This study investigates the influence of rare-earth La₂O₃ content on the wear resistance of a laser clad coating. Different contents of nano-rare-earth La₂O₃ were added to a Ni60a/SiC composite powder to analyse the phase composition, element distribution and friction and wear characteristics of the coating to determine the optimum amount of rare-earth La₂O₃ to be added. The results showed that the coating with 2 wt% La₂O₃ added based on the Ni60a/SiC composite powder exhibited the best comprehensive properties. X-ray diffraction and X-ray photoelectron spectroscopy analyses showed that new phases were formed in the coatings with 2 wt% La₂O₃ mainly consisted of hard phases such as Cr₇C₃ and CrC. Scanning electron microscopy revealed that the coating grain with 2 wt% La₂O₃ was refined, the density increased and the distribution of coating elements was more uniform. The wear surface coating was slightly peeled off, and a friction coefficient of 0.63 and a wear depth of 15.79 µm were achieved, which were 3% and 86% lower than those of the 65Mn matrix, respectively. The wear amount was 0.002 g. The wear surface experienced an oxidation reaction.

本研究调查了稀土 La ₂ O ₃含量对激光熔覆涂层耐磨性的影响。将不同含量的纳米稀土La ₂ O ₃添加到Ni60a/SiC复合粉体中，分析涂层的相组成、元素分布和摩擦磨损特性，确定稀土La ₂ O ₃的最佳添加量要添加。结果表明，含 2 wt% La ₂ O ₃的涂层以Ni60a/SiC复合粉体为基础添加的复合粉体表现出最佳的综合性能。X射线衍射和X射线光电子能谱分析表明，在含2wt%的La ₂ O ₃的涂层中形成了新相，主要由Cr ₇ C ₃和CrC等硬质相组成。扫描电镜显示，含 2 wt% La ₂ O ₃的涂层晶粒细化，密度增加，涂层元素分布更均匀。磨损表面涂层轻微剥落，摩擦系数为0.63，磨损深度为15.79 µm，分别比65Mn基体低3%和86%。磨损量为0.002g。磨损表面发生氧化反应。