PEEK coatings have been applied to sliding bearings in marine machinery and equipment, but their low bonding force, poor thermal conductivity and weak oleophilicity result in insufficient anti-adhesive wear performance. To solve this problem, the textured surface of the substrate was fabricated using laser texturing technology to enhance the bonding force. The PEEK coatings were reinforced by introducing oleophilic-modified nano-SiO2 and graphene. The tribological properties of the PEEK composite coatings were studied using the ball–disc reciprocating friction wear test and Abaqus wear simulation. The results show that the texturing treatment of the substrate surface improves the bonding force of the coating. The addition of nano-SiO2 and graphene enhances the hardness, thermal conductivity and oleophilicity of the composite coating, which shifts the wear mechanism from adhesive to abrasive. Under dry friction conditions, the composite coating containing 5 wt% SiO2 and 1 wt% graphene exhibits a low friction coefficient and the lowest wear rate. Under oil lubrication conditions, the composite coating containing 2 wt% graphene shows the lowest friction coefficient and wear rate. In summary, under the load-bearing capacity enhancement of nano-SiO2 and the thermal conductivity enhancement of graphene, the composite coating exhibits excellent anti-adhesive wear performance.
Wang et al. (Wed,) studied this question.