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Tribological Behavior of Nano-Cu Particles as Additive in 50CC Lubricating Oil

YU He-long,XU Yi,LIU Qian,SHI Pei-jing,XU Bin-shi (1. Department of Equipment Remanufacturing Engineering of Academy of Armored Force Engineering, Beijing 100072; 2. National Key Laboratory for Remanufacturing,Beijing 100072)  
The anti-wear and friction reducing performance of nano-Cu particles as lubricating oil additive was evaluated on ball on disc and ring on block testers. The worn surface morphology and composition of surface film were analyzed by means of scanning electron microscope (SEM) and energy dispersive spectroscope(EDS). The results indicated that there exists an optimal content of nano-Cu particles in oil, at witch the anti-wear and load-carrying capacities of the oil with nano-Cu particles are improved, and the friction coefficient and frictional heat are decreased. The mechanism can be explained by a boundary lubrication film composed of Cu, which has a low shearing strength, formed under the high temperature and pressure during the friction process.
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