以鎳包碳化鎢粉和CeO₂粉的混合粉為原料，采用激光熔覆技術在42CrMo鋼表面制備WC增強鎳基合金涂層，研究原料中CeO₂質量分數（0~2.0%）對涂層物相組成、顯微組織、硬度和耐磨性能的影響。結果表明：添加CeO₂后涂層的物相由γ-（Ni，Fe）固溶體、Ni₃Fe、WC、Cr₂₃C₆、M₇C₃（M=Fe、Cr）以及少量的CeNi₃組成；涂層與基體間形成了良好的冶金結合；當CeO₂的質量分數為1.0%時，組織致密均勻，細化效果最明顯；隨著CeO₂含量的增加，涂層的硬度呈先升高再下降的趨勢，摩擦因數和磨損量呈先降低后增加的趨勢；添加質量分數1.0% CeO₂涂層的平均硬度最高，為956.0 HV，比未添加CeO₂的提高了29%，平均摩擦因數和平均磨損體積最小，分別為0.383，11.25×10^-3 mm³，與未添加CeO₂的分別降低了27%和20%，涂層的耐磨性能最好，磨損機制為輕微的磨粒磨損。

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.