中文摘要：

采用超音速火焰喷涂（high velocity oxy-fuel,HVOF）工艺分别制备了双峰结构和常规结构的WC–CoCr复合涂层。比较了不同结构WC–CoCr涂层的组织结构、显微硬度和断裂韧性;在涂层磨粒磨损实验的基础上,探讨了双峰结构WC–CoCr涂层的磨损机理。结果表明：与常规结构的WC–CoCr复合涂层相比,在由含质量分数30%超细WC粉末制备的双峰结构涂层中,WC在黏结相中溶解最多,断裂韧性最低;由含质量分数50%超细WC粉末制备的双峰结构涂层最致密,显微硬度与断裂韧性最高,耐磨粒磨损性能最优良。

英文摘要：

WC-CoCr composite coatings in bimodal and conventional structures were deposited by high velocity oxy-fuel （HVOF）, respectively. The microstructure, microhardness, and fracture toughness of the coatings with different WC particle size distributions were studied, the coating abrasive wear characteristics were carried out by dry-sand rubber wheel abrasion tester, and the wear failure mechanisms of the coatings were investigated. The results show that, the bimodal structure coating fabricated by the powder containing 30wt% ultrafine WC particles demonstrates the most dissolution of WC in binder during deposition and the lowest coating fracture toughness. However, the bimodal structure coating fabricated by the powder containing 50wt% ultrafine WC particles combines the least porosity, the greatest microhardness and fracture toughness, and the most superior wear resistance.