▎ 摘　　要

NOVELTY - Yttria-stabilized zirconia/graphene composite sealing coating comprises a layer of coating with a thickness of not less than 0.1 mm prepared on a substrate with yttria-stabilized zirconia/graphene composite powder as a raw material, where the mass ratio of yttria-stabilized zirconia to graphene in the yttria-stabilized zirconia/graphene composite powder is (26-83):1. USE - Yttria-stabilized zirconia/graphene composite sealing coating. ADVANTAGE - The sealing coating improves overall toughness and wear resistance, enhances thermal stability, meets requirements of seal coating in high-temperature service environment, is fully melted and does not decomposed during spraying process, and high-density coating, is simple to operate, easy to control and cost-effective, and has high production efficiency. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is included for a method for preparing the sealing coating, involving (a) cleaning and roughening the surface of the substrate to be sprayed to make the roughness of 3-7 mu m, (b) preheating the substrate to control the temperature of the substrate at 100-200 degrees C, and (c) using plasma spraying process to spray the composite powder on the substrate with a main gas flow rate of 75-90 l/minute, an auxiliary gas flow rate of 30-45 l/minute, a carrier gas flow rate of 8 l/minute, a current of 800-900 A, a spraying distance of 80-85 mm, and a powder feeding rate of 4 rpm and using compressed air to cool the substrate during the spraying process to obtain the sealing coating on the substrate, where the main gas and carrier gas are argon gas, and the auxiliary gas is helium gas.