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采用SEM，TEM及EDAX等手段研究了45钢表面Al2O3－NiCrAl复合陶瓷涂层的组织结构，实验结果表明：Al2O3－NiCrAl复合陶瓷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，Al2O3与NiCrAl及NiCrAl与基体间均为机械结合界面：激光熔覆层组织为单一的α－Al2O3柱状晶、过渡合金与基体间形成了良好的冶金结合界面，Al2O3与NiCrAl间的界面结合状况得到了明显的改善，在激光熔覆过程中存在着分层凝固机制．熔敷层硬度达2423－2664HV0．2
The microstructure of Al2O3-NiCrAl composite ceramic coating on 45 steel was studied by means of SEM, TEM and EDAX. The experimental results show that the microstructure of Al2O3-NiCrAl composite ceramic sprayed layer is lamellar and the surface layer is composed of α-Al2O3 and A small amount of γ-Al2O3 composition, Al2O3 and NiCrAl and NiCrAl and the matrix are mechanical bonding interface: the laser cladding layer is a single α-Al2O3 columnar crystal, the transition alloy and the matrix formed a good metallurgical bonding interface, Al2O3 and NiCrAl interfacial bonding between the state has been significantly improved in the laser cladding process exists stratified solidification mechanism. Fusion layer hardness of 2423-2664HV0.2