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

Document Type

Conference Proceeding

Publication Date

12-1-2011

Abstract

Thermal barrier coatings (TBCs) are frequently used on hot section components in gas turbines. Corrosive gases coming from the combustion of low grade fuels may penetrate deeply into the coating and lead to the hot corrosion degradation of the coating. This paper investigates the hot corrosion resistance of a conventional yttria-stabilized zirconia (YSZ) coating and a YSZ+Gd 2Zr 2O 7 composite coating, in Na 2SO 4+V 2O 5 at 1050°C For the conventional YSZ coating, the YSZ reacts with V 2O 5 to form rod-type YVO 4 crystals during the exposure to the molten salt, leading to the formation of monoclinic phase of ZrO 2. For the Gd 2Zr 2O 7+YSZ composite coating, by the formation of GdVO 4, the amount of YVO 4 formed on the YSZ+Gd 2Zr 2O 7 composite coating is significantly reduced, thus the amount of monoclinic phase in the TBC coating is substantially reduced, which renders YSZ+Gd 2Zr 2O 7 composite coating a better hot corrosion resistance than that of YSZ. 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

1115

Last Page

1124

This document is currently not available here.

Share

COinS