高速电弧喷涂 Fe 基涂层的耐磨性能研究

本文通过高速电弧喷涂技术在低碳钢基体上制备Fe基涂层， 采用光学显微镜(OM)、 扫描电子显微镜(SEM)、 白光干涉仪表征涂层的微观结构以及磨痕形貌， 通过维氏硬度计、 摩擦磨损试验机检测涂层的机械性能。 研究结 果显示涂层呈典型的片层状结构， 涂层较为致密， 孔隙率为 1.75±0.22%。 硬质相元素的添加提高了涂层的微观 硬度， 涂层的硬度大约是基体的四倍。 同时， 涂层的磨损量相对基体来说降低了 78.61%， 对磨球切削基体表面 形成较深的犁沟， 而涂层因硬度较大， 形成的沟槽较浅， 并且涂层表层出现脆裂、 剥落现象， 产生大量的磨粒， 使得基体与涂层的磨损机制由粘着磨损向磨料磨损转变

Study on Wear Resistance Property of Fe-based Coating by High Velocity Arc Spraying

In this paper, Fe-based coatings were prepared on low-carbon steel substrates by high-velocity arc spraying technology. Optical microscope (OM), scanning electron microscope (SEM) and white light interferometer were used to characterize the microstructure and wear morphology of the coating, and the mechanical properties of the coating were tested by Vickers and friction-abrasion testing machine. The results showed that the coating had a typical lamellar structure, the coating was relatively dense, and the porosity was 1.75± 0.22%. The addition of hard particles improved the microhardness of the coating, and the hardness of the coating was about four times that of the substrate. Meanwhile, the wear loss of the coating was reduced by 78.61% compared to that of the substrate, which forms a deeper furrow for the grinding ball to cut the substrate surface, and the coating was relatively hard, and the groove formed was shallower. The surface layer of the coating appeared brittle cracking and spalling phenomenon, and a large number of abrasive particles were produced, which makes the wear mechanism of the substrate and the coating changed from adhesive wear to abrasive wear.