Study On Tribological Properties Of Graphene And Graphene Oxide Nano Lubricating Oil Additives

Lubrication is an important measure to reduce wear,save energy,and improve industrial production efficiency and reliability.It is necessary to explore and develop environmentally friendly lubricant additives with better lubrication effects.Since the discovery of graphene,graphene has quickly become a hot research topic due to its excellent optical,electrical,thermal and mechanical properties.From the perspective of tribology,this paper studies the tribological properties of graphene as a lubricant additive,and eompares the tribological properties of graphene and its oxides in multiple directions to improve the system of carbon-based lubricant additives.The theoretical basis for the application of lubricating oil additives in engineering.The main content and results of this paper are as follows:(1)Characterizing the phase composition of graphene and graphene oxide using an X-ray diffractometer and comparing it with a standard color chart.The particle size of the graphene and graphene oxide nanoparticles used in the experiment was characterized by a nano-laser particle size analyzer to ensure that the nanoparticles used in the experiment met the requirements.(2)Exploring the modification effect of octadecylamine and oleic acid on graphene and graphene oxide at different ratios with powder,and conducting multiple experiments on different proportions of samples.The projectile ratio and absorbance were measured by a visible light meter.It was found that when oleic acid modified graphene oxide and octadecylamine to graphene oxide,the ultrasonic modification time was 30 min,and the mass of the modifier was 60%of the mass of-the nano powder.It had the best effect.(3)To explore the graphene and graphene oxide as lubricant additives in tribological properties in high temperature conditions and anti-adhesion properties,four-ball friction and wear test machine,and adding the graphene graphene oxide were base oils friction and wear test.Respectively different mass fractions of base oil graphene and graphene oxide lubricant compared.The results showed that:adding graphene or graphene oxide can significantly improve the tribological properties of friction and anti-adhesion properties in a high temperature condition in the lubricating oil.When the graphene mass fraction of 0.03%,the friction coefficient decreased to about 22.5%,reduced wear scar diameter of about 48.9%.the anti-sticking time is increased to about 81.4%.When the graphene oxide mass fraction is 0.03%,the friction coefficient is reduced by about 37.5%,the wear spot diameter is reduced by about 50.1%,and the anti-adhesion time is increased by about 86.4%.Finally,three-dimensional confocal microscope against the surface of the ball tack test were observed and found added graphene or graphene oxide surfaee flatness better wear scar after laboratory mill base oil spots flatness.(4)Us:ing a reciprocating friction and wear test machine milling experimental results obtained experimentally verify the cylinder liner experimental samples observed under a metallurgical microscope and SEM used herein,the base oil salple was found to significantly badly worn,there are more plans mark.EDS spectrum scan results show,the C content of the graphene cylinder liner significantly more than samples C eontent of the base oil samples.The results of scanning a sample alkenyl cylinder liner surface contains graphite oxide displays an O element,and presumably graphite oxide nanographene.The mechanism of anti-wear and anti-friction of olefins is that the nanoparticles enter the friction pair during the friction and wear process,and timely repair the scratches caused by the filling friction,and play an anti-wear and anti-friction effect.