(1. 河南科技大學 材料科學與工程學院，洛陽 471003；
2. 裝甲兵工程學院 材料科學與工程系， 北京 100072；
3. 中國科學院 金屬研究所， 沈陽 110015)
摘 要: 采用自制的新型熱噴涂粉芯絲材和高速電弧噴涂技術成功制備出Fe3Al金屬化合物基合金涂層， 對涂層的組織、 成分和相結(jié)構(gòu)進行了初步分析， 并測試了涂層在室溫至650℃的摩擦學特性。 結(jié)果表明： Fe3Al涂層的基體相由含29%Al（摩爾分數(shù)）的Fe3Al和FeAl二相混合物組成， Fe3Al/WC涂層基體為Fe-26%Al（摩爾分數(shù)）合金； 添加少量WC硬質(zhì)相的Fe3Al/WC涂層具有良好的高溫減摩特性和耐磨性， 450℃和650℃其相對耐磨性分別比20g鋼高1.92倍和9.23倍； WC/W2C硬質(zhì)相對Fe3Al基體的強化作用， 以及涂層表面形成具有自保護作用的高硬度致密氧化膜是Fe3Al/WC涂層高溫耐磨性提高的主要原因。
關鍵字: 熱噴涂合成； Fe3Al基涂層； 高溫摩擦學
MA Shi-ning2, ZHANG Wei2, LI Shi-zhuo3
（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
