated with silane coupling agent and the nano-alumina reinforced silicone coating was prepared on the surface of polyimide substrate. The oxygen plasma generated by hot cathode filament discharge was used to simulate the atomic oxygen environment. The mass loss, surface morphology and chemical composition of the organic silicon coatings were studied. The results show that atomic oxygen has a serious erosion on the polyimide substrate, the mass loss increases linearly, and the surface forms a carpet. Surface-treated nano-Al2O3 particles can be evenly distributed in the silicone coating, with good anti-oxygen atomic erosion. After the atomic oxygen exposure, the mass loss and microscopic surface morphology change is small, when the nano-Al2O3 content is 2.5%, the mass loss of the sample is only 4.7% of the polyimide.