Study On The Friction Wear Property And Applied Of Submicron Cu In Base Oil

The thesis regards submicron Cu in base oil as the object of research,and using four-ball machine to analyze the influences on friction wear property of base oil by the factors,just like the different mass fraction of nano/submicron Cu,load and rotational speed.The wear scar surface appearance and elements under different condition were analyzed by scanning electron microscopy(SEM)and energy dispersive spectrometer(EDS),to explore the anti-wear and anti-friction effect and mechanism of nano/submicron Cu.Then base oil including submicron Cu were added in vehicle engine to do bench test and real vehicle road test,to explore the influence of engine performance,energy conservation and environmental protection by submicron Cu.(1)The results of fraction wear property tests showed that the anti-wear and anti-friction performance were the best when the mass fraction of nano/submicron Cu were 0.1%,the friction coefficient decreased by 25.7% and 23.8% respectively,the wear scar diameters decreased by 16.2% and 12.8% respectively.The anti-friction performance of submicron Cu was better than nano Cu when the mass fraction were 0.15%~0.6%.The anti-friction performance of nano/submicron Cu were obvious when the load were about 150~650N.The anti-wear effect of nano/submicron Cu rose along with the load increase,and the anti-wear effect of submicron Cu was better than nano Cu under the condition of high load.The anti-wear and anti-friction effect of nano/submicron Cu were rose with the rotational speed increase,and the anti-friction of submicron was better than nano Cu under the condition of low rotational speed.(2)The results of the wear scar surface microscopic analysis showed that the anti-wear and anti-friction of nano/submicron Cu as base oil additives were very obvious,and the reasons were those nano/submicron Cu had ‘ball’ performance and surface-polishing-optimization performance in the process of lubrication,but no self-repair performance.(3)The results of bench test showed that the engine torque increased by 1.27%,the output power increased by 1.2% and the fuel consumption reduced by 1.09% after adding base oil including submicron Cu to the engine.It had no adverse effect on secure and stable operation of the engine,and improved effectively the engine performance.(4)The results of real vehicle road test showed that NOX、THC+NOX and PM in diesel engine exhaust were reduced by 13.5%、12.5% and 4% respectively,fuel consumption reduced by 9.4% before and after use.CO、NOX and HC in gasoline engine exhaust were reduced by71.8%、3.5% and42.6% respectively,fuel consumption reduced by 6.8% before and after use.It improved vehicle engine power,reduced the vibration and noise,guaranteed the safe and stable operation of vehicle.