A. Yamaguchi

Kyushu University, Hukuoka, Fukuoka, Japan

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Publications (2)0.92 Total impact

  • K Nakashima · A Yamaguchi · Y Kurono · Y Sawae · T Murakami · J Sugimura ·
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    ABSTRACT: Mechanical components in hydrogen energy systems, such as a fuel cell vehicle and related infrastructures, will operate in high-purity hydrogen. Especially, some seals and valves in fuel cell vehicles should articulate against metal counterface within a pressurized hydrogen gas. However, the effect of high-pressure hydrogen gas on tribological behaviour of materials used in sliding surfaces has not been identified yet. In this study, unfilled polytetrafluoroethylene (PTFE) pins and 316L austenitic stainless-steel discs were exposed to high-pressure hydrogen gas and then the chemical and physical changes in their surface and the tribological characteristics were investigated.
    ARCHIVE Proceedings of the Institution of Mechanical Engineers Part J Journal of Engineering Tribology 1994-1996 (vols 208-210) 03/2010; 224(3):285-292. DOI:10.1243/13506501JET642 · 0.92 Impact Factor
  • Y. Sawae · A. Yamaguchi · K. Nakashima · T. Murakami · J. Sugimura ·
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    ABSTRACT: Wear behavior of polymeric sealing material sliding against austenitic stainless steel was evaluated within gaseous hydrogen atmosphere to ensure the durability and longevity of polymeric seals used in fuel cell vehicles and related hydrogen infrastructures. In this study, unfilled polytetrafluoroethylene (PTFE) was considered as a representative polymeric material for seals and its wear behavior was evaluated by using 3pin-on-disk wear tester coupled with the environmental test chamber. Results indicated that the specific wear rate of unfilled PTFE became significantly smaller in gaseous hydrogen compared with that in air. However, the specific wear rate further decreased in argon gas. Optical microscopy and XPS analysis of the disk specimen surface indicated that the wear behavior of PTFE highly depended on the transfer film formation on the sliding counterface. Notable influences of gaseous hydrogen on the formation process of PTFE transfer film and subsequent wear behavior could be postulated from XPS spectra.
    STLE/ASME 2008 International Joint Tribology Conference; 01/2008