(装甲兵工程学院 装备再制造技术国防科技重点实验室， 北京 100072)
摘 要: 采用粉芯丝材和高速电弧喷涂技术（HVAS）制备了Fe-Al金属间化合物涂层， 并研究了涂层的显微组织和室温至650℃的滑动摩擦磨损性能。 结果表明： Fe-Al涂层的平均成分为Fe-20.0Al-14.1O（摩尔分数， %）， 主要相是Fe3Al， FeAl， α-Fe， Al2O3及少量Al； 涂层具有较高的结合强度和硬度、较低的孔隙率及较高的高温耐磨性； 高温下磨损面形成了大面积的氧化物保护层， 降低了涂层的摩擦因数， 而剥层磨损是涂层的主要磨损机制。 涂层中Fe3Al和FeAl金属间化合物相较高的高温强度和硬度能有效地阻碍裂纹的产生、扩展及扁平颗粒的断裂， 从而使Fe-Al涂层表现出优异的高温耐磨性。
附件:(2004)S1-0154-05
关键字: Fe-Al金属间化合物； 涂层； 高速电弧喷涂； 显微组织； 高温滑动磨损
（National Laboratory for Remanufacturing,
Academy of Armored Forces Engineering,
Beijing 100072, China）
Abstract:The Fe-Al intermetallics coating was produced by cored wires and high velocity arc spraying (HVAS), and the microstructure and sliding wear behavior from room temperature up to 650℃ of the coating were investigated. The results show that the average chemical composition of the coating is Fe-20.0Al-14.1O (molar fraction, %). The microstructure is found to consist of Fe3Al, FeAl and α-Fe phases mainly, together with fine oxide (Al2O3) layers and a little Al. The results of sliding wear indicate that the Fe-Al coating exhibits low wear rate from room temperature to 650℃. The reason of the friction coefficient decreasing at elevated temperatures is that protective oxide film forms on the worn surface during sliding wear process. And delamination is the predominant wear mechanism of the coatings. Fe3Al and FeAl intermetallics which have higher strength and hardness at elevated temperatures can effectively resist crack initiation, propagation and fracture of splat particles, resulting in excellent high temperature wear resistance of the Fe-Al coating.
Key words: Fe-Al intermetallics; coating; high velocity arc spraying; microstructure; high temperature sliding wear
