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2005 Fiscal Year Final Research Report Summary

Superlubricity of nanometer-thick Ag, Au films and the two dimensional structure of the slid surface - Study for designing a slide surface which works in space circumstance

Research Project

Project/Area Number 15360087
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field Design engineering/Machine functional elements/Tribology
Research InstitutionToyota Technological Institute, Undergraduate School of Engineering

Principal Investigator

HONDA Fumihiro  Toyota Technological Institute, Undergraduate School of Engineering, Dept.of Adv.Sci.Technol., 工学部, 教授 (20005953)

Project Period (FY) 2003 – 2005
Keywordsnm-thick Ag / superlubricity / solid lubricant / AES / SOR / diamond slider / ultra high vacuum
Research Abstract

First objective of this work was designing a slide surface which works in a vacuum circumstance. We carried out sliding experiments and analyses of nanometer-thick Ag layers which was deposited on Si, and observed surface structures and characteristics of the slid surfaces. As a result, super lubricity (coefficient of friction : 0.007 at the minimum) was found on it.
Crystal orientation of Ag and crystallographic analyses of the slid surface in ultrahigh vacuum were studied using Auger electron spectroscopy (AES), reflection high energy electron diffraction (RHEED), tunneling electron microscopy (STM), in-situ, and by synclotron orbital radiated X-ray diffraction (SOR-XD), ex-situ. These results revealed that the single atomic layers stack on the slid surfaces, and provided useful information to understand the mechanism of super lubricity. The results were summarized as follows,
(1)If the polycrystalline film of Ag were deposited, Ag(111) planes have faced to random direction. During the … More reciprocal and repeated sliding cycles on it, Ag (111) sliding plane orientated parallel to the sliding plane. Ag crystallites also have grown 10 times in size and recrystallized at room temperature, during sliding, and C planes were stacked layer by layer parallel to the Si sliding direction, as was proved by STM and SOR-XD observations. Ag crystallites conducted, as if Ag films formed liquid layer, but the stacked Ag layers looked complete crystals without any amorphous fractions. Nearly two dimensional film of Ag metal were proved to have a melting point, as low as the room temperature. The observed superlubricity was understood due to the atomic mobility of Ag atoms along the Si(111) surface and on the Ag nm-thick layers.
(2)The Ag atoms were mobile and showed super lubricant function. On the slid surface, therefore, no worn particles were found. The worn particles were supposedly reformed layer structure on the surfaces due to the mobility of the atoms. Ag films were not excluded out or exfoliated by sliding from the sliding tracks, over 1000 cycles of reciprocal sliding.
(3)The results may applicable for sliding surface in space, because the experiments were carried out under ultrahigh vacuum. The test specimens were clean that the test results were reproducible without any contaminants on the surfaces. The results were applicable to clean room machines for semiconductor production, and textile products which use non-oil lubricants.
(4)The results provided very important and fundamental understandings of super lubrication, and chemical interaction between contact surfaces as the most important factor to reduce friction. Less

  • Research Products

    (20 results)

All 2006 2005 2004 Other

All Journal Article (15 results) Book (3 results) Patent(Industrial Property Rights) (2 results)

  • [Journal Article] Crystal orientation changes of Ag thin films on the Si(III) substrate due to tribo-assisted recrystallization2006

    • Author(s)
      K.Akimoto, K.Fukagawa, M.Goto, F.Honda
    • Journal Title

      Thin Solid Films (Accepted for publication)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Effect of nitrogen atoms removal on the friction of the CNx coating against Si3N4 ball in nitrogen gas2006

    • Author(s)
      T.Tokoroyama, M.Goto, N.Umehara, T.Nakamura, F.Honda
    • Journal Title

      Tribology Letters (accepted for publication)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Tribo-assisted reorientation of nanometer-thick Ag film in ultrahigh vacuum environment2006

    • Author(s)
      M.Goto, K.Akimoto, F.Honda, T.Nakahara
    • Journal Title

      I. Mech. E., J.Engineering Tribology (accepted for publication)

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Producing gear teeth with high form accuracy and fine surface finish usng water-lubricated chemical reactions2005

    • Author(s)
      K.Oobayashi, K.Irie, F.Honda
    • Journal Title

      Trib. Internatl. Vol.38, No.3

      Pages: 243-248

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Low wear and friction of nanometer-thick Ag layers on si(III) surfaces2005

    • Author(s)
      F.Honda, M.Goto
    • Journal Title

      Wear vol.259/1-6

      Pages: 730-737

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Producing gear teeth with high form accuracy and fine surface finish using water-lubricated chemical reactions2005

