铁基非晶纳米晶涂层的耐磨性研究

采用基于机器人的自动化高速电弧喷涂技术在45钢基体上制备了FeCrBSiMnNbY非晶纳米晶涂层。研究了非晶纳米晶涂层在油润滑条件下，不同磨损时间、速度、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）对涂层的组织结构进行了表征，利用纳米压痕仪对涂层的力学性能进行了分析，摩擦磨损试验在MM200滑块磨损试验机上进行。结果表明：涂层组织均匀，结构致密，主要由非晶相和α-Fe相纳米晶组成；在相同磨损试验条件下，非晶纳米晶涂层的相对耐磨性为3Cr13涂层的4．6倍，磨损机制主要为脆性疲劳剥落。

Anti-wear Properties of Fe-based Amorphous and Nanocrystalline Coating

The FeCrBSiMnNbY amorphous and nanocrystalline coating is prepared by using the wire arc spraying process on the 45 steel substrate. The effect of wear parameters, such as wear time, line speed and loading, on the wear properties of Fe-based amorphous and nanocrystalline coating is studied. The microstructure of the coating is characterized by the SEM, EDAX and XRD. The mechanical properties of the coating are measured on nano-indention MM200 wear tester. The results show that the coating consists of amorphous phase and nanocrystalline α-Fe phase. The coating is fully dense with low porosity, little oxide and high micro-hardness. The amorphous and nanocrystalline coating presents an excellent wear resistance, in which the relative wear resistance is about 4.6 times higher than that of the 3Cr13 coating under the same test condition. The amorphous and nanocrystalline coating exhibits the brittle spalling failure mechanism.