Changes in the structure and tribological property of Ag film by LEO space environment exposure
Changes in the structure and tribological property of Ag film by LEO space environment exposure
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DOI：
10.1016/j.apsusc.2014.08.197
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发表时间：
2014-11-30
影响因子：
6.7
通讯作者：
Liu, Weimin
中科院分区：
文献类型：
--
作者：
Gao, Xiaoming;Hu, Ming;Liu, Weimin
利用搭载在中国神舟七号载人飞船上的空间环境曝光仪(SEED)，对弧离子镀银薄膜进行了43.5h的近地轨道(LEO)曝光。用X射线衍射仪、场发射扫描电子显微镜、X射线光电子能谱和球盘式摩擦磨损试验机研究了银膜在空间环境暴露后的结构、形貌、成分和摩擦学性能。X射线光电子能谱(XPS)和X射线衍射谱(XRD)分析表明，SEE处理后，银膜表面部分氧化成Ag2O，FESEM观察到银膜表面出现开裂和剥落现象，使银膜失去了金属光泽，变得灰白色。结果表明，材料的摩擦学性能变差，获得了高/不稳定的摩擦力。(C)2014爱思唯尔B.V.保留所有权利。
Ag films, deposited by arc ion plating, had been exposed for 43.5h in real low earth orbit (LEO) space environment by a space environment exposure device (SEED) aboard the China Shenzhou-7 manned spaceship. The structure, morphology, composition and tribological property of the Ag films after the space environment exposure (SEE) were investigated using X-ray diffraction (XRD), field emission scanning electron microscope (FESEM), X-ray photoelectron spectroscope (XPS) and ball-on-disk tribometer, respectively. Depth XPS and XRD analysis revealed that after the SEE, the surface layer of Ag films was partially oxidized to Ag2O, the cracking and flaking phenomena could be observed from the film surface by FESEM, and so the Ag films lose its metallic shine and became gray. As a result, the tribological performance was deteriorated and the high/unstable friction was obtained. (C) 2014 Elsevier B.V. All rights reserved.