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首页> 外文期刊>Coatings >Microstructure, Mechanical Properties and Wear Behavior of High-Velocity Oxygen-Fuel (HVOF) Sprayed (Cr3C2-NiCr+Al) Composite Coating on Ductile Cast Iron
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Microstructure, Mechanical Properties and Wear Behavior of High-Velocity Oxygen-Fuel (HVOF) Sprayed (Cr3C2-NiCr+Al) Composite Coating on Ductile Cast Iron

机译：高速氧气 - 燃料（HVOF）喷涂（CR3C2-NICR + Al）复合涂层在延性铸铁中的微观结构，力学性能和磨损行为

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In the present work Cr3C2-NiCr powder containing Al particles was deposited on ductile cast iron with high-velocity oxy-fuel (HVOF) thermal spray coating technique. An investigation was conducted to determine the role of Al particles in the Cr3C2-NiCr coating produced with HVOF technique on microstructure, mechanical and wear properties in a system Cr2C3-NiCr coating/ductile cast iron. The microstructure of the HVOF-sprayed Cr3C2-NiCr+Al coating was characterized by light microscopy, X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM) and energy dispersive X-ray spectroscopy (EDS). Microstructure analysis reveals the formation of coating with low porosity, good adhesion to the substrate and dense structure with irregularly shaped particles of Al arranged in strips and finely fragmented Cr3C2 particles embedded in a nanocrystalline Ni-Cr alloy matrix. In addition, the results were discussed in reference to examination of bending strength considering cracking and delamination in the system of (Cr3C2-NiCr+Al)/ductile cast iron as well as microhardness and wear resistance of the coating. It was found that the addition of Al particles significantly increased resistance to cracking and wear behaviour in the studied system.
机译：在本作品中，含有Al颗粒的CR3C2-NiCR粉末沉积在具有高速氧 - 燃料（HVOF）热喷涂技术的延性铸铁上。进行了研究以确定Al颗粒在用HVOF技术的CR3C2-NiCR涂层中的作用，在系统CR2C3-NICR涂层/球墨铸铁中的微观结构，机械和磨损性能下生产的。通过光学显微镜，X射线衍射（XRD），扫描电子显微镜（SEM），透射电子显微镜（TEM）和能量分散X射线光谱（EDS）表征HVOF喷涂CR3C2-NICR + Al涂层的微观结构。 。微观结构分析显示，涂层的形成具有低孔隙率，与基材的良好粘附性和致密的结构，具有不规则形状的Al颗粒，其布置在条带中，并嵌入纳米晶体Ni-Cr合金基质中的细碎的CR3C2颗粒。此外，考虑到（CR3C2-NICR + Al）/延性铸铁系统中的裂缝和分层以及涂层的微硬度和耐磨性，参考弯曲强度的检查，讨论了结果。发现Al颗粒的添加显着增加了研究系统中的抗裂性和磨损行为的抗性。

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