纳米氧化铝增强有机硅涂层抗原子氧剥蚀性能

Atomic oxygen erosion resistance of nano-Al_2O_3 reinforced silicone coating

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%。

Nano-Al2O3 reinforced silicone coating was prepared on polyimide substrate by adding silane coupling reagent modified nano-Al2 O3 into silicone resin.Oxygen plasma source generated by thermal cathode filament discharge was used to simulate the atomic oxygen environment.Mass loss,surface morphology and chemical composition of coatings were analyzed before and after atomic oxygen exposure.The results show that atomic oxygen exposure causes serious erosion to polyimide,mass loss increases linearly and carpet-like surface forms with increasing exposure time.The surface modified nano-Al2 O3 particles are uniformly distributed within the silicone coating and the coating exhibits excellent atomic oxygen erosion resistance.After exposure,its mass loss decreases and surface morphology changes little.When the content of nano-Al2 O3 is 2.5%,the mass loss of sample is only 4.7% of polyimide material.