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用Ｘ 射线衍射、扫描电镜和显微硬度研究了等离子喷涂Ａｌ２Ｏ３ 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γ－ Ａｌ２Ｏ３ 转变成为稳定相α－ Ａｌ２Ｏ３；陶瓷熔化层致密、无孔隙，但存在裂纹；熔化层硬度有较大提高，且随激光能量密度的增大而增大，而与涂层设计几乎无关。此外，激光重熔能较大地提高Ａｌ２Ｏ３ 陶瓷涂层的耐磨性。
XRD, SEM and microhardness were used to study the microstructure and hardness variation of the ceramic melt layer after plasma sprayed Al2O3 ceramic coating laser remelting. The metastable phase γ-Al 2 O 3 in the laser remelted area was transformed into the α-Al 2 O 3 phase with stable phase. The ceramic melted layer was dense and non-porous but cracked. The hardness of the melted layer increased greatly and increased with the increase of laser energy density. And has nothing to do with the coating design. In addition, laser remelting can greatly improve the wear resistance of Al2O3 ceramic coating.