Abstract
In this study, thick ceramic coatings were fabricated by laser multi-layer cladding with Al2O3-13%TiO2nanostructured agglomerated powders based on series of crack control of clad layer. The microstructural characteristics and microhardness of the coating were investigated by using scanning electron microscopy (SEM) and microhardness measurement. The results show that the laser-clad thick ceramic coating has no obvious interface between the layers with dense, continuous structure, and almost no pores and free of large penetrating cracks. The ceramic layer is composed of fully melted regions (fine equiaxed grains) and partially melted regions (remained nanoparticles). In addition, the most microcracks in the coating are focus on the partially melted region. The grain size of ceramic coating in the depth direction is gradually increased, while the hardness along depth direction is gradually decreased.
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