Study On The Friction And Wear Mechanism Of Nanocopper As Lubricant Additives

The tribological behaviors of Cu-DDP as additive in lubricating oil were evaluated on a four-ball machine,and stock-on -ring testing machine was used to study the self-repairing performance of modified Cu nano- particles as additive in lubricating oil. The test results showed that the modified Cu nano-particles exhibited excellent anti-wear and friction reducing properties,as well as good self-repairing performance. The lubricating mechanism of Cu nanoparticles was discussed based on the XPS and SEM analytical results.Effects of different concentration of nano-Cu lubrication additives on contact fatigue properties of GCr15 stell friction pairs were evaluated on a ball- rod contact fatigue tester.The anti-fatigue mechanisms of these additives were analyzed by means of scanning electron microscopy(SEM) and X- ray photo electron spectroscopy(XPS).The test results and analyses show that all of these additives can raise the contact fatigue life of steel ball element to a certain extent.The action of 10%additive is the better.It is confirmed that main failure of steel ball element is fatigue desquamation.Anti-fatigue mechanism of lubrication additives mainly accounts for forming chemical reaction film on steel rod and ball surface and decreasing in friction between ball and rod,increasing the ability of anti-wear.