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Superlubricity of silicon-based ceramics realized by controlling atomic-scale interfacial phenomena and structures

Research Project

Project/Area Number 22K20413
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0301:Mechanics of materials, production engineering, design engineering, fluid engineering, thermal engineering, mechanical dynamics, robotics, aerospace engineering, marine and maritime engineering, and related fields
Research InstitutionOsaka Metropolitan University

Principal Investigator

Kuwahara Takuya  大阪公立大学, 大学院工学研究科, 講師 (10851917)

Project Period (FY) 2022-08-31 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Keywordsセラミクス / 超潤滑 / 分子シミュレーション / 量子化学 / ダイヤモンドライクカーボン / 固体潤滑 / アモルファスカーボン / 分子動力学法 / 量子化学計算 / トライボケミストリー
Outline of Research at the Start

機械システムの接触・摺動部における摩擦・摩耗は、その耐久性・信頼性を著しく低下させる。シリコン系セラミクスは、優れた摩擦・摩耗特性を有することから、従来の流体潤滑剤に替わる固体潤滑剤として期待されている。しかし、過酷環境において超潤滑状態を実現する上で、原子レベルでのメカニズム・界面構造の解明が急務となっている。本研究では、原子論的シミュレーションを活用することで、シリコン系セラミクスの超潤滑発現の鍵を握る原子レベルの界面現象・構造を解明し、その発現条件を特定する。さらに、実験による実証を行い、原子・ナノスケールの界面現象・構造を制御したシリコン系セラミクスの超潤滑システムの実現を目指す。

Outline of Final Research Achievements

Superlubricity of silicon-based ceramics sliding against hydrogenated amorphous carbon (a-C:H) has been observed in ultrahigh vacuum. Combined experiments and simulations reveal that transfer of a thin hydrogenated amorphous carbon layer onto the ceramic surface and formation of the sliding interface between two carbonaceous layers are necessary.A stable passivating a-C:H film can only be transferred if, after initial cold welding of the tribological interface, the plastic shear deformation is localized within the a-C:H coating. This occurs if the yield shear stress for plastic flow of a-C:H is lower than that of the ceramic and of the shear strength of the a-C:H-ceramic interface. While the importance of a relatively high hydrogen content to achieve an efficient passivation of a-C:H surfaces in a vacuum is well-documented, this work reveals how the hydrogen content is also crucial for obtaining a stable a-C:H transfer film. These results can be extended to glass, SiC, and steel.

Academic Significance and Societal Importance of the Research Achievements

移着膜形成は、摩擦後の表面に一般的に観察される現象であり、低摩擦化の寄与が知られていた。一方、そのメカニズムや制御方針に関しては、ほとんど知られていなかった。そこで本研究では、シミュレーションによりその原子レベルのメカニズムを明らかにし、また水素含有量の制御により移着膜の形成及び摩擦特性を制御できることを見出した。また、得られた知見が他材料へ適用可能であることを示していることから、セラミクスに限らず、様々なトライボロジー材料の低摩擦を無潤滑環境下で引き出すことが可能になると考えられる。

Report

(3 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • Research Products

    (8 results)

All 2024 2023 Other

All Int'l Joint Research (4 results) Journal Article (1 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 1 results,  Open Access: 1 results) Presentation (3 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results)

  • [Int'l Joint Research] Fraunhofer IWM(ドイツ)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] Ecole Centrale de Lyon(フランス)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] Fraunhofer IWM(ドイツ)

    • Related Report
      2022 Research-status Report
  • [Int'l Joint Research] Ecole Centrale de Lyon(フランス)

    • Related Report
      2022 Research-status Report
  • [Journal Article] Superlubricity of Silicon-Based Ceramics Sliding against Hydrogenated Amorphous Carbon in Ultrahigh Vacuum: Mechanisms of Transfer Film Formation2024

    • Author(s)
      Kuwahara Takuya、Long Yun、Sayilan Aslihan、Reichenbach Thomas、Martin Jean Michel、De Barros Bouchet Maria-Isabel、Moseler Michael、Moras Gianpietro
    • Journal Title

      ACS Applied Materials & Interfaces

      Volume: 16 Issue: 6 Pages: 8032-8044

    • DOI

      10.1021/acsami.3c16286

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Superlubricity of Silicon-based Ceramics Controlled by Interfacial Mechanochemistry2023

    • Author(s)
      Takuya Kuwahara
    • Organizer
      International Tribology Conference Fukuoka 2023
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Mechanisms of Transfer Film Formation at the Sliding Interface Between Silicon-based Ceramics and Hydrogenated Amorphous Carbon2023

    • Author(s)
      Takuya Kuwahara
    • Organizer
      Tribochemistry Beppu
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] シリコン系セラミクス/DLC摩擦界面における超潤滑メカニズム2023

    • Author(s)
      桑原卓哉
    • Organizer
      トライボロジー会議2023春東京
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research

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Published: 2022-09-01   Modified: 2025-01-30  

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