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Evaluation of practical performance of molecularly thin lubricant films having textures of nano-plateaus and nano-recesses

具有纳米高原和纳米凹陷纹理的分子薄膜润滑膜的实用性能评价

基本信息

批准号：
18206018
负责人：
MITSUYA Yasunaga
金额：
$ 20.38万
依托单位：
Nagoya Industrial Science Research Institute (2007)Nagoya University (2006)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (A)
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

项目摘要

To evaluate practical performance of perfluoropolyether (PFPE) lubricant films having texture of nano-plateaus and nano-recesses formed by ultraviolet (UV) ray irradiation, we clarified the mechanism of formation of the texture and optimum conditions for forming the texture on diamond like carbon (DLC) surface. For this purpose, an ultra-high sensitive friction tester was developed. Based on the sliding-induced depletion and replenishment tests, the present textured lubricant film was found to have a special advantage of adjustable tribo-performances. The results are summarized as follows.1) Mechanism of formation of nano-texture i) Experimental approach: For three kinds of PFPE lubricants (UV reactive; Fomblin AM type, polar; Zdol and non-polar; Z) coated on DLC surfaces for magnetic disk use, the irradiation time was optimized and the effects of UV irradiation were compared. In addition, both of irradiation methods; UV irradiation after/before lubricant coating, were confirmed to be … More effective.ii) Molecular simulation approach : Using the smart Monte Carlo method, formation of lubricant texture was reproduced using a local distribution of solid and liquid molecules interaction caused by solid surface irregularity. Applying the molecular-dynamic simulation to solid/liquid interface, formation of lubricant texture was reproduced using a local distribution of the interaction potential between polar end groups of lubricant molecules and carbon molecules of solid surface.2) Evaluation of depletion and replenishment of nano-texture lubricant film. From the results of the sliding test, IN irradiation was confirmed to provide advantages of suppressed depletion without decreasing replenishment performance. Comparing parallel/perpendicular patterns and no pattern, it was found that, as for depletion, the with-pattern case was equivalents to the no-pattern case, while as for depletion, the relationships where the perpendicular case ≒ no pattern>the parallel case held.3) Development of ultra-high sensitive friction tester A new friction tester was constituted by an accurate disk rotation spindle supported by an air bearing and driven by a build-in direct DC motor, and a precise sliding pin-loading mechanism driven by a compact PZT actuator with displacement magnification mechanism. This attained high resolutions of 2.5 μN for the adhesion force and 4μN for the friction force. Less

为评价紫外光辐照下全氟聚醚（PFPE）润滑膜的实用性能，阐明了类金刚石（DLC）表面纳米台阶和纳米凹坑织构的形成机理和最佳织构形成条件。为此，研制了一种超高灵敏度摩擦试验机。通过摩擦磨损试验发现，该织构润滑膜具有摩擦学性能可调的独特优势。主要研究结果如下：1）纳米织构形成机理i）实验方法：对三种PFPE润滑剂（UV反应型; Fomblin AM型、极性; Zdol和非极性; Z）涂覆在磁盘用DLC表面，优化辐照时间，比较UV辐照效果。此外，两种辐照方法;润滑剂涂覆后/之前的UV辐照，被证实是有效的。 ...更多信息 ii）分子模拟方法：使用智能蒙特卡罗方法，使用由固体表面不规则性引起的固体和液体分子相互作用的局部分布来再现润滑剂纹理的形成。将分子动力学模拟应用于固/液界面，利用润滑剂分子极性端基与固体表面碳分子相互作用势的局部分布再现了润滑剂织构的形成过程。2）纳米织构润滑膜的损耗和补充评价。从滑动测试的结果，IN照射被证实提供抑制消耗而不降低补充性能的优点。比较平行/垂直图案和无图案，发现对于耗尽，有图案的情况等同于无图案的情况，而对于耗尽，垂直情况下无模式>平行情况的关系。3）超高灵敏度摩擦试验机是一种新型摩擦试验机，它是由空气轴承支承的精密圆盘旋转主轴，内置直流电动机，精密的滑动销加载机构，由一个紧凑的PZT驱动器驱动位移放大机构。该方法获得了2.5 μN的粘附力和4μN的摩擦力的高分辨率。少