Abstract
In order to reduce the interfacial thermal stress, a novel functionally graded YSZ/Al2O3 nanocoating (YSZ/Al2O3 FGC) which is hot corrosion resistant was developed with the sols of ZrO2, Y2O3 and AlOOH in this paper. SEM and XRD analyses indicated that the YSZ/Al2O3 FGC was about 4.2 μm in thickness and composed of t′-YSZ and γ-Al2O3 nanoparticles. Hot corrosion tests showed that the YSZ/Al2O3 FGC remarkably restrained the infiltration of the molten NaVO3 salt into the YSZ substrate. A thermal shock test at 700 °C showed that the thermal shock resistance of the YSZ/Al2O3 FGC was enhanced greatly compared with that of the Al2O3 coating. The improvement of the YSZ/Al2O3 FGC in the thermal cycle lifetime could be attributed to its compositionally graded structure, which decreased the thermal stress due to the thermal expansion coefficient mismatch between the YSZ substrate and the Al2O3 coating.
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