2023 Fiscal Year Final Research Report
Evaluation of temperature and friction effect on transformation of molecular films of organic lubricant additives into metallic soap films
| Project/Area Number |
22K14171
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| Research Category |
Grant-in-Aid for Early-Career Scientists
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| Allocation Type | Multi-year Fund |
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| Review Section |
Basic Section 18040:Machine elements and tribology-related
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Project Period (FY) |
2022-04-01 – 2024-03-31
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| Keywords | トライボロジー / 原子間力顕微鏡 / 中性子反射率測定 / 有機系潤滑添加剤 / 脂肪酸 / 吸着分子膜 / 金属石鹸膜 / ナノ腐食 |
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| Outline of Final Research Achievements |
The relationship between the microstructure of the lubricant/metal interface obtained by neutron reflectometry (NR) and the nanotribological properties obtained by atomic force microscopy (AFM) has been evaluated, with a focus on in-situ analysis in lubricants. When copper with an oxidised surface was used, a thick metallic soap film formed on the copper surface over time, resulting in a low coefficient of friction. In the NR experiments, when stearic acid was used, a nano-level reduction in film thickness on the copper surface was observed when heated to 120 °C, whereas no significant reduction in film thickness was observed when deuterated stearic acid was used. This result suggests that the film formed by the stearic acid may have been as thick as the amount of corrosion on the copper surface.
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| Free Research Field |
トライボロジー
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| Academic Significance and Societal Importance of the Research Achievements |
吸着分子膜がどの段階でどのように金属石鹸膜へと変化し，吸着分子膜と比較してどれほど摩擦を抑制できるのか？という根本的な疑問の解明に向け，実際の摩擦場での有機系潤滑添加剤のふるまいを詳細に評価した．機械の摺動部や金属加工では基本的に熱の発生を伴うため，有機系添加剤が形成する膜の状態変化への温度影響の調査は，高温環境下においても低摩擦を発揮する高性能な添加剤や，摺動部への過度な腐食摩耗を生じさせない添加剤を設計するための指針となり，最終的には機械や金属加工における摩擦ロスの抑制の実現につなげることが可能である．
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