以镍包碳化钨粉和CeO₂粉的混合粉为原料，采用激光熔覆技术在42CrMo钢表面制备WC增强镍基合金涂层，研究原料中CeO₂质量分数（0~2.0%）对涂层物相组成、显微组织、硬度和耐磨性能的影响。结果表明：添加CeO₂后涂层的物相由γ-（Ni，Fe）固溶体、Ni₃Fe、WC、Cr₂₃C₆、M₇C₃（M=Fe、Cr）以及少量的CeNi₃组成；涂层与基体间形成了良好的冶金结合；当CeO₂的质量分数为1.0%时，组织致密均匀，细化效果最明显；随着CeO₂含量的增加，涂层的硬度呈先升高再下降的趋势，摩擦因数和磨损量呈先降低后增加的趋势；添加质量分数1.0% CeO₂涂层的平均硬度最高，为956.0 HV，比未添加CeO₂的提高了29%，平均摩擦因数和平均磨损体积最小，分别为0.383，11.25×10^-3 mm³，与未添加CeO₂的分别降低了27%和20%，涂层的耐磨性能最好，磨损机制为轻微的磨粒磨损。

The mixed powders with nickel-coated tungsten carbide powder and CeO₂ powder was used as raw materials, WC reinforced nickel-based alloy coating was prepared on the surface of 42CrMo steel by laser cladding technique. The effect of mass fraction (0-2.0%) of CeO₂ in raw materials on the phase composition, microstructure, hardness and wear resistance of the coating was investigated. The results show that the phase of the coating with CeO₂ was composed of γ-(Ni, Fe) solid solution, Ni₃Fe, WC, Cr₂₃C₆, M₇C₃ (M=Fe, Cr) and a small amount of CeNi₃. A good metallurgical bond was formed between the coating and the substrate. When the mass fraction of CeO₂ was 1.0%, the structure was dense and uniform, and the refinement effect was the most obvious. With increasing CeO₂ content, the hardness of the coating increased first and then decreased, and the friction coefficient and the amount of wear decreased first and then increased. The average hardness of the coating with 1.0% CeO₂ was the highest, which was 956.0 HV, and increased by 29% compared with that without CeO₂; the average friction coefficient and the average wear volume were the smallest, which were 0.383 and 11.25×10^-3 mm³, and were reduced by 27% and 20% compared with those without CeO₂, respectively. The wear resistance of the coating with 1.0% CeO₂ was the best, and the wear mechanism of the coating was slight abrasive wear.