In order to improve the hot corrosion resistance of yttria‐stabilized zirconia (YSZ), an Al 2 O 3 overlay has been deposited on the surface of YSZ by electron‐beam physical vapor deposition. Hot corrosion tests have been performed on the YSZ coatings with and without an Al 2 O 3 overlay in the molten salt mixture (Na 2 SO 4 +0–15 wt% V 2 O 5 ) at 950°C. The presence of V 2 O 5 in the molten salt exacerbates degradation of both the monolithic YSZ coating and the composite YSZ/Al 2 O 3 system. The formation of a low‐melting Na 2 O–V 2 O 5 –Al 2 O 3 liquid phase is responsible for degradation of the Al 2 O 3 overlay. The Al 2 O 3 overlay acts as a barrier against the infiltration of the molten salt into the YSZ coating during exposure to the molten salt mixture with <5 wt% vanadate.
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Wu et al. (2005) studied this question.
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