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Oral presentation

Surface oxidation and tribological properties of a hydrogenated DLC exposed to a simulated low earth orbit space environment

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 510 $^{18}$ atoms/cm $^{2}$ .

Oral presentation

Hyperthermal molecular beam deposition of DLC using laser-induced detonation phenomena

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 $_{4}$ 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 $_{4}$ as a source gas. It was also shown that the DLC film deposited with a CH $_{4}$ beam including relatively high ion component exhibit better tribological properties.