本文用Ｘ射线衍射、扫描电镜和显微硬度研究了等离子喷涂Ａｌ２Ｏ３ ＋ １３ｗｔ％ ＴｉＯ２ 陶瓷涂层激光重熔处理后陶瓷熔化层的组织结构及硬度变化特征。激光重熔区亚稳相∪Ａｌ２Ｏ３ 转变成为稳定相α－ Ａｌ２Ｏ３ ；ＴｉＯ２ 与Ａｌ２Ｏ３ 反应生成ＴｉＡｌ２Ｏ５。陶瓷熔化层致密、无孔隙、少裂纹或无裂纹；熔化层硬度有较大提高，且随激光能量密度的增大而增大，而涂层设计对其影响很小。此外，激光重熔能极大地提高陶瓷涂层的耐磨性。 In this paper, XRD, SEM and microhardness were used to study the microstructure and hardness variation of the ceramic melt layer after plasma sprayed Al2O3 + 13wt% TiO2 ceramic coating. The metastable phase ∪Al2O3 in the laser remelting area is transformed into α-Al2O3 with stable phase, and TiAl2O5 is formed by the reaction between TiO2 and Al2O3. The ceramic melted layer is dense, non-porous, less cracked or crack-free. The hardness of the melted layer is greatly increased, and increases with the increase of the laser energy density. However, the design of the coating has little effect on it. In addition, laser remelting can greatly improve the wear resistance of ceramic coatings.