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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.

在静电冲击沉积法制备的硬质非晶碳膜上，通过对膜的结构和边界润滑性能的评价，研究了气体分子表面吸附作用下的超低摩擦行为，得到了如下结果：1.该碳膜由起始材料的石墨相和其经受冲击的非晶结构的石墨相组成，包括许多缺陷，例如碳的悬挂键。当加热温度超过100 ℃时，薄膜的非晶结构逐渐转变为石墨相，这表明悬挂键密度增加。2.通过在几种大气中进行的摩擦实验，揭示了超低摩擦的表面吸附条件。结果表明：（1）对于氢气、水和氮气的气体吸附密度状态，摩擦系数都很低，特别是在氢气气氛中，摩擦系数小于0.01。但研究证明，在摩擦作用下，氧气促进了碳膜的界面结合。(2)It阐明了空气中的边界润滑受水吸附的影响很大。在目前往复摩擦实验条件下，低摩擦下的低吸水性是在脱附速率和吸附速率的适当平衡下实现的，脱附速率受摩擦条件的控制，吸附速率受气氛条件和膜层质量如石墨含量和表面自由基含量的控制。