Effect of Surface Energies of DLC Films to Ito Tribological Properties under Lubricated Condition

润滑条件下DLC膜表面能对Ito摩擦学性能的影响

• 批准号: 18560144
• 负责人: MATSUOKA Takashi
• 金额: $ 2.18万
• 依托单位: Doshisha University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2006
• 资助国家: 日本
• 起止时间: 2006 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-18560144/
• 关键词: 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

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 … More 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

润滑剂通常有助于在多种机械部件的滑动表面上实现低摩擦。众所周知，润滑剂可能在表面附近形成一些吸收层。尽管人们对润滑剂（或吸收层）与摩擦学性能之间的宏观关系进行了研究，但目前还没有关于固液界面处形成的特殊超薄层的密度和厚度的报道。在我们的实验室中，通过中子反射仪直接测量固体表面附近的润滑剂的密度，并在系列研究中进行了讨论。由于中子物理作用不是与电子而是与原子核发生物理作用，因此中子可以深入普通金属的内部区域，从而可以轻松实现固液界面的原位观测。反射计通常用于通过反射率分布分析样品或界面的垂直微观结构。本文制备了三种不同表面能的DLC薄膜作为基材，并选择水作为润滑剂。 DLC膜被称为“普通DLC”、“亲水性DLC”和“疏水性DLC”；第一个是使用 CH4 气体通过等离子体 CVD 在硅块上沉积，第二个是在普通 DLC 表面上进行氧气等离子体处理作为后处理处理，第三个是使用 CH_4 和 C_2F_6 通过等离子体 CVD 沉积。将DLC薄膜浸泡在专门设计的样品架中的水中，中子束从硅胶块侧面直接进入DLC/水界面。然后，我们使用的仪器是日本原子能机构（JAEA）的中子反射计“MINE”，通过该仪器获得了DLC膜与水之间界面的中子反射率剖面。通过Parratt理论对得到的剖面进行分析拟合，可以看出：（1）亲水性DLC表面形成的亲水层（O_2等离子处理层）的厚度为15nm，（2）水从亲水性DLC表面向内部渗透直至15nm深度，以及渗透到亲水性DLC顶面的致密水层的厚度。 亲水性DLC为2nm，(3)疏水性DLC表面低密度水层厚度为3nm，其密度几乎是普通水的一半。较少的

项目成果

中性子反射率法による物質最表面近傍における潤滑剤の密度測定(第1報異なる表面エネルギーを有するDLC膜と水の場合)

使用中子反射法测量材料最外表面附近的润滑剂密度（首次报告：具有不同表面能的DLC膜和水）

• 发表时间: 2007
• 期刊: トライボロジスト 52,12
• 作者: 平山 朋子;宇野 共生;松岡 敬;井上 和子;海老 澤徹;田崎 誠司;日野 正裕;鳥飼 直也
• 通讯作者: 鳥飼 直也

Observation of surface roughness at the interface by neutron reflectometry

通过中子反射仪观察界面处的表面粗糙度

• 发表时间: 2006
• 期刊: Physica B:Condensed Matter 285-286
• 作者: Kazuko Inoue;Tomoko Hirayama;Toru Ebisawa;Seiji Tasaki;Masahiro Hino
• 通讯作者: Masahiro Hino

中性子反射率法による物質最表面近傍における潤滑剤の密度測定(第1報 異なる表面エネルギーを有するDLC膜と水の場合)

使用中子反射法测量材料最外表面附近的润滑剂密度（第1部分：具有不同表面能的DLC膜和水）

• 发表时间: 2007
• 期刊: トライボロジスト 52,12
• 作者: 平山 朋子;宇野 共生;松岡 敬;井上 和子;海老 澤徹;田崎 誠司;日野 正裕;鳥飼 直也
• 通讯作者: 鳥飼 直也

Heat Resistance of Silicone-Doped DLC Films Deposited by PBIID

PBIID 沉积硅掺杂 DLC 薄膜的耐热性

• 发表时间: 2007
• 期刊: Proc.of Malaysia-Japan International Symposium on Advanced Technology 2007 (CD-ROM)
• 作者: Kimiko Nakai;Syungo Kiyota;Takashi Matsuoka;Tomoko Hirayama;Makoto Asano;Yasuhiro Miki
• 通讯作者: Yasuhiro Miki

Microscopic Observation of Lubrication Phenomena and Its Application to Bearing Technology

润滑现象的显微观察及其在轴承技术中的应用

• 发表时间: 2008
• 作者: Kazuko Inoue;Tomoko Hirayama;Toru Ebisawa;Seiji Tasaki;Masahiro Hino;Tomoko Hirayama
• 通讯作者: Tomoko Hirayama