粒度对超音速等离子喷涂高铝青铜合金微观结构的影响

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

采用超音速等离子喷涂技术在45号钢表面制备粒度范围为-280^+320目、-320^+360目、-360^+400目、-400目的4种高铝青铜合金粉体涂层。采用XRD、SEM等手段对涂层的物相组成、组织结构、显微硬度等进行了分析,研究了粒度对涂层组织及性能的影响。结果表明,粉体的粒度对涂层显微组织结构及性能有着重要影响。粉体粒度越细小,涂层的组织及性能越优良。-400目的粉体制备的涂层组织致密均匀,层流状结构明显,显微硬度可达367.5HV。

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-＋320meshes, -320-＋360meshes, -360 ＋400meshes 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 367.5HV.