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低地球轨道环境中的原子氧会剥蚀航天器表面材料,影响其性能和寿命,因此在使用时需要选用合适的手段来进行原子氧防护.采用溶胶-凝胶法,利用正硅酸乙酯在树脂体系中的水解-缩合反应,在基体中原位生成无机相而获得杂化聚酰亚胺.在原子氧效应地面模拟设备中,对杂化聚酰亚胺试样开展了性能评估试验,总结了试验前后试样的质量、表面形貌和表面成分的变化特点,并分析了材料耐剥蚀性能与正硅酸乙酯添加量的关系、杂化材料的耐剥蚀机理.结果表明,杂化聚酰亚胺的耐原子氧性能优于原树脂,其原子氧试验质量损失仅为原树脂的31.6%~14.8%.分析认为,溶胶-凝胶过程中在树脂基体中生成的有机含硅结构和无机SiO2,以及原子氧作用下杂化材料表面生成的SiO2保护层,是杂化材料耐原子氧剥蚀性能提高的原因.
The atomic oxygen in low Earth orbit environment will degrade the surface material of the spacecraft and affect the performance and life span of the spacecraft, therefore, it is necessary to select proper means for the atomic oxygen protection when using it.Using sol-gel method, Resin system hydrolysis-condensation reaction, in situ generated inorganic matrix in the matrix to obtain a hybrid polyimide In atomic oxygen effect in the ground simulation equipment, hybrid polyimide samples performance evaluation test carried out summary The changes of the quality, surface morphology and surface composition of the samples before and after the test were analyzed. The relationship between the anti-erosion properties of the samples and the amount of TEOS added and the anti-erosion mechanism of the hybrid materials were analyzed.The results showed that the hybrid poly The resistance to atomic oxygen of the imide is better than that of the original resin, and the mass loss of the atomic oxygen test is only 31.6% ~ 14.8% of that of the original resin.It is considered that the organic silicon-containing structure formed in the resin matrix in the sol-gel process and Inorganic SiO2, as well as the SiO2 protective layer formed on the surface of the hybrid material under the action of atomic oxygen, is the reason for the improvement of the resistance to atomic oxygen oxidation of the hybrid material.