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采用超音速火焰(HVOF)喷涂技术在06Cr13Ni4Mo不锈钢基体上分别制备了微米和纳米结构WC-10Co4Cr涂层。通过X射线衍射仪(XRD)和扫描电子显微镜(SEM)表征和分析了不同结构WC-10Co4Cr涂层的物相组成、微观组织结构,并对涂层的显微硬度、孔隙率、结合强度、抗冲蚀性能进行了对比,探讨了涂层泥沙冲蚀机理。结果表明:HVOF制备的纳米结构WC-10Co4Cr涂层组织致密,孔隙率更低,涂层的显微硬度、结合强度高于微米涂层,冲蚀质量损失量也小于微米涂层;纳米结构细化了涂层晶粒,增强了涂层的显微硬度和韧性,提高了涂层的抗微切削和抗疲劳剥落性能,有利于涂层的抗泥沙冲蚀性能。
The WC-10Co4Cr coatings with micron and nanostructures were prepared on 06Cr13Ni4Mo stainless steel substrate by HVOF spraying technology. The phase composition and microstructure of WC-10Co4Cr coatings with different structures were characterized and characterized by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The microhardness, porosity, bond strength, Erosion-resistant performance were compared to explore the mechanism of erosion of the coating sediment. The results show that the nano-structured WC-10Co4Cr coating prepared by HVOF has the advantages of compact structure and lower porosity. The microhardness and the bonding strength of the coating are higher than that of the micro-coating, and the erosion mass loss is also less than that of the micro-coating. The coated grains enhance the microhardness and toughness of the coating, improve the anti-micro cutting and anti-fatigue spalling properties of the coating, and are good for the anti-sediment erosion resistance of the coating.