超音速等离子-感应复合技术制备高铝铜合金涂层特性

摘要

为了探讨超音速等离子-感应重熔复合技术制备粗粉高铝铜合金材料涂层的能力以及所制备涂层的特点,采用超音速等喷涂预制涂层,采用高频感应加热对涂层重熔处理,研究了该复合技术制备涂层的微观组织结构特征和界面结合状态.结果发现:粗粉高铝铜合金粉体超音速等离子喷涂层氧化严重,尤其在界面处聚集了大量的氧化物,使涂层和基体不能实现有效结合,涂层中较多的氧化和孔隙,隔离了层流片的熔结,并且涂层成分偏析严重.经过感应重熔后的涂层组织细小均匀,大量的氧化物排出,涂层和基体实现了冶金结合,同时感应加热使涂层成分分布更加均匀.研究结果表明超音速等离子-感应重熔复合技术具有制备高铝铜合金粗粉涂层的能力,在涂层与基体界面处能够形成宽度为10～15μm的冶金结合带.%In order to investigate the coating preparation ability and the characteristics of the coating of the high-aluminium copper coarse powders prepared by supersonic plasma spraying and induction-refusion composite technology,the coating was prefabricated by supersonic plasma spraying,and the coating was remelted by a high frequency induction system.Furthermore,the microstructure characteristics and the combination state of the interface were investigated on the coating.The results show that the high-aluminium copper coarse powder coating prepared by supersonic plasma spraying is heavily oxidated.In particular,a good deal of oxide is focused on the interface,which makes the coating ineffectively bond with the substrate,and the abundant oxides and holes segregate laminar flow layer,blocking them from sintering.At the same time,the coating has significant element segregation.However,using the induction remelting technology,the coating has even smaller organization,a mass of oxide is expelled,and the coating bonds with substrate by means of metallurgy.Concurrently,induction-refusion homogenizes the coating elements.This investigation demonstrates that the supersonic plasma spraying and induction-refusion composite technology has the ability to prepare a high-aluminium copper alloy coating with coarse powders.A rnetallur-gical belt with a width of 10 to 15 μm is formed in the interface of the coating and the substrate.