TC4钛合金表面激光熔覆含La2O3的F101镍基涂层

F101 Ni-based coating containing La2O3 by laser cladding on TC4 titanium alloy

摘要:

以F101镍基自熔性合金粉末和含氧化镧（2%wt）的F101镍基自熔性合金粉末为原料，在合适的激光熔覆参数下，在TC4钛合金表面制备了F101镍基合金涂层及F101 2%La2O3镍基合金涂层，对比分析了两种涂层的宏观形貌、相组成、微观组织、显微硬度及与YG6在干摩擦磨损条件下摩擦磨损性能。结果表明:稀土La2O3的添加有效提高了F101镍基合金粉末对激光辐照能量的吸收率；涂层形成更多富Ti物相，组织更加均匀致密；虽然基材元素扩散到涂层中一定程度上降低了涂层的硬度和耐磨性，但与TC4钛合金相比，涂层仍具有较低的摩擦系数（0.41 vs 0.45）和较高的耐磨性（TC4的2.89倍）。 关键词：TC4钛合金；激光熔覆；镍基合金；La2O3；摩擦磨损性能

Abstract:

F101 Ni-based alloy coating and F101 Ni-based alloy coating with 2%wt La2O3 were fabricated on TC4 titanium alloy, under proper laser cladding parameter, using F101 Ni-based fluxed alloy powder and F101 Ni-based fluxed alloy powder with 2%wt La2O3. Macro morphology, phase composition, microstructure, microhardness and friction properties of 2 kinds of the coatings were compared and analysed. The results show that: adding rare-earth La2O3 effectively improves the absorption rate of laser irradiation; more Ti-rich phases are formed and the uniformity and densification of the microstructure are improved; To some extent, the hardness and friction property of the coating are reduced due to the excessive elements diffusion from TC4 matrix into the coating, but compared with TC4, the friction coefficient of the coating is reduced (0.41 vs 0.45) and the friction property is still 2.89 times of TC4.