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采用超音速火焰喷涂技术在结晶器铜板表面制备了高硬度、高耐磨性的Ni60A涂层,研究了真空退火对喷涂层显微组织、显微硬度及高温磨损性能的影响。采用金相显微镜、场发射扫描电镜和X衍射仪分析了喷涂层的显微组织、磨痕形貌和相结构,利用显微硬度计和销盘高温磨损仪检测了喷涂层的硬度和高温耐磨性。结果表明:喷涂层主相为固溶体相γ-(Ni,Fe),此外还有Cr23C6和NixSi相;真空退火后喷涂层显微硬度减小,但涂层组织变得更加致密,涂层500℃高温摩擦系数明显降低,磨损机理均为较轻的黏着磨损。
The effect of vacuum annealing on the microstructure, microhardness and high temperature wear resistance of sprayed coatings was studied by supersonic flame spraying on the surface of mold copper. The microstructure, wear scar morphology and phase structure of the sprayed coating were analyzed by metallographic microscope, field emission scanning electron microscopy and X-ray diffraction. The hardness and high temperature resistance of the sprayed coating were measured by micro-hardness tester and pin-plate high temperature wear tester Grindability. The results show that the main phase of the sprayed coating is γ- (Ni, Fe) solid solution phase, in addition to the Cr23C6 and NixSi phases. The microhardness of the sprayed coating decreases after vacuum annealing, but the microstructure of the coating becomes more compact. High temperature coefficient of friction was significantly reduced, the wear mechanism are lighter adhesive wear.