摘要
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。
A novel cored wire for producing Fe 3Al intermetallic coating by arc spraying was developed.High velocity arc spray technology was successfully applied to prepare the Fe 3Al coating.The coating composition,microstructure and phases were investigated by energy dispersive X ray analysis (EDXA),X ray diffraction(XRD),scanning electron microscope(SEM)and image analyzer.Results show that the cored wire arc sprayed iron aluminide coating consists of major phases of Fe 3Al(Fe 29Al)and some FeAl and the second phase of about 20%α Al 2O 3.As compared with water wall tube material of power station boiler,the oxidation kinetics and solid particles erosion corrosion behavior under different incidence angle of Fe 3Al coating were determined.Results indicate that the oxidation rate of Fe 3Al coating is about one third of that of 20G steel(AISI1018)after exposure at 650℃ after 20 hours.The erosion corrosion resistance at elevated temperature of Fe 3Al coating is higher than that of 20G steel.Under oblique impact condition,the relative erosion corrosion resistance of Fe 3Al is 3 36 times than that of 20G steel.It is found that the Fe 3Al coating exhibits typical erosion behavior of brittle materials at elevated temperature.The erosion corrosion mechanism of Fe 3Al coating under elevated temperature was discussed
出处
《金属热处理》
EI
CAS
CSCD
北大核心
2000年第7期24-27,共4页
Heat Treatment of Metals
基金
国家经贸委98重点技术创新项目!( 98BK 0 1 4 )
清华大学摩擦学国家重点实验室基金
关键词
Fe3Al涂层
粉芯丝材
高速电弧喷涂
冲蚀
氧化
Fe 3Al intermetallic coating
cored wire
high velocity arc spraying
erosion corrosion
oxidation
