Abstract
The hot corrosion behavior of plasma-sprayed ceria–yttria co-stabilized zirconia (CYSZ) nanostructured coatings (with the chemical composition of ZrO2–2.5wt%Y2O3–25wt%CeO2) was studied in the presence of 45wt% Na2SO4+55wt%V2O5 as the corrosive molten salts, for 6, 12, 18, 30, 72, 156, and 300h at 1000°C. As the hot corrosion products, YVO4, CeVO4 and Ce0.75O2Zr0.25 crystals were formed by leaching Y2O3 and CeO2 from CYSZ due to the reaction between the corrosive salts and (Y2O3, CeO2) stabilizers of zirconia. The CYSZ nanostructured coating showed remarkable resistance to degradation throughout the hot corrosion test, irrespective of an additional reaction with the corrosive salts. A mechanism was suggested based on the prohibition of the further diffusion of molten salts into the deeper layers of the coating, via diffusional resistance in the nanoporous media.
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