▎ 摘　　要

NOVELTY - Preparing surface functional gradient friction layer of titanium alloy comprises controlling the surface roughness of the titanium alloy to 0.1-0.4 mu m, preparing the multilayer graphene having a layer number of 20-50 layers by liquid phase stripping method using expanded graphite as a raw material, preparing nanometer ferric oxide particles having a particle size of 30-300 nm, spherical or spindle-shaped, forming the multilayer graphene and the ferric oxide nanoparticles into a composite material by a liquid phase stripping method at a certain ratio in the atmosphere and room temperature environment, or after mechanical mixing, directly adding to the sliding interface, and shaking to perform dry sliding friction, where the sliding speed is 0.5-1.5 m/second, the load is 20-100 N, the sliding distance is 200-1200 m, the total amount of nano material added is 0.2-0.4 mg/mm2, and the weight ratio of the multilayer graphene and the ferric oxide nanoparticles is 1:2,1:1 or 2:1. USE - The method is useful for preparing surface functional gradient friction layer of titanium alloy. ADVANTAGE - The method: utilizes the nano material with antifriction and anti-wear function on the sliding interface; and artificially induces the functional gradient friction layer on the surface of the titanium alloy under the condition of normal conditions and without consuming the substrate.