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基于机器人自动化高速电弧喷涂技术在45#钢基体上制备了铁基纳米结构涂层.研究了纳米结构涂层在不同磨损速度、不同载荷下的磨损行为,并利用3Cr13涂层进行对比试验.采用扫描电镜、能谱分析仪,透射电镜和X射线衍射仪等设备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.结果表明:涂层的组织主要由非晶相和α(Fe,Cr)相纳米晶组成;平均尺寸为46nm的α(Fe,Cr)相纳米晶均匀分布于非晶基体内.涂层的组织均匀,结构致密,平均孔隙率含量为1.7%.纳米结构涂层具有较高的显微硬度;随着磨损速度升高,载荷增加,纳米结构涂层的磨损量也随之增加.纳米结构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2.6倍.纳米结构涂层主要磨损机制为脆性断裂机制.
The iron-based nanostructured coatings were prepared on 45 # steel based on robotic automated high-speed arc spraying technology.The wear behavior of nanostructured coatings at different wear rates and loads was studied and compared with 3Cr13 coating.Using SEM, EDS, TEM and X-ray diffractometer were used to characterize the microstructure of the coating and the mechanical properties of the coating were analyzed by nano indenter.The results showed that the microstructure of the coating mainly The nanocrystalline α (Fe, Cr) nanocrystals with an average size of 46 nm are uniformly distributed in the amorphous matrix, and the microstructure of the coating is uniform and compact with the average porosity The content of 1.7% .Nano-structured coating with high microhardness; with the wear rate increases, the load increases, the amount of wear nano-structured coating also increases.Nano-structured coating has good wear resistance, Under the same wear condition, the relative abrasion resistance is 2.6 times that of 3Cr13 coating.The main wear mechanism of nanostructured coatings is brittle fracture mechanism.