Effect of Surface Energies of DLC Films to Ito Tribological Properties under Lubricated Condition
| Project/Area Number |
18560144
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Design engineering/Machine functional elements/Tribology
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| Research Institution | Doshisha University |
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Principal Investigator |
MATSUOKA Takashi Doshisha University, Faculty of Engineering, Professor (80173813)
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| Co-Investigator(Kenkyū-buntansha) |
HIRAYAMA Tomoko Doshisha University, Faculty of Engineering, Lecturer (00340505)
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| Project Period (FY) |
2006 – 2007
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| Project Status |
Completed (Fiscal Year 2007)
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| Budget Amount *help |
¥3,410,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥210,000)
Fiscal Year 2007: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Fiscal Year 2006: ¥2,500,000 (Direct Cost: ¥2,500,000)
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| Keywords | Tribology / Lubricant / Neutron Reflectometry / Solid-Liquid Interface / Structure Analysis / Diamond-Like Carbon / Surface Energy / Friction Property / 中性子線 / 反射率法 / 最表面 / DLC膜 |
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| Research Abstract |
Lubricants generally contribute to achieve low friction on sliding surfaces in many kinds of mechanical components. It is well known that lubricants may form some absorption layers near surfaces. Though macroscopic relationships between lubricants (or absorption layers) and tribological properties have been studied everywhere, there are no reports on densities and thicknesses of the special ultrathin layers formed at the solid-liquid interface.
In our laboratory, densities of lubricants near solid surfaces are directly measured by neutron reflectometry and discussed in the series of studies. The neutron can go deeply into the inner region of common metals because neutrons physically interact not with electrons but with atomic nuclei, thus the in-situ observations of solid-liquid interface can be easily realized. The reflectometry is generally utilized for analysis of vertical microstructures of a sample or the interface through the reflectivity profile. In this paper, three kinds of DLC
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films having different surface energies were prepared as base materials, and water was selected as a lubricant. The DLC films were called 'normal DLC', 'hydrophilic DLC' and 'hydrophobic DLC'; the first was deposited by plasma CVD using CH4 gas on a silicone block, the second was treated by oxygen gas plasma on the surface of the normal DLC as post-processing treatment, and the third was deposited by plasma CVD using CH_4 and C_2F_6. The DLC films were soaked in water in a specially-designed sample holder, and the neutron beam was directly entered to the DLC/water interface from the side of silicone block. Then, the instrument we used was a neutron reflectometer 'MINE' in Japan Atomic Energy Agency (JAEA), and the neutron reflectivity profiles from the interface between DLC films and water were obtained by the instrument. Through an analytical fitting approach with Parratt's theory to the obtained profiles, we can see that: (1) the thickness of hydrophilic layer (O_2 plasma treated layer) formed in the surface of hydrophilic DLC is 15nm, (2) water is infiltrated from the surface to the interior of hydrophilic DLC until 15 nm-depth, and the thickness of dense water layer infiltrated in the top surface of hydrophilic DLC is 2nm, and (3) the thickness of low-density water layer on the surface of hydrophobic DLC is 3nm, and its density is almost half of normal water. Less
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Report
(3 results)
Research Products
(36 results)
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[Presentation] 中性子反射率法によるDLC膜/潤滑剤界面のナノ構造解析2008
Author(s)
平山 朋子, 鳥居 誉司, 松岡 敬, 井上 和子, 海老 澤徹, 田崎 誠司, 日野 正裕, 鳥飼 直也
Organizer
日本機械学会IIP2008 情報・知能・精密機器部門講演会講演論文集
Place of Presentation
東工大大岡山キャンパス
Year and Date
2008-03-18
Description
「研究成果報告書概要(和文)」より
Related Report
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[Presentation] 中性子反射率法による物質/潤滑剤界面のナノ構造解析2008
Author(s)
平山 朋子, 鳥居 誉司, 松岡 敬, 井上 和子, 海老 澤徹, 田崎 誠司, 日野 正裕, 鳥飼 直也
Organizer
第11回トライボケミストリー討論会
Place of Presentation
同志社大学
Year and Date
2008-03-07
Description
「研究成果報告書概要(和文)」より
Related Report
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[Presentation] 中性子反射率法によるDLC膜/水界面の構造解析2007
Author(s)
平山 朋子, 宇野 共生, 松岡 敬, 井上 和子, 海老 沢徹, 田崎 誠司, 日野 正裕, 鳥飼 直也
Organizer
第45回同志社大学理工研研究発表会
Place of Presentation
けいはんなプラザ
Year and Date
2007-12-07
Description
「研究成果報告書概要(和文)」より
Related Report
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