油润滑条件下FeBSiNb非晶涂层磨损性能研究

Wear Behavior of FeBSiNb Metallic Glass Coating under Oil Lubrication

基于机器人自动化高速电弧喷涂技术在45#钢基体上制备了FeBSiNb非晶涂层.研究了非晶涂层在油润滑条件下磨损时间、线速度和载荷对涂层的磨损行为.采用扫描电镜(SEM)、能谱分析仪(EDAX)和X射线衍射仪(XRD)等仪器对涂层的组织结构进行了表征,利用纳米压痕仪对涂层的微观力学性能进行了分析.结果表明:涂层具有非晶态结构,组织均匀,层状结构紧凑,具有较低的孔隙率(1.4%)和较高的显微硬度(16.42 GPa).随着磨损速度升高,载荷增加,涂层的磨损率也随之增加.FeBSiNb非晶涂层具有良好的耐磨性,同一磨损条件下,其相对耐磨性为3Cr13涂层的6倍.FeBSiNb非晶涂层的磨损机制主要为脆性疲劳剥落.

A FeBSiNb metallic glass coating is prepared by using wires arc spraying. The effect of wear parameters, e.g. wear time, linear speed and loading, on the wear properties of the coating is studied. The microstructure of the coating is characterized by using SEM, EDAX and XRD. The mechanical properties of the coating are measured on a nano - indenter. The wear test of the coating is conducted on an MM200 wear tester. The results show that the coating has an amorphous structure. The coating is fully dense with a porosity of 1.4% and a high micro - hardness of 16.42 GPa. With increasing wear time, linear speed and loading, wear rates of the coating increase. The FeBSiNb metallic glass coating presents excellent wear resistance. The relative wear resistance of FeBSiNb metallic glass coating is about 6 times higher than that of the 3Cr13 coating under the same testing condition. The failure mechanism of FeBSiNb metallic glass coating is brittle fatigue and fracture.