溶胶-凝胶法提高树脂抗原子氧性能的试验

为提高航天器用树脂基材料的抗原子氧剥蚀性能,将正硅酸乙酯(TEOS,Tetraethyl Orthosilicate)加入环氧树脂溶液中,采用溶胶-凝胶法,制备出SiO₂／环氧杂化材料.在空间环境原子氧效应地面模拟设备中,对材料试样开展了抗原子氧剥蚀性能评估试验,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,并分析了溶胶-凝胶所得杂化材料抗剥蚀性能提高的机理.分析认为:溶胶-凝胶反应过程中在树脂基体内生成的聚硅氧烷和SiO₂,以及原子氧作用下杂化材料表面生成的SiO₂保护层,是杂化材料抗剥蚀性能得以提高的主要原因.

Experimental study on improving AO-resistance of resin using sol-gel method

To improve the atomic oxygen (AO) resistance of the resin in low earth orbit, tetraethyl orthosilicate (TEOS) was added into the epoxy resin(EP) solution. The inorganic phases of SiO₂ was in-situ generated using sol-gel method and the SiO₂/EP hybrid materials were obtained. The ground-based simulation experiments were carried out to evaluate the AO-resistance of the SiO₂/EP hybrid materials. The mass, surface morphology and the surface composition of the samples were compared before and after the AO experiments. The improving mechanism of the AO-resistance was analyzed. There are two essential reasons of the AO-resistance of the hybrid material that the silicones and silica were generated in the resin matrix during sol-gel process and the silica protective coating was formed on the sample surface in AO environment.