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为了改善涂层的组织和性能,对超音速等离子喷涂技术制备的高铝青铜涂层进行高频感应重熔处理,研究重熔后涂层的微观组织结构特征和界面结合状态.感应重熔前涂层具有层流状组织特点,含有少量氧化渣、孔隙及未完全熔融颗粒,涂层与基体间以机械结合为主.感应重熔能消除未熔颗粒和夹杂,使组织致密、均匀,组织的层流特征弱化,孔隙率有所下降.基体元素和涂层元素相互扩散,在界面形成一条明显的白亮带,呈冶金结合状态,结合牢固,涂层的结合性能有所改善.重熔后扩散带和涂层表面的硬度较高,界面结合强度也由重熔前的25.110提升至83.358 MPa.
In order to improve the microstructure and properties of the coatings, high-frequency induction remelting of high-aluminum bronze coatings prepared by supersonic plasma spray technology was carried out to study the microstructure and interfacial bonding of the remelted coatings. The coating has the characteristics of laminar flow, with a small amount of oxidized slag, pores and incompletely melted particles, and the mechanical bonding between the coating and the substrate is the main method. Induction remelting can eliminate unmelted particles and inclusions, make the tissue dense and uniform Of the laminar flow characteristics weaken the porosity decreased.The matrix elements and coating elements interdiffusion, forming a clear white band at the interface, was metallurgical bonding state, combined with a solid, the coating bonding performance has improved after remelting Diffusion belt and the coating surface hardness is higher, the interfacial bonding strength also increased from 25.110 before remelting to 83.358 MPa.