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Tribological study of the solid lubricant surface under high vacuum and the sliding mechanism

高真空下固体润滑剂表面摩擦学及滑动机理研究

基本信息

批准号：
12650150
负责人：
HONDA Fumihiro
金额：
$ 2.69万
依托单位：
Toyota Technological Institute
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2000
资助国家：
日本
起止时间：
2000 至 2002
项目状态：
已结题

项目摘要

This project is focused on (1) the contribution of chemical interaction between contact surfaces to the coefficient of friction, and (2) designing a surface structure for long-life sliding under vacuum circumstance. This project was carried out successfully and we awe to this grant supported this project.We investigated for the friction of macroscopic diamond sphere (3mm in diameter) sliding with ultra-thin Ag layers between 1-100 nm thick. We found a minimum coefficient of friction on the 1-8 nm-thick Ag layers deposited on Si(111) substrate. The thin Ag films were not excluded out of the sliding track by sliding during at least 1000 reciprocal cycles and the ultra-low coefficient of friction 0.01 or less lasted over these cycles. By our precise observation of the non-slide and slide surfaces in terms of AES, RHEED and SEM techniques, we discussed for the plausible mechanism of the ultra-low friction phenomenon of the atomically thin Ag layers. The ultra-low friction found for MoS_2 and graphite were proved different mechanism with the relevant phenomena, because the Ag atomic planes are a randomly stacked on the as-deposited Ag layers and exactly non-wearing is occurred by iterated sliding on it. We proposed this is due to the Ag atoms are mobile along the Si(111) surface with very low energy even at room temperature. We have reached to a conclusion experimentally that a self-recovering sliding plane can be formed on the slid surfaces by reconstructing two-dimensional Ag fine particles.

该项目的重点是（1）接触表面之间的化学相互作用对摩擦系数的贡献，以及（2）设计真空环境下长寿命滑动的表面结构。这个项目成功地进行了，我们对这笔资助对这个项目的支持感到敬畏。我们研究了宏观金刚石球（直径 3 毫米）与厚度在 1-100 nm 之间的超薄银层滑动的摩擦力。我们发现沉积在 Si(111) 基底上的 1-8 nm 厚的 Ag 层的摩擦系数最小。在至少 1000 个往复循环中，Ag 薄膜并未因滑动而被排除在滑动轨道之外，并且在这些循环中保持 0.01 或更小的超低摩擦系数。通过 AES、RHEED 和 SEM 技术对非滑动和滑动表面的精确观察，我们讨论了原子薄银层超低摩擦现象的合理机制。 MoS_2和石墨的超低摩擦现象被证明是不同的机制和相关现象，因为Ag原子平面是随机堆叠在沉积的Ag层上，并且通过在其上反复滑动而发生完全无磨损。我们认为这是因为即使在室温下，Ag 原子也能以非常低的能量沿着 Si(111) 表面移动。我们通过实验得出结论：通过重构二维银细颗粒，可以在滑动表面上形成自恢复滑动面。