电弧喷涂FeBC涂层的微观结构与磨粒磨损性能

Microstructure and abrasive wear behavior of FeBC coating prepared by wire-arc spraying

摘要: 采用电弧喷涂技术制备了不同硼、碳元素含量的FeBC系涂层。采用光学显微镜、X射线衍射(XRD)、扫描电镜(SEM)等方法分析了涂层的微观组织及相结构，并对涂层的显微硬度和磨粒磨损性能进行了测试。结果表明, 制备的FeBC涂层中氧含量较低，含有微小裂纹和未熔颗粒，随着B，C含量的增加，涂层中未熔颗粒增多，所形成的Fe₂B，Fe₂₃(C, B)₆硬质相可显著提高涂层硬度和耐磨性，试验中添加质量分数为8%的B和0.4%的C时涂层耐磨性能最好，随着B, C含量的继续增加，耐磨性降低。

Abstract: FeBC coating with different boron and carbon contents were prepared by wire-arc spraying. The effect of B and C contents on the microstructures and wear resistance of coatings were analyzed by optical microscope,X-ray diffraction(XRD),scanning electron microscopy(SEM),microhardness and abrasive wear testing machine. The results indicate that there are micro-cracks and unmelted particles in the as-deposited Fe-based coatings. With the increases of B and C contents,the unmelted particles increase,the Fe₂B,Fe₂₃(C,B)₆ hard phase can improve the hardness and wear resistance of the coating significantly. In this studies,the coating with 8% boron and 0. 4% carbon has the best wear resistance,and with the increases of B and C contents,the wear resistance decreases.