This pattern confirms the formation of in situ Al2O3-YSZ composite with the thickness of about 45 mm on the top of the sprayed YSZ. This composite probably is formed due to the partial melting of the YSZ layer and mixing with molten alumina during laser cladding. To prove formation of the Al2O3/ZrO2 composite layer, Grazing Incidence X-ray Diffraction was utilized (Fig. 4-c).