▎ 摘　　要

To improve wear resistance of the titanium alloy micro-arc oxidation (MAO) coatings, this work explores the influence mechanism of graphene on the wear resistance. Wear-resistant ceramic coatings with different graphene concentrations were prepared on TC4 alloy by using the pulsed bipolar power supply. The surface properties and phase characteristics of the ceramic coating were measured and analyzed. The tribometer, scanning electron microscope and three-dimensional microscope (white light interferometer) were used to analyze tribological properties and surface topography of the samples, respectively. It was found that the friction coefficient of the material got significantly decreased by the MAO coatings, and the wear resistance was improved. Lubricating effect of the graphene did not influence the hardness and compactness of the coating directly, but film wear loss decreased during the friction process. Compared with the matrix, grinding cracks were more flat, lighter and narrower on the coatings. There were only tiny quantities of grinding wear marks on the coatings, and no obvious furrow or massive shedding was found.