Abstract:In this paper, Fe3O4 based magnetic fluids with different particle concentrations were prepared by the co-precipitation technique. The size of the Fe3O4 nanoparticles is about 13 nm and their shape is spherical. The tribological performances of the fluids with different concentration Fe3O4 nanoparticles were evaluated in a MMW-1A four-ball machine. The results show that the tribological performance of magnetic fluids with proper Fe3O4 nanoparticles can be improved significantly. The maximum nonseized load (P B) has been increased by 38.4% compared with carrier liquid. The wear scar diameter has been reduced from 0.68 mm to 0.53 mm and the relative percentage in friction coefficient has decreased to 31.3%. The optimal concentration of the Fe3O4 nanoparticles in the carrier liquid is about 4 wt.%.

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