Effect of powder size on coating microstructure of high-aluminum bronze by supersonic plasma spraying

Took 45 steel as the matrix, high aluminum bronze alloys coatings were prepared by S-APS with four different particle sizes powders, which were -280- +320 meshes, -320- +360 meshes, -360- +400 meshes and -400 meshes. The phase composition, microstructure, microhardness were analyzed by means of XRD and SEM. The results shows that the powder particle sizes have an important influence on the coating structure and performance. The smaller powder sizes are, the better the coatings structure and performance are. The coating prepared by the -400 meshes powders has dense and homogeneous organization, obvious laminar structure characteristic. The average hardness of the coating of -400 meshes powders reaches 367.5 HV.