Ti6Al4V合金激光熔覆Co-Ti3SiC2复合涂层的组织和摩擦学性能

为改善Ti6Al4V合金的摩擦学性能,分别用纯Co、Co-2%Ti₃SiC₂、Co-5%Ti₃SiC₂、Co-8%Ti₃SiC₂混合粉末为原料,在Ti6Al4V合金表面激光熔覆制备复合涂层,利用X射线衍射仪(XRD)、扫描电镜(SEM)以及摩擦磨损试验机分析物相组成、显微组织结构以及在常温下的摩擦学性能。结果表明:所有复合涂层与基体结合良好,伴有少部分微孔。纯Co涂层的主要物相为γ-Co、CoTi、CoTi₂等,而Co-Ti₃SiC₂涂层物相包括γ-Co、CoTi、CoTi₂、TiC、Ti₅Si₃和残留的Ti₃SiC₂。涂层的硬度相对基体提高了1.90~2.15倍,而耐磨性能相应提高了3.02~5.44倍。

Microstructure and tribological properties of laser clad Co-Ti3SiC2 composite coating on Ti6A14V alloy

To improve the tribological properties of Ti6Al4V alloy, the laser clad composite coatings were prepared on the surface of Ti6Al4V alloy using pure Co powder, Co-2%Ti₃SiC₂, Co-5%Ti₃SiC₂, and Co-8%Ti₃SiC₂ mixed powder as raw materials. The phase composition, microstructure and tribological properties of the coatings at room temperature were analyzed by means of X-ray diffraction (XRD), scanning electron microscope (SEM) and friction wear testing machine. The results show that all the composite coatings are bonded well with the substrate, with some porosities observed, and the main phases of the pure Co coating consist of γ-Co, CoTi, and CoTi₂, while the phases of the Co-Ti₃SiC₂ coatings consist of γ-Co, CoTi, CoTi₂, TiC, Ti₅Si₃ and residual Ti₃SiC₂. The hardness of the coatings is increased by 1.90-2.15 times compared with the matrix, and the wear resistance is correspondingly improved by 3.02 to 5.44 times.