TC11表面缆式焊丝-粉末等离子熔覆技术制备AlCu2(NiCr)2Ti-(WC)x高熵合金复合涂层的显微组织和磨损性能

Microstructure and Wear Properties of AlCu2(NiCr)2Ti-(WC)x HEA Composite Coatings on TC11 via Coincident CWW-Powder Plasma Cladding

摘要:

采用AlCu₂(NiCr)₂Ti缆式焊丝（CWW）和碳化钨（WC）粉末混合模式，通过等离子熔覆技术制备了高熵合金复合涂层 AlCu₂(NiCr)₂Ti-(WC)_x (x=0, 25, 50, 75 r/min)。研究了WC送粉速度对所制备涂层的显微组织、硬度和磨损性能的影响。结果表明，涂层由体心立方主相和面心立方次相组成，WC的加入形成了碳化物增强相。与基体相比，涂层的硬度和耐磨性能显著提高。当WC送粉速度为50 r/min时，涂层的耐磨性能最佳，体积磨损率最小，为8.5869×10^-6 mm³·N^-1·m^-1，极大地改善了TC11表面的磨损性能。CWW和WC粉末在等离子熔覆中的协同输送为制备耐磨性增强的高熵合金复合涂层提供了一种可行的技术支持。

Abstract:

The high-entropy alloy composite coatings AlCu₂Ti(NiCr)₂-(WC)_x (x denotes powder feeding speeds, including 0, 25, 50, and 75 r/min) were prepared by plasma cladding using a hybrid mode of AlCu₂(NiCr)₂Ti cable-type welding wire (CWW) and tungsten carbide (WC) powder. The effect of WC powder feeding speed on the microstructure, hardness, and wear properties of the prepared coatings was investigated. The results show that the coatings consist of body-centered cubic main phases and face-centered cubic secondary phases, with carbide reinforcement phases formed due to the addition of WC. The hardness and wear resistance of the coatings are significantly improved compared to the TC11 substrate. When WC powder feeding speed is set at 50 r/min, the coating exhibits optimal wear resistance, with a minimum volume wear rate of 8.5869×10^-6 mm³·N^-1·m^-1, greatly improving the wear properties of TC11 surface. The coincident CWW-powder plasma cladding provides a viable method for the preparation of high-entropy alloy composite coatings with enhanced wear resistance.