TC4钛合金表面激光熔覆含La_2O_3的F101镍基涂层  

F101 Ni-based Coating Containing La_2O_3 by Laser Cladding on TC4 Titanium Alloy

作　　者：何星华[1] 许晓静[1] 戈晓岚[1] 陶俊[1] 仲奕颖 刘庆辉[1] 吴桂兰[1] 

机构地区：[1]江苏大学先进制造与现代装备技术工程研究院,江苏镇江212013

出　　处：《稀有金属材料与工程》2017年第4期1074-1079,共6页Rare Metal Materials and Engineering

基　　金：江苏大学拔尖人才工程基金(1211110001);江苏省优势学科资助

摘　　要：以F101镍基自熔性合金粉末和含氧化镧(2%,质量分数)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%La_2O_3镍基合金涂层,对比分析了2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)。F101 Ni-based alloy coating and F101＋2 wt% La2O3 Ni-based alloy coating were fabricated on TC4 titanium alloy surface with proper laser cladding parameters, using F 101 Ni-based self-melting alloy powder and F 101 Ni-based self-melting alloy powder with 2 wt% La2O3 as starting materials. Macro morphology, phase composition, microstructure, microhardness and friction properties of the two kinds of coatings were compared. Results show that rare-earth La2O3 effectively improves the absorption rate of laser irradiation. More Ti-rich phases are formed and the microstructure is more uniform and denser in the F 101 ＋2 wt% La2O3 coating. Although the hardness and friction property of the F101＋2 wt% La2O3 coating are reduced to some extent due to the excessive elements diffusion from TC4 matrix into the coating, the friction coefficient of the coating is lower （0.41 vs 0.45） and the wear resistance is 2.89 times higher than that of TC4.

关 键 词：TC4钛合金 激光熔覆 镍基合金 LA2O3 摩擦磨损性能 

分 类 号：TG174.44[金属学及工艺—金属表面处理]