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Metals 2015, 5(4), 1957-1970; doi:10.3390/met5041957

Resistance of Hydrogenated Titanium-Doped Diamond-Like Carbon Film to Hyperthermal Atomic Oxygen

1
Laboratory of Advanced Science and Technology for Industry, University of Hyogo, 3-1-2 Koto Kamigori 678-1205, Japan
2
Faculty of Engineering, Kobe University, Nada Kobe 657-8501, Japan
3
Faculty of Maritime Sciences, Kobe University, Higashi-Nada Kobe 658-0022, Japan
4
Department of Materials Science and Technology, Nagaoka University of Technology, Kamitomioka Nagaoka 940-2188, Japan
*
Author to whom correspondence should be addressed.
Academic Editor: Klaus-Dieter Liss
Received: 2 September 2015 / Revised: 2 September 2015 / Accepted: 14 October 2015 / Published: 23 October 2015
(This article belongs to the Special Issue Metals Challenged by Neutron and Synchrotron Radiation)
View Full-Text   |   Download PDF [761 KB, uploaded 23 October 2015]   |  

Abstract

The effect of irradiation by a hyperthermal-atomic-oxygen beam on hydrogenated titanium-doped diamond-like carbon (hydrogenated Ti-DLC) films, applied as a solid lubricant for equipment used in low-earth orbit was investigated. Unlike the film thickness of hydrogenated non-doped DLC films, that of hydrogenated Ti-DLC films was found to be constant after the films were exposed to atomic oxygen. In addition, bulk composition of the hydrogenated Ti-DLC film stayed constant, and in particular, hydrogen content in the film did not decrease. These results indicate that a hydrogenated Ti-DLC film can keep its low friction properties under vacuum. Surface chemical analysis showed that a titanium-oxide layer is form on the film by exposure to atomic oxygen. The thickness of the titanium oxide layer was estimated to be about 5 nm from the element distribution in the depth direction of the hydrogenated Ti-DLC films. The titanium-oxide layer was interpreted to protect the bulk film from erosion by hyperthermal atomic oxygen. View Full-Text
Keywords: titanium-doped diamond-like carbon film; solid lubricant; hyperthermal atomic-oxygen beam; Rutherford backscattering spectrometry; elastic-recoil detection analysis; X-ray photoelectron spectroscopy; near-edge X-ray-absorption fine structure; glow-discharge optical-emission spectroscopy titanium-doped diamond-like carbon film; solid lubricant; hyperthermal atomic-oxygen beam; Rutherford backscattering spectrometry; elastic-recoil detection analysis; X-ray photoelectron spectroscopy; near-edge X-ray-absorption fine structure; glow-discharge optical-emission spectroscopy
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Kidena, K.; Endo, M.; Takamatsu, H.; Niibe, M.; Tagawa, M.; Yokota, K.; Furuyama, Y.; Komatsu, K.; Saitoh, H.; Kanda, K. Resistance of Hydrogenated Titanium-Doped Diamond-Like Carbon Film to Hyperthermal Atomic Oxygen. Metals 2015, 5, 1957-1970.

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