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采用自行研制的电弧喷涂Fe3Al合金粉芯丝材 ,成功地用高速电弧喷涂技术制备出了Fe3Al金属化合物涂层。运用能谱技术 (EDXA)、X射线衍射仪 (XRD)、扫描电子显微镜 (SEM)和图像分析仪对涂层成分、显微组织、涂层相结构和组成进行了分析。结果表明 ,涂层由以Fe 2 9Al为主的Fe3Al和少量FeAl基体相和约 2 0 %的α Al2 O3相组成。对比研究了Fe3Al涂层和电站锅炉水冷壁材料 2 0G的 650℃氧化动力学 ,以及 650℃氧化环境条件下不同冲击角度的高温冲蚀磨损性能。结果表明 ,Fe3Al涂层 2 0h氧化速率约为 2 0G的 1 /3;Fe3Al涂层的高温冲蚀磨损抗力高于 2 0G ,低角度下的相对冲蚀磨损抗力为 2 0G的 3 36倍。试验条件下Fe3Al涂层呈现典型的脆性材料冲蚀磨损行为。并对其高温冲蚀磨损机理进行了分析。
The Fe3Al metal compound coating was successfully prepared by high speed arc spraying using the self-developed arc spraying Fe3Al alloy cored wire. The composition, microstructure, phase structure and composition of coating were analyzed by EDXA, XRD, SEM and image analyzer. The results show that the coating consists of Fe 3 Al mainly composed of Fe 2 9 Al, a small amount of FeAl matrix phase and about 20% α Al 2 O 3 phase. The oxidation kinetics of Fe2O3 coating and 20G waterwall material for power plant boiler at 650 ℃ and the high temperature erosion wear behavior at different impact angles under 650 ℃ oxidative environment were compared. The results show that the oxidation rate of Fe3Al coating is about 1/3 of 20G at 20h. The high temperature erosion wear resistance of Fe3Al coating is higher than 20G, and the relative erosion wear resistance at low angle is 3 36 times of 20G. Fe3Al coating shows the typical wear behavior of brittle materials under the experimental conditions. The mechanism of high temperature erosion wear was analyzed.