TiO2-有机硅热控涂层对空间聚合材料的防护

在原子氧 (AO)地面模拟设备中对空间材料Kapton及TiO2 有机硅热控涂层进行原子氧剥蚀效应试验。用LAMBDA 9分光度计、光电子能谱 (XPS)、红外光谱 (FTIR)和扫描电镜 (SEM )研究了原子氧 (AO)对Kapton侵蚀机理及对其表面涂覆的TiO2 有机硅热控涂层的防护作用进行了表征。AO对Kapton表现了较严重的侵蚀作用 ,而所施用的TiO2 有机硅热控涂层的表面形貌则变化甚少 ,实验表明 ,该涂层对AO辐照有较强的防护效果、较好的空间稳定性和热控性能。

TiO2-Siloxane Thermal Control Coatings for Protection of Spacecraft Polymers

This article describes the properties of TiO_2-siloxane that can be applied to spacecraft polymers to protect from AO environmental influences on the life and performance of space mission. This protective coating is obtained by mixing TiO_2, siloxane and silicate minerals via dispersion and ground. Kaptons with and without TiO_2-siloxane overcoating are exposed to AO impingement from ground-simulation laboratory. Fourier transform infrared spectroscopy (FTIR), LAMBDA-9 spectrophotometer, X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy(SEM) are used to characterize the chemical and physical changes on the surfaces of the unprotected Kapton and protected Kapton samples. The application of protective coatings and their resistance to the space environment are described for ground-based test. From the test results it can be seen that Kapton is heavily eroded, while there is little change on surface of TiO_2-siloxane. So it can be concluded that TiO_2-siloxane coatings are highly resistant to AO and that it is a kind of protective coating for Kapton.