Abstract
Nanostructured yttria zirconia coatings were deposited by air plasma spraying process with agglomerated yttria partially stabilised zirconia (ZrO2-6.8%Y2O3) powder. Field emission scanning electron Microscope, scanning electronic microscopy, transmission electron microscopy and X-ray diffraction were applied to analyse the phase composition and microstructure of the nanostructured powders and coating. The results showed that the agglomerated powders and as-sprayed nanostructured coating were both consisted of tetragonal phase; No monoclinic phase were observed in the coating .The average grain size of the powders and coating were 23 and 45 nm, respectively. The coating presented three kinds of microstructures, columnar grains, equiaxed grains and non-molten particles.
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