FeAlCrBSiNb非晶涂层形成机理和摩擦磨损行为

Forming Mechanisms and Tribological Properties of FeAlCrBSiNb Amorphous Coating Deposited by High Velocity Arc Spaying

研发了一种FeAlCrBSiNb粉芯丝材,采用高速电弧喷涂技术在45钢基体上制备相应涂层。通过SEM,TEM和XRD表征涂层微观组织和相成分,阐述FeAlCrBSiNb非晶涂层的形成机理,利用显微硬度计,万能拉伸试验机和环-块式摩擦磨损试验机,分析涂层力学性能和摩擦磨损行为。结果表明:涂层主要由非晶相和弥散分布其中的α-(Fe),(Fe,Cr),CrB和Fe3Al微晶纳米晶相组成,非晶相体积含量大于91.3%;涂层呈层状结构,结构致密,总体孔隙率约为2%;平均显微硬度值为850HV0.1,是基体45钢的4倍;优良的磨损抗力使其相对耐磨性是45钢的5倍,其磨损机制主要为剥落引起的剥落磨损。

A new FeAlCrBSiNb cored wire was designed to prepare coating by high velocity arc spraying on 45 steel. Phase composition and microtructure of Fe Al Cr BSi Nb coatings were characterized by SEM,XRD and TEM. The formation mechanism of the amorphous coating was discussed. Then the wear behavior and mechanical properties of the coating were investigated by ring-block tribometer,universal testing machine and microhardness tester. The results show that the coating consists of amorphous,α-Fe,（ Fe,Cr）,Fe3 Al microcrystalline phase,and the volume fraction of amorphous phase is 91. 3%. The coating has very compact structure with low porosity of2%. The average microhardness of the coating can reach approximately 850 HV0. 1,which is 4 times of that of 45 steel. Wear resistance of the coating is excellent,which is 5 times of that of 45 steel under dry friction condition. The main wear mechanism is brittle flakingoff.