超音速电弧喷涂 FeCrBNiSiCRE 非晶涂层的干滑动摩擦学行为

摘要

为了研究非晶涂层的摩擦磨损行为，采用超音速电弧喷涂技术在低碳钢基体上制备了 FeCrBNiSiCRE 非晶涂层，并对其组织结构、显微硬度及干滑动摩擦学行为进行了研究。结果表明：制备的 FeCrBNiSiCRE 非晶涂层与基体结合良好，结构致密，只含有少量的微小孔隙；FeCrBNiSiCRE 非晶涂层的显微硬度 HV 达到876，为基体硬度的4倍左右；在干滑动摩擦条件下， FeCrBNiSiCRE 非晶涂层的摩擦因数随着时间的增加逐渐增大，最后稳定在0．7附近；在相同的摩擦磨损试验条件下，FeCrB-NiSiCRE 非晶涂层的相对耐磨性是基体的3．2倍，磨损机制为典型的颗粒脆性剥落和微裂纹扩展。FeCrBNiSiCRE 非晶涂层优异的耐磨性能归因于涂层均匀的非晶结构和高硬度。%In order to investigate the tribological behavior of the Fe-based amorphous coating,FeCrBNiSiCRE amorphous coating was sprayed onto the low carbon steel substrate by the ultrasonic electric-arc spraying.The microstructure,microhardness and dry sliding friction behavior of FeCrBNiSiCRE amorphous coating were investigated.The results showed the coating with homo-geneous microstructure adhered well to the substrate.Only a small amount of microporosity appeared in the coating.The Vickers hardness of the coating is as high as 876.It is about 4 times than that of the low carbon steel substrate.Under the condition of dry sliding friction,friction coefficient of FeCrBNiSiCRE amorphous coating increases with the sliding time,and finally is stabi-lized at the vicinity of 0.7.The relatively wear resistance of the amorphous alloy coating is about 3.2 times as large as that of low carbon steel under the same wear testing condition.The main failure mechanism of FeCrBNiSiCRE amorphous coating is the brit-tle spalling of particle and the propagation of microcracks.The excellent wear resistance of FeCrBNiSiCRE amorphous coating is attributed to the uniform amorphous structure in the coating and the intrinsic high hardness of the amorphous coating.