(1. 中国科学院金属研究所 沈阳材料科学国家（联合）实验室,
沈阳 110016;
2. 北京卫星环境工程研究所, 北京 100029)
摘 要: 在原子氧地面模拟设备中对铜片、 Al2O3涂层试样进行了原子氧暴露实验， 采用XPS、 SEM等分析手段对暴露前后试样表面的物理和化学变化进行了研究。 结果表明: Cu受到原子氧的侵蚀， 质量有少许增加， 表面形貌和电学性能有些变化；Al2O3涂层质量变化很小，对基体提供了良好的保护作用。 XPS分析结果表明Cu表面形成CuO氧化物层。 反应溅射的Al2O3涂层是富Al的， 初始暴露时由于氧化反应而质量有少许增加， 随时间延长， 涂层变得完全符合化学计量。
关键字: 原子氧； 低地轨道； 铜； 防护涂层
（1. Shenyang National Laboratory for Materials Science, Institute of Metal Research,Chinese Academy of Sciences,Shenyang 110016, China;
(2. Beijing Institute of Satellite Environment Engineering, Beijing 100029, China）
Abstract:Low earth orbit (LEO) space missions have been shown that ambient atomic oxygen (AO) environment interacts with spacecraft materials, resulting in surface erosion and significantly affecting the performance of the materials. To ensure durability, the spacecraft operating in the LEO requires protective coatings. The erosion behaviors of copper and Al2O3 coatings were studied when exposed in AO environment of the ground based simulation facility. The chemical and physical changes of sample surfaces after exposed to AO fluxes were investigated with X-ray photoelectron spectroscopy (XPS) and scanning electron microscopy (SEM). The results indicate that copper undergoes slightly degradation, including mass gain and changes of surface morphology and electrical property; Al2O3 coatings have good AO erosion resistance, can provide protection for substrate materials. XPS analysis indicates that the surface of copper exposed to AO fluxes is composed mainly of CuO. Reactive sputtering prepared Al2O3 coatings are substoichiometric with an aluminum sufficiency, its mass increases at the initial stage of AO exposure, this is because of the transformation of substoichiometric to fully stoichiometric due to oxidation.
Key words: atomic oxygen； low earth orbit； copper； protective coating
