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Study on hydrogen diffusion in steels induced by tribochemical decomposition of lubricants and the depression effect of DLC coatings on hydrogen diffusion

Research Project

Project/Area Number 17K06130
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Design engineering/Machine functional elements/Tribology
Research InstitutionKansai University

Principal Investigator

Lu Renguo  関西大学, システム理工学部, 准教授 (90758210)

Project Period (FY) 2017-04-01 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2018: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2017: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Keywordsトライボロジー / 水素脆化 / 軸受 / 水素侵入 / トライボ化学分解 / ダイアモンドライクカーボン / ダイヤモンドライクカーボン / トライボケミカル分解 / 潤滑油 / DLC / 機械要素 / 表面界面物性
Outline of Final Research Achievements

Bearing failure is often accompanied by hydrogen embrittlement, which was caused by hydrogen diffusion in steel. The aim of this project was to declare the effect of DLC coating on preventing hydrogen diffusion. Deuterated lubricants were used to discriminate between the original hydrogen in steel and the hydrogen generated from lubricant decomposition. After friction tests of thrust bearings, the deuterium distribution on the cross section of the raceway was analyzed using Tof-SIMS. The highest concentration of deuterium was always near the raceway surface, and the concentration decreased gradually as the depth was increased. To protect steels against the ingress of hydrogen, the effect of DLC coating, which has a low diffusion coefficient of hydrogen, was studied. DLC reduced but did not completely prevent the ingress of hydrogen, which resulted from the reduction in the amount of hydrogen generated from the tribochemical and thermal decomposition of lubricants.

Academic Significance and Societal Importance of the Research Achievements

本研究では,トライボ材料選択にフレキシビリティーの高い表面改質法を用いて,その水素侵入防止の適用可能性に着目した.その結果,DLCコーティングによる水素侵入を抑制する効果の有効性が明らかになった.従って,材料表面における水素侵入による水素脆化を防止するとともに,十分な低摩擦係数と耐摩耗性を発見するコーティング膜を付与した改質表面技術を確立できた.本研究により,産業界で課題となってきた水素脆化型の早期転動疲労剥離の問題を解決でき,燃費向上や省エネルギーなどに貢献できる.

Report

(4 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (10 results)

All 2019 2018 2017

All Presentation (10 results) (of which Int'l Joint Research: 3 results)

  • [Presentation] Study of Hydrogen Diffusion in Bearing Steel and the Segregation Effect of DLC2019

    • Author(s)
      Renguo Lu, Hiroshi Tani, Norio Tagawa, Shinji Koganezawa
    • Organizer
      International Conference on Mechanical Design and History of Technology 2019 (ICMDHT-2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] A Study of Diffusion and Segregation of Hydrogen in Bearing Steels2019

    • Author(s)
      Renguo Lu, Sora Shiode, Takayuki Hamada, Hiroshi Tani, Norio Tagawa, Shinji Koganezawa
    • Organizer
      International Tribology Conference Sendai 2019 (ITC Sendai2019)
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] DLCコーティングにおける潤滑油のトライボ化学分解2019

    • Author(s)
      濱田昂幸,呂仁国,谷弘詞,多川則男,小金沢新治
    • Organizer
      関西潤滑懇談会7月例会
    • Related Report
      2019 Annual Research Report
  • [Presentation] 軸受鋼への水素侵入挙動およびDLCの水素侵入抑制効果に関する研究2019

    • Author(s)
      塩出 空,濱田 昂幸,呂 仁国,谷 弘詞,小金沢 新治,多川 則男
    • Organizer
      日本機械学会関西支部第94期定時総会講演会
    • Related Report
      2018 Research-status Report
  • [Presentation] Study of the Hydrogen Diffusion and Segregation into Thrust Bearing Steel Using TOF-SIMS2018

    • Author(s)
      Renguo Lu, Hiroshi Tani, Norio Tagawa and Shinji Koganezawa
    • Organizer
      The 18th Nordic Symposium on Tribology (Nordtrib2018)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 同位体トレーサー法による軸受鋼への水素侵入挙動に関する研究2018

    • Author(s)
      塩出空,濱田昂幸,呂仁国,谷弘詞,小金沢新治,多川則男
    • Organizer
      日本機械学会2018年度年次大会
    • Related Report
      2018 Research-status Report
  • [Presentation] TOF-SIMSによる水素とDLCのトライボ化学反応の観察2018

    • Author(s)
      濱田昂幸,塩出空,呂仁国,谷弘詞,多川則男,小金沢新
    • Organizer
      関西潤滑懇談会7月例会
    • Related Report
      2018 Research-status Report
  • [Presentation] DLCコーティングによる軸受鋼への水素侵入の抑制に関する研究 (第2報)-抑制効果のメカニズムの解明2018

    • Author(s)
      塩出空,濱田昂幸,呂仁国,谷弘詞,小金沢新治,多川則男
    • Organizer
      トライボロジー会議2018 秋
    • Related Report
      2018 Research-status Report
  • [Presentation] DLCコーティングによる軸受鋼への水素侵入の抑制に関する研究2017

    • Author(s)
      塩出 空,初鳥貴広,呂 仁国,谷 弘詞,多川則男,小金沢新治
    • Organizer
      関西潤滑懇談会7月例会―第3回ポストー発表会
    • Related Report
      2017 Research-status Report
  • [Presentation] DLCコーティングによる軸受鋼への水素侵入の抑制に関する研究2017

    • Author(s)
      塩出 空,呂 仁国,谷 弘詞,多川則男,小金沢新治
    • Organizer
      トライボロジー会議2017秋
    • Related Report
      2017 Research-status Report

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Published: 2017-04-28   Modified: 2021-02-19  

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