ISSN:
1551-2916
Source:
Blackwell Publishing Journal Backfiles 1879-2005
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
In order to improve the hot corrosion resistance of yttria-stabilized zirconia (YSZ), an Al2O3 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 Al2O3 overlay in the molten salt mixture (Na2SO4+0–15 wt% V2O5) at 950°C. The presence of V2O5 in the molten salt exacerbates degradation of both the monolithic YSZ coating and the composite YSZ/Al2O3 system. The formation of a low-melting Na2O–V2O5–Al2O3 liquid phase is responsible for degradation of the Al2O3 overlay. The Al2O3 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1111/j.1551-2916.2005.00120.x
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