▎ 摘　　要

NOVELTY - Preparing wear-resistant self-lubricating coating on crane pulley wheel groove, comprises (i) placing dichromium trioxide powder and graphene powder in a ball mill, and sintering under vacuum to obtain chromium carbide powder; (ii) mixing the graphene powder and absolute ethanol uniformly; (iii) adding the chromium precursor into the graphene dispersion, stirring, suction filtering the precipitate, and drying the precipitate to obtain a dry powder; (iv) sintering the dry powder under vacuum conditions; (v) mixing the chromium carbide powder and the modified graphene powder with nano chromium carbide particles attached to the surface to obtain a mixed spray powder, placing the mixed spray powder in a ball mill, and using anhydrous ethanol and silicon carbide grinding balls as medium, and sieving to obtain chromium carbide/modified graphene mixed spray powder; and (vi) carrying out surface derusting, descaling and degreasing cleaning treatment on the surface of crane pulley wheel groove. USE - The method is useful for preparing wear-resistant self-lubricating coating on crane pulley wheel groove. ADVANTAGE - The coating has excellent wear resistance and self-lubricating properties, can well protect the pulley groove of the crane in the environment where it is worn with the wire rope. The good microstructure of the chromium carbide/modified graphene gradient coating is conducive to the performance of the coating and can effectively extend the service life of crane pulleys. DETAILED DESCRIPTION - Preparing wear-resistant self-lubricating coating on crane pulley wheel groove, comprises (i) placing dichromium trioxide powder and graphene powder in a ball mill, and using anhydrous ethanol and silicon carbide grinding balls as the medium for ball milling for 8-12 hours, drying the ball-milled material and sintering under vacuum to obtain chromium carbide powder; (ii) mixing the graphene powder and absolute ethanol uniformly, adding deionized water to mix and ultrasonically dispersing to obtain a graphene dispersion; (iii) adding the chromium precursor into the graphene dispersion, stirring, suction filtering the precipitate, and drying the precipitate to obtain a dry powder; (iv) sintering the dry powder under vacuum conditions to obtain modified graphene powder with nano chromium carbide particles attached to the surface; (v) mixing the chromium carbide powder and the modified graphene powder with nano chromium carbide particles attached to the surface to obtain a mixed spray powder, placing the mixed spray powder in a ball mill, and using anhydrous ethanol and silicon carbide grinding balls as the medium, and ball milling for 6-10 hours, ultrasonically dispersing the material, drying and sieving to obtain chromium carbide/modified graphene mixed spray powder, where the mass percentage of chromium carbide in the chromium carbide/modified graphene mixed spray powder is 20-40% and the balance is modified graphene powder with nano chromium carbide particles attached to the surface; and (vi) carrying out surface derusting, descaling and degreasing cleaning treatment on the surface of crane pulley wheel groove, and using the chromium carbide/modified graphene mixed spray powder to explode spray the surface of the processed crane pulley wheel groove according to the coating gradient requirements.