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Development of Self-restoring Ball Bearing for Space Application by Tribo-coating

Research Project

Project/Area Number 16206018
Research Category

Grant-in-Aid for Scientific Research (A)

Allocation TypeSingle-year Grants
Section一般
Research Field Design engineering/Machine functional elements/Tribology
Research InstitutionTohoku University

Principal Investigator

KATO Koji  Tohoku University, Graduate School of Engineering, Professor, 大学院工学研究科, 教授 (50005443)

Co-Investigator(Kenkyū-buntansha) ADACHI Koshi  Tohoku University, Graduate School of Engineering, Associate Professor, 大学院工学研究科, 助教授 (10222621)
ITO Kosuke  Tohoku University, Graduate School of Engineering, Research Associate, 大学院工学研究科, 助手 (40420004)
BOYKO Stoimenov  東北大学, 大学院・工学研究科, 助手 (60361119)
Project Period (FY) 2004 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥48,750,000 (Direct Cost: ¥37,500,000、Indirect Cost: ¥11,250,000)
Fiscal Year 2006: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000)
Fiscal Year 2005: ¥20,670,000 (Direct Cost: ¥15,900,000、Indirect Cost: ¥4,770,000)
Fiscal Year 2004: ¥21,060,000 (Direct Cost: ¥16,200,000、Indirect Cost: ¥4,860,000)
KeywordsSolid Lubricant / Friction control / Tribo-coating / Micro-heater / Self-restoring / Semipermanent life / Assisted friction / Tribo-layer / 低摩擦 / その場修復 / 移着
Research Abstract

A new lubrication method in ultra high vacuum called as in-situ tribo-coating was introduced by our group, and its effectiveness as practical solid lubrication method was clearly shown from the viewpoint of friction coefficient. In this method a thin film of lubricant is formed by short time deposition on a contact interface during the process of friction in vacuum. This method gives unique advantage that the coating can be restored on demand, and endless life of the tribo-element can be achieved.
The ultimate objective of this research is to develop a self-restoration system of lubricant film supplied by the tribo-coating. Following are two key subject in this research to realize the self-restoration system of lubricant for the space mechanisms ;
1.Development of Micro Evaporation Source (MES) with small size (<1 mm),and low power consumption (< 1 W) for the in-situ tribo-coating,
2.Analysis of low friction mechanisms of tribo-coatings of indium
Following are main results of this research.
1.The world smallest evaporation source for indium was developed. The power needed for evaporation of the solid lubricant (indium) with the developed MES was 560 mW.
2.Sufficiently low for practical use friction coefficient of 0.005 was obtained with ball bearing coated by Tribo-coating with the developed MES(500μmx500μm).
3.The tribo-coating film formed on the pin has nano-order composite structure in which the indium of nano size is distributed in matrix of silicon oxide and chromium oxide.
4.A very thin indium film is formed by the distributed nano-size indium without break down like conventional pre-coated thin film. The thinner indium film can give smaller value of friction coefficient than that of conventional solid lubricant.

Report

(4 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • 2004 Annual Research Report
  • Research Products

    (6 results)

All 2007 2005

All Journal Article (6 results)

  • [Journal Article] 宇宙機器のためのトライボコーティング潤滑2007

    • Author(s)
      足立幸志 他
    • Journal Title

      日本設計工学会誌,設計工学 42・1

      Pages: 23-30

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Tribo-coating for Space Mechanisms2007

    • Author(s)
      Koshi Adachi et al.
    • Journal Title

      Journal of Japan Society for Design Engineering Vol.42, No.1

      Pages: 23-30

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] 宇宙機器のためのトライボコーティング潤滑2007

    • Author(s)
      足立幸志
    • Journal Title

      日本設計工学会誌,設計工学 42・1

      Pages: 23-30

    • Related Report
      2006 Annual Research Report
  • [Journal Article] FORMATION MECHANISMS OF TRIBO-COATING FOR LOW FRICTION IN UHV2005

    • Author(s)
      Koshi Adachi et al.
    • Journal Title

      Proceedings of WTC 2005, World Tribology Congress III

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] FORMATION MECHANISMS OF TRIBO-COATING FOR LOW FRICTION IN UHV2005

    • Author(s)
      Koshi Adachi et al.
    • Journal Title

      Proceedings of WTC 2005, World Tribology Congress III WTC2005-64274

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] FORMATION MECHANISMS OF TRIBO-COATING FOR LOW FRICTION IN UHV2005

    • Author(s)
      Koshi Adachi, Hisakazu, Koji Kato
    • Journal Title

      Proceedings of WTC 2005,World Tribology Congress III

    • Related Report
      2005 Annual Research Report

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Published: 2004-04-01   Modified: 2016-04-21  

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