钛合金表面激光熔覆镍-铬-硅复合涂层的显微组织和摩擦学性能

Microstructure and Tribological Property of Laser Cladding Ni-Cr-Si Composite Coatings on Titanium Alloy

摘要: 在Ti-5621s合金表面采用激光熔覆制备了镍-铬-硅复合涂层,分析了涂层的显微组织,测试了涂层的硬度和摩擦学性能.结果表明:复合涂层中以Ti5Si3和Cr3Si为主的颗粒增强相弥散分布在β-Ti和γ-Ni两相固溶体中;涂层的硬度较基体有显著的提高;由于金属硅化物Ti5Si3和Cr3Si的高硬度、强原子间结合力,该复合涂层明显地改善了基体合金的摩擦和磨损性能.

Abstract: Laser cladding of Ni-Cr-Si composite coatings were prepared on Ti-5621s alloy.Microstructure,microhardness,friction and wear properties of the coating were examined.The results show that main reinforcing particles of the composite coating are Ti5Si3 and Cr3Si,which dispersed in the β-Ti and γ-Ni solid solution.The microhardness of the coating increases prominently compared to that of the matrix.Because Ti5Si3 and Cr3Si have high hardness and strong covalent-dominated atomic bonds,the Ni-Cr-Si coating enhances the friction and wear properties of Ti-5621s alloy greatly.