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1997 Fiscal Year Final Research Report Summary

Synergistic effect on spacetribology in the low earch orbit

Research Project

Project/Area Number 08455082
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Research Field 設計工学・機械要素・トライボロジー
Research InstitutionOsaka University

Principal Investigator

OHMAE Nobuo  Faculty of Engineering, Osaka University, Associate Professor, 工学部, 助教授 (60029345)

Co-Investigator(Kenkyū-buntansha) SHIMURA Takayoshi  Faculty of Engineering, Osaka University, Research Associate, 工学部, 助手 (90252600)
TAGAWA Masahito  Faculty of Engineering, Osaka University, Research Associate, 工学部, 助手 (10216806)
Project Period (FY) 1996 – 1997
Keywordsatomic oxygen / space environmental effect / tribology / low earth orbit / synergy / UV / MoS_2
Research Abstract

The purpose of this project is to clarify the synergistic effect of atomic oxygen (AO) and the other environmental factors, such as ultraviolet (UV) light or X-rays, in the tribology of satellites used in low earth orbital (LEO) environment. An ion beam type and a laser induced breakdown type AO sources are used in this study to generate energtic AO beam in the laboratory. The research results obtained in this project are as follows :
1. The reaction efficiency of AO with the polyimide film formed by a spin-coating technique is influenced by UV irradiation. Only in the simultaneous irradiation of AO and UV,significant mass loss and CO_2 formation is detected. This research result suggests the photo-assisted chemical reaction of the functional groups such as carbonyl, which absorbs UV light, occurs at the AO bombarded polymer surfaces where carbonyl is formed by AO attacks.
2. When AO hits MoS_2 (0001) surface, So is formed. This volatile product is detected by a quadrupole mass spectrometer during AO beam exposure on MoS_2 (0001). However, the rate of evaporation is not linear with time. This is probably due to the low diffusion rate of AO into the MoS_2 bulk, i.e., reaction is limited only at the very surface region where only limited amount of S is existed.
3. Tribological properties of MoS_2 (0001) is not suffered by AO attack very much. We see maximum 40% increase of initial friction after AO exposure. However, similar effect is also observed even before AO exposure. Certain percentage of this effect is dur to wear track formation. This effect obviously depends on the sliding system and materials' constants. We need to know how much AO influences to the actual sliding component, because the effect of AO on the tribological property of sputtered MoS_2 may be different with single crystal. Further research on this point must be necessary.

  • Research Products

    (14 results)

All Other

All Publications (14 results)

  • [Publications] H.Kinoshita et al.: "Hyperthermal atomic oxygen interaction with highly oriented pyrolytic graphite studied by scanning tunneling microscopy" Proc.7th lnternational Symposium on Materials in a Space Environment. ESA SP-399. 211-216 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] M.Tagawa et al.: "Oxidation of room temperature silicon(001)surfaces in a hyperthemal atomic oxygen" Proc.7th International Symposium on Materials in a Space Environment. ESA SP-399. 225-229 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] N.Ohmae et al.: "Space tribology activities in Japan-Laboratory data and flight experiment aboard SFU/EFFU" Proc.7th International Symposium on Materials in a Space Environment. ESA SP-399. 387-391 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] 田川 雅人 他: "スペーストライボロジーの現状と将来" 生産と技術. 50巻1号. 27-30 (1997)

    • Description
      「研究成果報告書概要(和文)」より
  • [Publications] Tagawa M., Ohmae N.: "Present status and future perspectives of the spacetribology" Production and Technologies. Vol.50, No.1. 27-30 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kinoshita H., Ikeda J., Tagawa M., Umeno M., Ohmae N.: "A fast Atomic Oxygen Beam Facility with Insitu Testing /analysis Capabilities" Review of Scientific Instruments. (in printing). (1998)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Kinoshita H., Ikeda J., Tagawa M., Umeno M., Ohmae N.: "Hyperthermal Atomic Oxygen Interaction with Highly Oriented Pyrolytic Graphite Studied by Scanning Tunneling Microscopy" Proceedings of the 7th International Symposium on Materials in a Space Environment, June 1997, Toulouse, France. ESASP399. 211-216

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ohmae N., Tagawa M., Kinoshita H., Ikeda J., Arita M., Kishi K., Shibata M.: "Space Tribological Activities in Japan, -Laboratory Data and Flight Experiment aboard SFU/EFFU" Proceedings of the 7th International Symposium on Materials in a Space Environment, June 1997, Toulous, France. ESASP399. 387-389

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tagawa M., Ema T., Kinoshita H., Umeno M., Ohmae N., Minton T.K.: "Oxidation of Room Temperature Silicon (001) Surfaces in a Hyperthermal Atomic Oxygen Beam" Proceedings of the 7th International Symposium on Materials in a Space Environment, June 1997, Toulouse, France. ESASP399. 225-229

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tagawa M., Kinoshita H., Umeno M., Ohmae N.: "Recent Development of the Laser Induced Breakdown Type Atomic Oxygen Source at Osaka University" Proc.20th International Symposium on Space Technology and Science, May 1996, Paper #96-b-41.

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ohmae N., Tagawa M., Arita M.: "Effect of the Irradiation of Atomic Oxygen on Tribology in a Low Earth Orbit" Proceedings of the Intertribo 96, Vysoke Tatry, Slovak Republic, May. 87-90 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tagawa M., Umeno M., Ohmae N.: "Atomic Oxygen Sources Developed at Osaka University" Collection of Abstracts, Methodologies for Ground Simulation of the Space Environment, Southampton, UK,June. 3 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Tagawa M., Matsushita M., Suetomi T., Umeno M., Ohmae N.: "A Consideration of Synergetic Testing Condition of Atomic Oxygen and Solar Radiation on Materials" Collection of Abstracts, Methodologies for Ground Simulation of the Space Environment, Southampton, UK,June. 15 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
  • [Publications] Ohmae N., Kinoshita H., Matsushita M., Umeno M., Tagawa M.: "Differences in "In-situ" and "Ex-situ" Tribological Ground Testing of Atomic Oxygen Effects in LEO Environment" Collection of Abstracts, Methodologies for Ground Simulation of the Space Environment, Southampton, UK,June. 37 (1996)

    • Description
      「研究成果報告書概要(欧文)」より

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Published: 1999-03-16  

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