▎ 摘　　要

NOVELTY - Preparing a wear-resistant self-lubricating gradient coating on a crane wheel involves drying the molybdenum trioxide powder to obtain dry powder. The dry powder is placed in a sintering furnace, and continuously injected a mixed gas of carbon monoxide and argon into the sintering furnace for sintering to obtain molybdenum carbide powder. The graphene powder and absolute ethanol are mixed uniformly, added deionized water, mixed and ultrasonically dispersed to obtain a graphene dispersion. The precursor of molybdenum is added to the graphene dispersion, and stirred. The precipitate is suction filtered, and the precipitate after suction filtration is dried to obtain a dry powder. The dry powder is sintered in an argon atmosphere, and obtained a modified graphene powder with nano-molybdenum carbide particles attached to the surface. USE - Method for preparing a wear-resistant self-lubricating gradient coating on a crane wheel. ADVANTAGE - The method has extremely has high wear resistance and self-lubricating properties, meets the requirements of crane wheel rim working environment, and has good application prospects in this field. DETAILED DESCRIPTION - Preparing a wear-resistant self-lubricating gradient coating on a crane wheel involves drying the molybdenum trioxide powder to obtain dry powder. The dry powder is placed in a sintering furnace, and continuously injected a mixed gas of carbon monoxide and argon into the sintering furnace for sintering to obtain molybdenum carbide powder. The graphene powder and absolute ethanol are mixed uniformly, added deionized water, mixed and ultrasonically dispersed to obtain a graphene dispersion. The precursor of molybdenum is added to the graphene dispersion, and stirred. The precipitate is suction filtered, and the precipitate after suction filtration is dried to obtain a dry powder. The dry powder is sintered in an argon atmosphere, and obtained a modified graphene powder with nano-molybdenum carbide particles attached to the surface. The molybdenum carbide powder is mixed with the modified graphene powder with nano-molybdenum carbide particles attached to the surface to obtain a mixed spray powder. The mixed spray powder is placed in absolute ethanol, stirred uniformly, added deionized water, and ultrasonically dispersed to obtain a mixed dispersion. The mixed dispersion is stirred under a paddle stirrer to dryness. The mixed dispersion is kept at a constant temperature of 60-80 degrees C during the stirring process, dried the material, and sieved. The molybdenum carbide/modified graphene mixed spray powder is obtained. The mass percentage of molybdenum carbide in the molybdenum carbide/modified graphene mixed spray powder is 20-80%. The balance is modified graphene powder with nano-molybdenum carbide particles. The surface derusting, descaling and degreasing treatments are performed on the outer edge surface of the crane wheel. The molybdenum carbide/modified graphene mixed spray powder is used to perform supersonic flame spraying on the surface of the outer edge of the crane wheel after treatment according to the requirements of the coating gradient. A wear-resistant self-lubricating gradient coating of the crane wheel is obtained on the outer edge surface of the crane wheel.