Ultra-low Friction Behavior during Gas Adsorption to a Hard Amorphous Carbon Film

硬质非晶碳膜气体吸附过程中的超低摩擦行为

基本信息

批准号：
63550105
负责人：
IDE Takashi
金额：
$ 1.34万
依托单位：
Ehime University
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1988
资助国家：
日本
起止时间：
1988 至 1989
项目状态：
已结题

项目摘要

On a hard amorphous carbon film prepared by electrostatic impact-deposition of carbon black particle, the ultra-low friction behavior under the surface adsorption of gas molecules was investigated by evaluating the structure and the boundary lubrication properties of the film, and the following results are obtained;1.The carbon film is composed with graphitic phase of starting material and its impact-subjected one of amorphous structure, including numerous defects such as dangling bond of carbon. For the film heating beyond 100 C, the amorphous structure gradually transforms to graphitic phase, which reads to the increase in the density of dangling bond.2.Surface adsorption condition for ultra-low friction was revealed with a sliding friction experiment in several atmospheric gases, using the reciprocating motion between coated ball and disc specimens in the manner that the contact point describes a same locus repeatedly. And the following results are obtained; (1)Very low friction was attained for the density state of gas adsorption of hydrogen, water and nitrogen, especially in hydrogen atmosphere the frictional coefficient became of below 0.01. However, it is proved that oxygen gas promotes the interfacial adhesion of carbon film under frictional action. (2)It was clarified that the boundary lubrication in air is considerably affected by water adsorption. In the present experimental condition of reciprocating friction, the low water adsorption for low friction can be attained in an appropriate equilibrium of the desorption and adsorption rates; the former can be dominated by the friction condition, and the latter can be by the atmospheric condition and film quality such as the content of graphite and surface radical.

在静电冲击沉积炭黑颗粒制备的硬质非晶碳薄膜上，通过评价薄膜的结构和边界润滑性能，研究了气体分子表面吸附下的超低摩擦行为，结果如下：得到的；1.碳膜由起始材料的石墨相及其经受冲击的非晶结构的相组成，包括大量的缺陷，例如碳的悬挂键。当薄膜加热到100℃以上时，非晶结构逐渐转变为石墨相，这表明悬挂键密度增加。2.通过在几种大气气体中的滑动摩擦实验揭示了超低摩擦的表面吸附条件，利用涂层球和圆盘样本之间的往复运动，接触点重复描述相同的轨迹。并得到以下结果； (1)氢气、水和氮气的气体吸附密度状态达到很低的摩擦力，特别是在氢气气氛下摩擦系数达到0.01以下。然而，事实证明，氧气在摩擦作用下促进了碳膜的界面粘附。 (2)明确了空气中的边界润滑很大程度上受水分吸附的影响。在目前往复摩擦的实验条件下，在解吸和吸附速率的适当平衡下可以实现低摩擦的低水吸附；前者可以由摩擦条件决定，后者可以由大气条件和膜质量如石墨和表面自由基的含量决定。