The Study Of Preparation And Tribological Properties Of Nanometer Lubricating Oil Additive

As the improvement and development of vehicle engine and the mining equipment transmission system,higher and higher demands are proposed on the performance of the lubricating oil.Early,the adoption of mineral base oil in temperature resistance,lubricity,oxidation-resistance,etc has been difficult to meet the demand.It becomes priority to develop the aspect of temperature stability,extreme pressure and anti-wear property of lubricant oil.With the continuous development and application of nanotechnology,the nano-tribology field has been deep researched.Nanomaterial can improve the propertied of oil heat resistance,improve the load capacity,and also reduce the effect of friction and wear.The repair film can be formed to reduce the shear effect,possess a good anti-friction lubrication performance,which has injected new vitality to the development of lubricating oil.Nanomaterials as lubricant additive particularly suited to strict lubrication occasions.By reducing the wear,improve the lubrication performance,will largely prolong the service life of the machine.From another level,also saves money and energy,no doubt is a very good research direction in this era of energy tension.This paper prepared the cuprous oxide?Cu₂O?,reduced graphene oxide?RGO?,silver?Ag?,Graphene-silver?RGO-Ag?compound.These nanoparticles as lubricating oil additive can not only lubricate on the wear surface,but also have the good "self-healing" function.Firstly,the Cu2 O nanoparticles coated by stearic acid was prepared by chemical liquid phase reduction method.The crystal structure,morphology and surface functional groups were characterized by XRD,TEM,FT-IR.The nanoparticles as lubricant oil additive were dispersed in the liquid paraffin evenly.Secondly,the graphene-silver nano-composite was prepared by liquid phase reduction method.The graphene oxide were ultrasonic dispersion,and then be adsorbed by silver ions with positively.The glucose was used as reducing agent under the condition of high temperature.The silver nanoparticles were prepared by using the method of Tollen reaction.The RGO were prepared by using the ascorbic acid as reducing agent.And the nanoparticles were modified with oleic acid,then as lubricant oil additive were dispersed in the liquid paraffin evenly.Finally,the tribology performance of lubricant oil contain nanoparticles were test.The MRS-10 G four-ball machine was used to test the lubricating and anti-wear performance.The MRS – 10 P four-ball machine was used to test the extreme pressure performance of the lubricating oil additive.The tribology performance was investigated under different load,speed and other experiments factors.The morphology of worn surface was acquired by using the optical microscope photograph and scanning electron microscope.The element of worn surface were analyzed by using the energy disperse spectrometer.The detail compounds of worn surface were analyzed by using the x-ray photoelectron spectrometer.Through the experiment research shows that:?1?The Cu₂O?RGO?Ag?RGO-Ag nanoparticles of were prepared by chemical reduction successfully.The detail analyzed by using the modern advanced testing means such as XRD,TEM.?2?The tribology test results show that RGO and Ag nanoparticles as lubricate oil additive exhibit good anti-friction and anti-wear performance respectively.While Cu₂O?RGO-Ag nanoparticles as lubricate oil additive exhibit excellent performance.?3?The lubricated mechanism of nanoparticles as lubricating oil additives was analyzed.And the detail analyzed of worn surface by using the modern advanced testing means such as SEM,XPS.The Cu₂O and Ag nanoparticles as inorganic nano-powder can repair the worn surface to reduce the abrasion.RGO-Ag compounds due to the presence of graphene itself “self-lubricating” effect and “self-repairing” of function of silver.Synergistic effect of compounds exhibit the more excellent tribological performance.