Space environmental effects on MoS2 and diamond-like carbon lubricating films:: Atomic oxygen-induced erosion and its effect on tribological properties

被引:69
作者
Tagawa, M. [1 ]
Yokota, K. [1 ]
Matsumoto, K. [2 ]
Suzuki, M. [2 ]
Teraoka, Y. [3 ]
Kitamura, A. [4 ]
Belin, M. [5 ]
Fontaine, J. [5 ]
Martin, J-M. [5 ]
机构
[1] Kobe Univ, Nada Ku, Kobe, Hyogo 6578501, Japan
[2] Japan Aerosp Explorat Agcy, Chofu, Tokyo 1828522, Japan
[3] Japan Atom Energy Agcy, Sayo, Hyogo 6795148, Japan
[4] Kobe Univ, Kobe, Hyogo 6580022, Japan
[5] Ecole Cent Lyon, F-69134 Ecully, France
基金
日本学术振兴会;
关键词
atomic oxygen; MoS2; DLC; space environmental effect; tribology; low earth orbit;
D O I
10.1016/j.surfcoat.2007.07.069
中图分类号
TB3 [工程材料学];
学科分类号
0805 ; 080502 ;
摘要
Effect of 5 eV atomic oxygen beam exposure on the surface properties of sputter-deposited molybdenum disulfide (MoS2) and diamond-like carbon lubrication films is experimentally evaluated with relevance to space environmental effect in low Earth orbit. X-ray photoelectron spectra indicate that the loss of sulfur and oxidation of molybdenum at the atomic oxygen-exposed MoS2 surface are significant. Depth profiles of sulfur and molybdenum indicate that the oxidation is restricted within 3 nm from the surface. This is due to the fact that Mo oxide plays as a protective layer against further atomic oxygen attack. The surface oxidation affects the friction coefficient, however it is recovered with sliding. Due to the delamination of oxide layer, wear-life of the film is reduced dramatically by certain exposure conditions. On the other hand, no severe oxidation states of carbon atoms are detected at DLC surface from the synchrotron radiation photoemission spectra. In contrast, loss of the DLC film itself is measured by Rutherford backscattering spectroscopy. These analytical results can be explained by the oxidative gasification of carbon atoms at DLC surface. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码:1003 / 1010
页数:8
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