The Friction And Wear Properties Of MoS₂/Carbon-based Films Prepared By Rubbing And Sketching

Friction and wear often results in energy loss and environmental pollution,how to reducing friction and wear will save a lot of limited energy,re duce pollutant emissions and extend the mechanical life effectively.Molybdenum disulfide（Mo S 2）,carbon materials（graphite,carbon nanotubes,etc.）usually used as a solid lubricating material due to their excellent anti-friction and wear resistance properties.In this paper,the MoS₂/carbon-based films were prepared by rubbing and sketching,then the tribological properties of different dual and load conditions were investigated on a Reciprocation tribo-tester（FMT-R4000）.Field emission scanning electro n microscopy（FE-SEM）and Raman spectroscopy were used to reveal the structure and its evolution of MoS₂/carbon-based films during the course of friction.Three-dimensional surface profiler（Micro XAM-3D）was used to characterize the surface topography of wear tracks.MoS₂ solid lubricating films were prepared on the surface of stainless steel by mechanical rubbing MoS₂ powder,and then we used GCr15,Al2O3 and Si3N4 ball as couple pairs to investigate the friction and wear properties of as-prepared MoS₂ films.The results show that the MoS₂ films have good anti-friction and wear resistance performance when three different dual applied.The friction coefficient of stainless steel was reduced by 82%（before coating ⁰.5 and after coating ⁰.09-0.1）,and the wear volume was reduced by 18%,35% when the load was 5 N and 10 N,in addition.Furthermore,the reduce of layers and oxidation of Mo S 2 films eventually leading to lubrication failure.Graphite films as solid lubrication were prepared on the surface of stai nless steel by pencil sketch.Next,we investigated the friction-wear properties and structural evolution during the friction process.The results show that the pencil sketch graphite films have excellent resistance to friction and abrasion.The friction coefficient of stainless steel was reduced by ⁸0-85%,significantly reduce the wear of the stainless steel surface（only the original 1/28）.In addition,the compactness and the lifespan of as-sketched graphite films could be improved by variable loads.Carbon nanotubes（CNTs）films were prepared directly on the surface of stainless steel by mechanical rubbing CNTs powder,hereafter we investigate the friction and wear properties of as-prepared films（the couple pairs were GCr15,Al2O3 and Si3N4 ball,the load was 5 N,10 N and 5-15 N）.The results show that for the stainless steel base,the CNTs films prepared by mechanical rubbing can play a good anti-friction and wear resistance effect（before coating the friction coefficient up to 0.5-0.6,there is a running-in period ⁷.5 min,whereas after coating the friction coefficient as low as ⁰.1,the wear is also significantly reduced）.Moreover,we explore the lubrication failure mechanism of the CNTs films,it is found that the damage of tubular CNTs caused by friction result in lubrication failure.