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Tagawa, Masahito*; Asada, Hidetoshi*; Yokota, Kumiko*; Ohara, Hisanori*; Nakahigashi, Takahiro*; Teraoka, Yuden; Martin, J. M.*; Belin, M.*
no journal, ,
Effect of space environment on a hydrogenated diamond-like carbon (DLC), which is a candidate of next generation space-approved solid lubricant, has been studied. No significant changes in friction coefficient and surface oxidation states were detected with energetic atomic oxygen fluence of 5
10
atoms/cm
.
Tagawa, Masahito*; Asada, Hidetoshi*; Matsuura, Yoshimitsu*; Yokota, Kumiko*; Teraoka, Yuden; Kitamura, Akira*; Fontaine, J.*; Belin, M.*
no journal, ,
New room-temperature deposition technology of a hydrogenated diamond-like carbon (DLC) film was developed with hyperthermal hydrocarbon beams. Four CH
molecular beams with different beam energy and ion composition were prepared and deposited DLC films were evaluated by various surface analytical methods including Raman spectroscopy, RBS and SR-PES. It was found that hydrogenated (20-30%) DLC films can be deposited with use of CH as a source gas. It was also shown that the DLC film deposited with a CH beam including relatively high ion component exhibit better tribological properties.
Yokota, Kumiko*; Asada, Hidetoshi*; Tagawa, Masahito*; Ohara, Hisanori*; Nakahigashi, Takahiro*; Yoshigoe, Akitaka; Teraoka, Yuden; Martin, J. M.*; Belin, M.*
no journal, ,
Hydrogenated diamond-like carbon (DLC) is expected as a lubricant for space uses because of its ultra low friction charactor in vacuum. Thus, DLC films were exposed to atomic oxygens which were generated by a laser detonation method simulating a low orbit space environment. The DLC surfaces were analysed and the results are reported in this talk. The hydrogenated amorphous DLC was fabricated by a RF-CVD method on Si substrates. Relative collision energy of space planes against atomic oxygens can be simulated with the space environment experimental apparatus. The DLC films exposed to atomic oxygens were analysed by an SR-PES method etc. The SR-PES was performed at the surface chemical reaction analysis station installed in the BL23SU of SPring-8. It was suggested that some volatile oxides were formed and desorbed from the DLC surface when DLC surface was irradiated by atomic oxygens with an incident energy of 4.2 eV and fluence of 510atoms/cm.