(1. 河南科技大学 材料科学与工程学院，洛阳 471003；
2. 装甲兵工程学院 材料科学与工程系， 北京 100072；
3. 中国科学院 金属研究所， 沈阳 110015)
摘 要: 采用自制的新型热喷涂粉芯丝材和高速电弧喷涂技术成功制备出Fe3Al金属化合物基合金涂层， 对涂层的组织、 成分和相结构进行了初步分析， 并测试了涂层在室温至650℃的摩擦学特性。 结果表明： Fe3Al涂层的基体相由含29%Al（摩尔分数）的Fe3Al和FeAl二相混合物组成， Fe3Al/WC涂层基体为Fe-26%Al（摩尔分数）合金； 添加少量WC硬质相的Fe3Al/WC涂层具有良好的高温减摩特性和耐磨性， 450℃和650℃其相对耐磨性分别比20g钢高1.92倍和9.23倍； WC/W2C硬质相对Fe3Al基体的强化作用， 以及涂层表面形成具有自保护作用的高硬度致密氧化膜是Fe3Al/WC涂层高温耐磨性提高的主要原因。
关键字: 热喷涂合成； Fe3Al基涂层； 高温摩擦学
（1. Institute of Materials Science and Engineering,
Henan University of Science and Technology, |Luoyang 471003, China;
2. Department of Materials Science and Engineering,
Armored Forces Engineering Institute, Beijing 100072, China;
3. Institute of Metal Research, Chinese Academy of Sciences,
Shenyang 110015, China）
Abstract:Two kinds of novel cored wires for producing Fe3Al-based intermetallic compound alloy coatings by using high velocity arc spray technique were developed. The microstructure, chemical composition and phase structure of Fe3Al-based coatings were investigated. The tribological properties of thermal spray formed Fe3Al-based coatings at temperature ranging up to 650℃ were determined on a pin-on-disk type wear tester. Results show that: the matrix consists of Fe3Al and FeAl phases, which have the average chemical composition of 29%Al(mole fraction); the matrix of Fe3Al/WC composite coating consists of 26%Al(mole fraction); Fe3Al/WC composite coating exhibits excellent friction reduction and wear resistance at elevated temperature. The relative wear resistance of Fe3Al/WC composite coating is 1.92 times and 9.23 times higher than that of the mild steel at temperature of 450℃ and 650℃, respectively. The main reasons for wear resistance improvement are the reinforcement of WC/W2C hard particles to the Fe3Al alloy matrix and the formation of self-protective continuous oxide film on the composite coating surface at elevated temperature.
Key words: thermal spray formation; Fe3Al-based coating; tribology at elevated temperature
