目的 研究铜的添加对Al2O3涂层摩擦磨损性能的影响。方法 采用等离子喷涂技术在20钢表面分别制备Al2O3和Cu-Al2O3涂层。对两种涂层显微硬度、结合强度、摩擦磨损性能进行对比研究，并分析涂层的相组成、组织结构、磨损形貌。结果 Al2O3原始粉末含有α-Al2O3相，制成涂层后有γ-Al2O3新相生成。Cu-Al2O3原始粉末主要由Cu、α-Al2O3相组成，所制备Cu-Al2O3涂层有γ-Al2O3和Cu2O新相生成。两种涂层均由基体、粘结层、涂层组成，各层之间有明显的界面，层与层之间结合良好。Cu-Al2O3涂层较Al2O3涂层孔隙、微裂纹减少。添加铜后，结合强度明显提高，Al2O3涂层的结合强度为7.56 MPa，Cu-Al2O3涂层的结合强度为15.96 MPa，而显微硬度变化不大。Cu-Al2O3涂层的摩擦系数明显降低，且波动幅度较小；磨损率为5.93×10?4 mm3/m，比Al2O3涂层降低了14.68 %。与Al2O3涂层相比，Cu-Al2O3涂层磨痕处剥落坑面积减小，磨损表面比较平整，剥落现象减轻，主要磨损机制为剥落。结论 铜的添加改善了Al2O3涂层的摩擦磨损性能。

The work aims to study the effect of copper on the friction and wear properties of Al2O3 coatings. Al2O3 and Cu-Al2O3 coatings were prepared on the surface of 20 steel by plasma spraying. The microhardness, bond strength and friction and wear properties of the two coatings were compared and the phase composition, microstructure and wear morphology of the coatings were analyzed. The Al2O3 raw powder contained α-Al2O3 phase, and a new phase of γ-Al2O3 was formed after coating was prepared. The Cu-Al2O3 raw powder was mainly composed of Cu and α-Al2O3 phases. The Cu-Al2O3 coating had a new phase of γ-Al2O3 and Cu2O. Both coatings consisted of a matrix, a tie layer, and a coating. There was a distinct interface between the layers, and the bond between the layers was good. The Cu-Al2O3 coating had fewer porosity and microcracks than the Al2O3 coating. After copper was added, the bonding strength was obviously improved. The bonding strength of Al2O3 coating was 7.56 MPa. The bonding strength of Cu-Al2O3 coating was 15.96 MPa. The microhardness did not change much. The friction coefficient of Cu-Al2O3 coating was significantly reduced and the fluctuation range was small. The wear rate was reduced, and the wear rate of Cu-Al2O3 coating was 5.93×10?4 mm3/m, which was 14.68% lower than that of Al2O3 coating. Compared with the Al2O3 coating, the Cu-Al2O3 coating had smaller peeling pit, the wear surface was relatively flat, the peeling phenomenon was reduced, and the main wear mechanism was spalling. The addition of copper improves the friction and wear properties of the Al2O3 coating.