Study On The Onion-Like Fullerenes Nano Particles As Additive In Lubricating Oil

Friction and wear widely exist in nature. It consumes a lot of energysources and resource. It was said that 1/3 of world energy sources finallyconsume in various friction. All of the world friction wear loss exceed100 billion dollars per year. Specially nano carbon materials as lubricantadditive represent excellent properties because of its small scale, lightweight and good spread around and stability in oil. In this materials OFLstake on excellent self-lubricant properties because its high intensity andtoughness and unique hexagon structure which is similar to graphite.nano and onion materials can easily decompound because they have weakinterbedded force. It can form graphite coat which is resemble to microaxletree instead of cracking oil film in friction surface.So it acts aslubricant. Because of that application of nano OFLs self-lubricantproperties have good foreground.The fullerenes used as nano-additive in lubricating oil have beensynthesized with catalylitic decomposion method under heat energy. Thesurface of the nanoparticles were modified by using the stearic acid andthen were put into the base lubricant HVI 400 to spread around equablyby ultrasonic. The composition and microstructure of the nanoparticles,the lubricants friction testing and wear to investigate the Onion-like Fullerenes were characterized by the analysis methods of infrared RaySpectrum (IR) and Transmission Electron Microscope (TEM). Wearresistance of Onion-like Fullerenes under high temperature was studiedby the lubricant SRV Friction and Wear Testing and the relevant frictionmechanism was discussed. Utilize Scanning Electron Microscope (SEM)to observe and analyse the morphologies of the worn steel surfaces.Thesmallest friction coefficient was attributed to the thermal chemicalreaction among the OFLs, which led to the formation of a reaction filmwith good lubricity on the rubbing surface. The present method to preparethe organic liquid containing nano-carbon particles could be applied tothe mass production of lubricating oils doped with carbon nanoparticles.(1) After being purified with the mixture of sulfuric acid and nit ricacid , the Onion-like Fullerenes Nanoparticles-OFLs were modifiedwith stearic acid . The OFLs were characterized with the transmissionelect ron microscope ( TEM) and inf rared spect roscopy. The inf raredspect roscopy experiment s proved that the surfaces of OFLs could becoated by stearic acid. The dispersion of modified CNTs in base oil wasimproved significantly.(2) The modified OFLs can reduce the friction properties pf base oil.Under low load,the base oil with modified OFLs can much more reducethe friction coefficient than unmodified OFLs.and also can elong the dieout period .But the unmodified OFLs increase the the friction coefficient.So we must modify the OFLs to add in base oil ,and improvethe friction and wear behavior,(3) This experiment finds best experiment condition and study effect ofexperiment temperature and load on friction properties. We findtemperature have great effect on friction coefficient of oil. In experimentstage friction coefficient is big when temperature is low. And then frictioncoefficient decrease gradually with increase of temperature. It has leastvalue in round flash point of oil. Friction coefficient will take on linearityincreasing with increase of temperature. And load also has great effect onfriction coefficient of oil. In experiment stage friction coefficient is bigwhen load is low and temperature is fixed. And then friction coefficientdecrease gradually with increase of load. It has least value in 350N. Wefind 150℃and 350N are best experiment temperature and load.(4) In best experiment condition content of additive OFLs have greateffect on friction coefficient of oil. Lubricate properties of oil addingOFLs have great improve. Friction coefficient decreased with increase ofOFLs. The friction coefficient of oil is 0．22 when adding 0．01% OFLs. Itdecrease 24% than oil not adding OFLs. And then friction coefficientdecrease gradually with increase of content of OFLs. It has least value0．19 in adding 0．15% OFLs. It decrease 40% than oil not adding OFLsand its properties is best. So friction coefficient have minimum in adding0．15% OFLs and its friction properties is best. But friction coefficient gradually increase when OFLs exceed 0．20%. This indicate graphitelubricant film will be hold back. It leads to increase of friction coefficient.So friction coefficient have minimum in adding 0．15% OFLs and itsfriction properties is best.(5) In best experiment condition content of additive OFLs have greateffect on wear degree of oil. Lubricate properties of oil adding OFLs havegreat improve. Wear degree decreased with increase of OFLs. It has leastvalue in adding 0．15% OFLs. It decrease 40% wear degree and 42% weararea and 75% wear deepness and 15% wear width than oil not addingOFLs.(6) The base oil without OFLs,its morphologies of the worn steelsurfaces is scrape and adhesion,and the base oil with OFLs,itsmorphologies of the worn steel surfaces is much more smooth .Amongthe oil with modified OFLs nanoparticles with different contents,whenOFLs content is 0．15%,the morphologies of the worn steel surfaces ismost smooth.(7) The mechanism of Onion-like Fullerenes Nanoparticles (OFLs) isunder high temperature ,the nano particles can fill in the sunken whichlead by friction and wear.The Onion-like Fullerenes Nanoparticles canform a graphite flim ,the flim can protect and lubricate the wron steelsurface,and improve the friction and wear properties to enlong the wearperiod.