Tailoring the ceria SDB coating: compatibility with the slurry
Fig. 1a shows a macrograph of the ceria-coated model nickel
substrate in the as-deposited conditions after drying. At the naked
eye, the deposit exhibits a white colour accounting for Ce(OH)3
formation [21] and fully covers the surface of the substrate. Characterization
by SEM (Fig.1b) also indicates that the deposit presents
a network of relatively thin cracks that develop during the thickening
of the layers [20] and is expected to favour the Al enrichment
by offering preferential diffusion pathways with the substrate. After
application of the slurry on the interlayer by air spraying, the
coverage appears to be homogeneous (Fig. 1c).