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为了提高Fe-Al金属间化合物涂层的结合强度和耐磨性,改善其室温韧性,研制了一种新型FeAlCr电弧喷涂粉芯丝材,利用高速电弧喷涂技术在45#钢基体表面制备了涂层。采用扫描电镜(SEM)、能谱仪(EDAX)和X射线衍射仪分析了涂层的微观结构和微区成分,用显微硬度计、拉伸试验机和CETR微动摩擦磨损试验机等试验设备对涂层的力学性能进行了分析。结果表明,喷涂FeAlCr粉芯丝材过程中合金元素反应充分,涂层组织均匀、致密,氧化物含量极低。主要相组成有Fe-Al、Ni3Al金属间化合物,硬质相Cr3C2、氧化物Cr2O3和Al2O3弥散分布在韧性相α-Fe基体上。涂层平均HV显微硬度为5.50 GPa,约是基体的2倍,平均结合强度约47.2 MPa,载荷100 N油润滑条件下涂层的耐磨性高于基体,磨损率随着摩擦过程的进行呈降低趋势。
In order to improve the bonding strength and wear resistance of Fe-Al intermetallic coatings and improve the room temperature toughness, a new type of FeAlCr arc spray cored wire was developed. The surface of 45 # steel was coated by high speed arc spraying Floor. The microstructure and micro-composition of the coatings were analyzed by scanning electron microscope (SEM), energy dispersive spectrometer (EDAX) and X-ray diffractometer. The microhardness tester, tensile testing machine and CETR fretting friction and wear tester The device analyzes the mechanical properties of the coating. The results show that alloying elements are fully reacted during spraying FeAlCr cored wire, the coating is uniform, dense and the oxide content is very low. The main phase is composed of Fe-Al, Ni3Al intermetallic compounds, hard phase Cr3C2, oxide Cr2O3 and Al2O3 dispersed in the toughness phase α-Fe matrix. The average HV microhardness of the coating is 5.50 GPa, which is about twice that of the matrix and the average bonding strength is about 47.2 MPa. The wear resistance of the coating is higher than that of the matrix under the condition of 100 N oil lubrication. The wear rate increases with the friction process Showing a downward trend.