Study On The Influence Of Doping And Interface Control On The Super Lubrication Behavior Of Hydrogenated Carbon Films

With the increasing requirements of high precision,long life and safe service of mechanical devices,friction and wear of motion pairs become one of the bottlenecks restricting its development.In order to solve these problems,more and more thin film materials have been developed and studied.Among them,diamond-like carbon(DLC)film has been widely concerned in recent years because of its low friction,high hardness,corrosion resistance and other properties,especially its advantages in super lubrication.In this paper,the influence of the intrinsic structure of the hydrogenated carbon films on the tribology is studied,and a new idea of interface induced super sliding is proposed.The main achievements are as follows:(1)the effects of nitrogen doping and silicon doping on the behavior of hydrogenated carbon films are compared,and it is pointed out that the introduction of N is easy to react with the contact surface of steel ball in the atmospheric environment,forming nano particles such as iron carbide and iron oxide,further accelerating wear and leading to high friction coefficient;while the introduction of Si element,inhibiting the damage of humidity on carbon films,promoting The formation of ordered carbon structure at the friction interface is the main reason for its super sliding.(2)For the problem that the amorphous carbon films with hydrogen can not achieve super sliding in the atmosphere,a new idea is proposed to induce the ordering of the nanostructure at the friction interface.The Au plated steel ball is used as the friction pair to induce the formation of ordered carbon nanostructure at the interface under the action of friction shear force,which realizes the super sliding at the macro scale.(3)Furthermore,the friction coefficient is as low as 0.003 by using molybdenum disulfide steel ball and amorphous carbon film.The microstructure study shows that the disordered molybdenum disulfide lamellar segments are arranged orderly and grow up under the action of friction,which is the main factor to achieve super sliding.