▎ 摘　　要

In this study, graphene oxide (GO) and Fe3O4 were bonded to prepare magnetized graphene oxide (MGO). The MGO was characterized by transmission electron microscope (TEM), Fourier transform infrared (FT-IR) spectroscopy, X-ray diffraction (XRD), and vibrating sample magnetometer (VSM). Research results showed that Fe3O4 nanoparticles were uniformly loaded onto the GO surface by chemical grafting, making MGO ferromagnetic. MGO/WPU nanocomposite coatings were prepared by adding different contents of MGO to WPU, and the tribological properties of coatings were tested in different magnetic field intensities (0 mT, 20 mT and 40 mT). Tests showed that the anti-friction and wear-resistance of the nanocomposite coatings were significantly improved by magnetic field. The 0.5 wt% MGO/WPU nanocomposite coating had the best tribological performance in a 40 mT magnetic field, with a friction coefficient of 0.094 and a wear rate of 0.24 x 10-4 mm(3)/(N.m). The formation of the stable transfer film is a dynamic equilibrium process, and the magnetic field promotes the formation of the transfer film and strengthens the adhesion of the transfer film. Additionally, a magnetic fieldnanocomposite coating energy system model was proposed.