(湖南大学 材料科学与工程学院，长沙 410082)
摘 要: 采用超音速火焰喷涂工艺在16Mn钢上制备了WC-12Co涂层，并测试了该涂层的力学性能特别是其抗磨粒磨损性能。结果表明：WC-12Co涂层的主相为碳化钨，显微硬度为(1341.0±134.3)HV，孔隙率为0.21%±0.04%。该涂层的磨损率随着磨粒硬度、磨粒粒度和加载载荷的增加而增加。当磨粒的硬度低于涂层硬度时，涂层的磨损机制以磨耗磨损为主，磨损率低；当磨粒的硬度超过涂层的硬度时，涂层的磨损以微切削为主，磨损率高。另外，WC-12Co涂层的耐磨性相对于16Mn钢也是随着磨粒的硬度变化而变化。
关键字: WC-Co涂层；超音速火焰；磨粒磨损
（College of Materials Science and Engineering, Hunan University, Changsha 410082, China）
Abstract:WC-12Co coating was deposited on the 16Mn steel by high velocity oxygen flame (HVOF) process. The mechanical performances, especially, the abrasive wear behavior, of WC-12Co coating were investigated. The results show that the hardness and porosity of the coating are (1341.0±134.3) HV and 0.21%±0.04%, respectively. The wear rate of the WC-12Co coating increases with increasing the hardness, the size and the employed loadings of the abrasives. The abrasive wear mechanism of the WC-12Co coating is mainly abrasion wear and the wear rate is low when the hardness of the abrasive is lower than that of the coating. However, the wear mechanism of the WC-12Co coating is mainly micro-cutting and the wear rate is very high when the hardness of the abrasive is higher than that of the coating. In addition, compared to the 16Mn steel, the relative abrasive wear resistance of the WC-12Co varies with the change of hardness of the abrasives.
Key words: WC-Co coating; high velocity oxygen flame; abrasive wear
