Thermal cycling behavior of Gd 2Zr 2O 7 based thermal barrier coatings

Document Type

Conference Proceeding

Publication Date

12-1-2011

Abstract

Thermal cycling behavior of gadolinium zirconate (Gd 2Zr 2O 7, GZ) based thermal barrier coatings (TBCs) was studied in this paper, in comparison to the conventional yttria-stabilized-zirconia (YSZ) coatings. Pure GZ coatings, GZ and YSZ composite coatings, double layered GZ/YSZ coatings, and pure YSZ coatings were prepared by atmospheric plasma spraying (APS). The thermal cycling tests were conducted at 1150°C in an air furnace. Results showed that the GZ/YSZ double layer structure was the best among the tested GZ based TBCs and the delamination of GZ/YSZ coating first initiated in the GZ layer close to the interface of GZ and YSZ layers, which was mainly caused by the sintering effect of the GZ layer. The additional investigation of thermochemical compatibility of GZ and YSZ powder mixture at 1300°C showed that a solid GZ structure solution with higher ZrO 2 concentration than the stoichiometric GZ case was formed due to the ion diffusion. 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

1046

Last Page

1053

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