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研究了Ａｌ２Ｏ３－ＣｏＣｒＡｌＹ复合陶瓷涂层的组织结构、成分分布及其耐磨性能．结果表明：等离子喷涂层的组织呈层片状，面层由α－Ａｌ２Ｏ３和少量的γ－Ａｌ２Ｏ３组成，层间为机械结合界面，涂层平均硬度为８９７ＨＶ０．２．经激光重熔后的组织为单一的α－Ａｌ２Ｏ３柱状晶，在ＣｏＣｒＡｌＹ与基体间有界面相形成，其界面为冶金结合，层间存在着平缓的成分过渡；Ａｌ２Ｏ３与ＣｏＣｒＡｌＹ间的界面结合状况得到了明显的改善．熔覆后的Ａｌ２Ｏ３涂层硬度达２４７９～２６９１ＨＶ０．２，耐磨性能为原始涂层２～３倍，其磨损机制是疲劳磨损和磨料磨损
The microstructure, composition distribution and wear resistance of Al2O3-CoCrAlY composite ceramic coatings were studied. The results show that the microstructure of the plasma sprayed coating is lamellar, the surface layer is composed of α-Al2O3 and a small amount of γ-Al2O3, the interface between the layers is a mechanical interface, and the average hardness of the coating is 897 HV0.2. After laser remelting, the microstructure was a single α-Al2O3 columnar crystal with interfacial phase between CoCrAlY and matrix. The interface was metallurgical bonding, and there was a gentle transition between the layers. The interfacial bonding between Al2O3 and CoCrAlY Significant improvement. After the cladding Al2O3 coating hardness of 2479 ~ 2691HV0.2, wear resistance of the original coating 2 to 3 times, the wear mechanism is fatigue wear and abrasive wear