Method for renovating lubricant pump casing bush with plasma spraying Cu-Al coating

A method for repairing a lubricant pump shell bushing by plasma sprayed Cu-Al coating belongs to the technical field of aviation. The repairing of a narrow-arc convex end face of the lubricant pump shell bushing by a plasma spraying method comprises the steps of washing, grit blasting, protection, spraying the spray material on the narrow-arc convex end face of the lubricant pump shell bushing by plasma spraying equipment. By adopting the method for repairing the lubricant pump shell bushing by plasma sprayed Cu-Al coating, the sprayed coating has as high as 41.07MPa of bonding strength and relatively stable hardness value. Bending test result shows that the coating bond is relatively good, and coating microscopic test shows that the metallurgical structure is relatively compact. The method has the advantages of reasonable process and correct preferences, which achieves the effect of repairing the lubricant pump shell bushing and has significance in prolonging the service life of the lubricant pump shell bush