Preparation and Boundary Lubrication Performance of Fe3O4@CuO Magnetic Fluid
HE Yan1, WANG Youqiang1,2,*, MO Jun1, ZHAO Tao1, ZHU Yuling1, LI Mengjie1
1 School of Mechanical and Automotive Engineering, Qingdao University of Technology, Qingdao 266520, Shandong, China 2 Key Laboratory of Energy Conservation and Pollution Control of Industrial Fluids, Ministry of Education, Qingdao 266520, Shandong, China
Abstract: Nano Fe3O4 particles and nano Fe3O4@CuO particles were synthesized by chemical coprecipitation. The nanoparticles were characterized by field emission transmission electron microscopy (FETEM), X-ray diffraction (XRD), vibrating sample magnetometer (VSM) and fourier transform infrared spectrometer (FTIR). Polyalphaolefin (PAO) 3 magnetic fluids with different particle contents were prepared by surfactant method. The magnetic fluid was characterized by some changes of magnetic field and ultraviolet spectrophotometer. The friction and wear tester is UMT-3. The friction pairs are 12CrNi4A and Si3N4. The experimental results show that the addition of nano Fe3O4 increases the friction and wear. Compared with PAO3 oil, the friction coefficient of PAO3 based magnetic fluid lubricated with nano Fe3O4 and CuO composite nanoparticles is reduced by 29.6% and the wear scar width is reduced by 49.6%. From the analysis of wear mark surface, this is due to the friction sintering effect of CuO, and an effective friction film is formed on the friction surface to repair the wear surface.
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