    • Author(s)
      K.Oobayashi, K.Irie, F.Honda
    • Journal Title

      Trib.Internatl. Volo.38 No.3

      Pages: 243-248

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Low wear and friction of nanometer-thick Ag layers on Si(111) surfaces2005

    • Author(s)
      F.Honda, M.Goto
    • Journal Title

      Wear vol.259/1-6

      Pages: 730-737

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Tribological behavior of Ag sub-nanometer-thick film on an Si(III) 7x7 surface at elevated temperatures2004

    • Author(s)
      M.Goto, R.Nakata, F.Honda
    • Journal Title

      Wear vol.256

      Pages: 726-734

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Film thickness effect of Ag lubricant layer in the nano region2004

    • Author(s)
      M.Goto, F.Honda
    • Journal Title

      Wear vol.256

      Pages: 1062-1071

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Morphological effect of epitaxial Ag films with thickness of the order of nanometres on the tribological properties of a single-crystal silicone surface in an ultra-high vacum environment2004

    • Author(s)
      M.Goto, T.Nakahara, F.Honda
    • Journal Title

      Proc. Instn. Mech. Engrs. Part J : J. Engineeing Tribology Vol.218

      Pages: 279-291

    • Description
      「研究成果報告書概要(和文)」より
  • [Journal Article] Tribological behavior of Ag sub-nanometer-thick film on an Si(111) 7x7 surface at elevated temperatures2004

    • Author(s)
      M.Goto, R.Nakata, F.Honda
    • Journal Title

      Wear vol.256

      Pages: 726-734

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Morphological effect of epitaxial Ag films with thickness of the order of nanometers on the tribological properties of a single-crystal silicone surface in an ultra-high vacuum environment2004

    • Author(s)
      M.Goto, T.Nakahara, F.Honda
    • Journal Title

      Proc.Instn.Mech.Engrs.Part J : J.Engineeing Tribology Vol.218

      Pages: 279-291

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Crystal orientation changes of Ag thin films on the Si(111) substrate due to tribo-assisted recrystallization

    • Author(s)
      K Akimoto, K.Fukagawa, M.Goto, F.Honda
    • Journal Title

      Thin Solid Films (Accepted for publication)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Effect of nitrogen atoms removal on the friction of the CNx coating against Si3N4 ball in nitrogen gas

    • Author(s)
      T.Tokoroyama, M.Goto, N.Umehara, T.Nakamura, F.Honda
    • Journal Title

      Tribology Letters (accepted for publication)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Journal Article] Tribo-assisted reorientation of nanometer-thick Ag film in ultrahigh vacuum environment

    • Author(s)
      M.Goto, K.Akimoto.F.Honda, T.Nakahara
    • Journal Title

      I.Mech.E., J.Engineering Tribology (accepted for publication)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Book] "摩擦・磨耗試験とその活用"(部分執筆) 本多文洋 表面分析法とその利用2006

    • Author(s)
      三科博司編集 トライボロジー学会発行
    • Total Pages
      400(20)
    • Publisher
      養賢堂
    • Description
      「研究成果報告書概要(和文)」より
  • [Book] "固体潤滑ハンドブック"(本多文洋 : 部分執筆) 金属薄膜、BN、表面分析、2006年2006

    • Author(s)
      三宅正二郎, 梅田一徳ら監修 トライポロジー学会発行
    • Total Pages
      500(30)
    • Publisher
      養賢堂
    • Description
      「研究成果報告書概要(和文)」より
  • [Book] "Superlubricity"(Partial contribution)2006

    • Author(s)
      Edited by A.Erdemir, J.-M.Martin.
    • Total Pages
      600(25)
    • Publisher
      Erserier, to be published.
    • Description
      「研究成果報告書概要(和文)」より
  • [Patent(Industrial Property Rights)] 摩擦を利用した金属薄膜の選択的配向成長制御の方法2006

    • Inventor(s)
      後藤実, 秋本晃一, 本多文洋
    • Industrial Property Number
      出願中
    • Filing Date
      2006-04-28
    • Description
      「研究成果報告書概要(和文)」より
  • [Patent(Industrial Property Rights)] 研究成果による工業所有権の出願・取得状況 名称「摺動部材用オーバーレイ及びその製造方法」2004

    • Inventor(s)
      後藤実, 本多文洋
    • Industrial Property Rights Holder
      日野自動車(株)豊田工業大学
    • Industrial Property Number
      特願2004-241891
    • Filing Date
      2004-08-23
    • Description
      「研究成果報告書概要(和文)」より

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Published: 2007-12-13  

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