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マイクロサテライトにおけるトライボロジー技術と宇宙環境からの影響評価に関する研究

空间环境对微小卫星的摩擦学技术及影响评估研究

基本信息

批准号：
10555335
负责人：
TAGAWA Masahito
金额：
$ 4.16万
依托单位：
KOBE UNIVERSITY (1999-2000)Osaka University (1998)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B).
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 2000
项目状态：
已结题

项目摘要

This project deals with the effect on space environment of tribological properties of molybdenum disulfide(MoS2)lubricants. In the previous researches, tribological testing was always carried out in a post process, which means the start-up friction includes the force of forming a wear track. This phenomenon usually covers the effect of atomic oxygen in a friction force. In this research, in-situ tribological testing was conducted and effect of atomic oxygen was investigated by XPS, AES, RGA, AFM and friction test. The results clearly indicated that the friction force increases with atomic oxygen fluence and it reached more than 2.5 times larger than ordinary friction force. Not only the start-up friction, but also steady-state friction increased with atomic oxygen exposures. The atomic oxygen fluence dependence on a friction coefficient was clearly observed. XPS results were interpreted that sulfur atom was removed from the MoS_2 surface, and molybdenum was oxidized into MoO_3 by the atomic oxygen exposures. RGA measurements revealed that the volatile reactive products of atomic oxygen/MoS_2 system is So. From the results obtained in this study, we concluded that MoS_2 lubricant is severely influenced by the atomic oxygen exposures in low earth orbit. In the case of microsatellite system, which is a recent technological trends in satellite systems, applied load of a friction system will be reduced due to the reduced mass, i.e., low inertia, thus, the delaminating phenomenon at the frictional surface will not be expected very much in such a system. Conclusion is that the microsatellite will be influenced by the atomic oxygen more severely.

本项目研究二硫化钼（MoS 2）润滑剂的摩擦学性能对空间环境的影响。在以往的研究中，摩擦学测试通常是在后期进行的，这意味着启动摩擦力包括形成磨痕的力。这种现象通常包括原子氧在摩擦力中的作用。本文采用XPS、AES、RGA、AFM和摩擦磨损试验等方法对原子氧的作用进行了研究。结果表明，摩擦力随原子氧注量的增加而增大，达到普通摩擦力的2.5倍以上。不仅启动摩擦，但也稳态摩擦原子氧暴露增加。清楚地观察到原子氧注量对摩擦系数的依赖性。XPS分析结果表明，MoS_2表面的硫原子被去除，钼被氧化成MoO_3。RGA测量表明，原子氧/MoS_2体系的挥发性反应产物为SO。从研究结果可以看出，MoS_2润滑剂在近地轨道上受到原子氧辐照的严重影响。在微小卫星系统的情况下，这是卫星系统中的最新技术趋势，摩擦系统的施加载荷将由于质量减小而减小，即，低惯性，因此，在这种系统中，摩擦表面处的脱层现象将不太被期望。结果表明，原子氧对微卫星的影响更大。