超音速火焰喷涂(HVAF) WC-Co合金涂层微观组织与耐磨性分析

Microstructure and wear resistance of WC-Co coating deposited by high velocity air-fuel spraying

采用超音速火焰喷涂(HVAF)工艺在Q235基体上制备了WC-Co涂层,并研究了涂层的显微组织和磨损性能。结果表明:WC-Co涂层与基体结合良好,涂层致密,孔隙率较低,微观形貌呈层状结构。EDS能谱表明涂层发生了较低氧化。涂层的显微硬度高达1244HV0.1。涂层开始时失重磨损率较高,而且随着法向载荷的增大而增加,随着时间增加磨损率不断降低,体现了WC-Co涂层优异的耐磨性能。

The WC-Co coatings were deposited on Q235 substrate by high velocity air -fuel spray （HVAF） process. Microstructures and wear property of the coatings have studied in this paper. The results show that the coatings bond well with the substrate. The coatings have layered structure with high density and low void ratio. EDS spectrum showed that the coatings low oxidation occurr. The maximum hardness of the coatings is 1 244 HV0.1. The wear rate of the coatings is higher at the beginning, increase with the increase of normal load and decrease with increase over time. This shows that the WC-Co coatings have excellent wear resistance.