Evolution of hot corrosion resistance of YSZ and Gd 2Zr 2O 7 thermal barrier coatings in Na 2SO 4+V 2O 5 at 1050°C

Document Type

Conference Proceeding

Publication Date

12-1-2011

Abstract

This paper compares the hot corrosion performance of yttria stabilized zirconia (YSZ) and Gd 2Zr 2O 7 coatings in the presence of molten mixture of Na 2SO 4+V 2O 5 at 1050°C. These YSZ and rare earth zirconate coatings were prepared by air plasma spray (APS). Chemical interaction is found to be the major corrosive mechanism for the deterioration of these coatings. Characterizations using X-ray diffraction (XRD) and scanning electron microscope (SEM) indicate that in the case of YSZ, the reaction between NaVO 3 and Y 2O 3 produces YVO 4 and leads to the transformation of tetragonal ZrO 2 to monoclinic ZrO 2. Molten salt is also found to react with Gd 2Zr 2O 7 to form GdVO 4. Comparing to YSZ, under a high temperature of 1050°C, Gd 2Zr 2O 7 is more stable, both thermally and chemically, than YSZ, and exhibits a better hot corrosion resistance. Copyright © 2011 MS&T'11®.

Publication Source (Journal or Book title)

Materials Science and Technology Conference and Exhibition 2011, MS and T'11

First Page

1684

Last Page

1693

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