Abstract：Al2O3-TiO2 coatings were prepared by laser cladding on nickel-based alloy with the assistance of other different technologies. The result shows that there are a lot of cracks and flake phenomenon with the coating by laser cladding, while the whole ceramic coating prepared by laser cladding spalled from substrate preheated. The excellent performance of ceramic coating was achieved by laser cladding with the assistance of high frequency induction sources and isostatic pressing(CIP) technology. Microstructures of the laser sintered samples were characterized by scanning electron microscope（SEM). The surface of Al2O3-TiO2 ceramic has high compactness and strong bonding strength with no obvious cracks and porous in the interface between ceramic coating and bond coating. According to experiment results, it can be deduced that the increasing of ceramic powders density and the decreasing of temperature gradient in laser cladding process can improve ceramic formability obviously.
2011, Vol. 32 
