Self-Repairing Mechanism and Tribological Properties of Nano-Cu as Lubricating Oil Additives
Cu nanoparticles coated with dialkyldithiophosphate were synthesized by chemical reduction in solution.The effects of the content of nano-Cu additives in base lubricating oil on the friction coefficient and wear scar diameters were investigated by four-ball machine under different loads.Moreover,scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS) were used to study the wear scar images and elemental composition,and the hardness and elasticity modulus of the Cu film were tested by nano-indentation.Results showed that when the content of nano-Cu was 0.4％(mass fraction),the optimal anti-wear performance was obtained,and the friction coefficient and wear scar diameter were lower by 23.0％-27.2 ％ and 15.1％-24.9 ％ than those without nano-Cu additives,respectively.Furthermore,during friction process,the Cu nanoparticles were deposited on the frictional surface to form deposited film with hardness of 1.63 GPa and elasticity modulus of 78.08 GPa,which resulted in the excellent anti-wear and anti-friction performance.
nano-Cu additiveslubricating oilanti-wear and anti-friction performanceself-repairing property
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NSTL
万方数据
维普
