Microstructure and Mechanical Properties of Ni5Al/Al2O3-3%TiO2 Composite Structural Coating by Atmospheric Plasma Spraying
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摘要: 采用大气等离子喷涂（APS）技术在6061铝合金基体表面预制Ni5Al合金黏结层，再在黏结层上喷涂Al2O3-3% TiO2陶瓷层，研究了涂层的物相组成、微观形貌、显微硬度、结合强度、耐磨性能和耐腐蚀性能，分析了其拉伸断裂机理。结果表明：陶瓷层的物相主要由α-Al2O3、γ-Al2O3和锐钛矿型TiO2组成；黏结层与基体以及黏结层与陶瓷层均形成了机械结合，但黏结层与基体的结合界面更致密；与基体相比，涂层的显微硬度更高、耐腐蚀性能和耐磨性能更优；涂层的结合强度低于黏结层的，其拉伸断裂位置多在黏结层和陶瓷层之间的界面处以及陶瓷层内部，界面处的拉伸断裂形式为混合断裂，黏结层上的为韧性断口，陶瓷层上的为脆性断口。Abstract: Ni5Al alloy adhesive coating was pre-prepared on the surface of 6061 aluminum alloy substrate, and then Al2O3-3%TiO2 ceramic coating was prepared on the adhesive coating by atmospheric plasma spraying (APS) technique. The phase composition, micromorphology, microhardness, bonding strength, wear resistance and corrosion resistance of the coating were studied, and the tensile fracture mechanism was analyzed. The results show that the phases in the creamic coating mainly consisted of α-Al2O3, γ-Al2O3 and anatase TiO2. Mechanical bonding was formed between adhesive coating and substrate, and between adhesive coating and ceramic coating, but the bonding interface between the adhesive coating and substrate was more dense. Compared with the substrate, the coating had higher microhardness, better corrosion resistance and better wear resistance. The bonding strength of the coating was lower than that of the adhesive coating. The tensile fracture mostly occured at interfaces between the adhesive coating and ceramic coating, and also in the ceramic coating. The tensile fracture mode at the interface was mixed fracture; the adhesive coating had a ductile fracture, and the ceramic coating had a brittle fracture.
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