Performance of YSZ and Gd2Zr2O7/YSZ double layer thermal barrier coatings in burner rig tests. Issue 2 (February 2020)

• Record Type: Journal Article
• Authors: Vaßen, Robert; Bakan, Emine; Mack, Daniel; Schwartz-Lückge, Sigrid; Sebold, Doris; Jung Sohn, Yoo; Zhou, Dapeng; Guillon, Olivier
• Is Part Of: Journal of the European Ceramic Society. Volume 40:Issue 2(2020)
• Page Start: 480
• Page End: 490
• Publication Date: 2020-02
• Subjects: Thermal barrier coatings -- Yttria stabilized zirconia -- Gadolinium zirconate -- Gradient testing -- Failure mechanism; Ceramic materials -- Periodicals; Composite materials -- Periodicals; Matériaux céramiques -- Périodiques; Composites -- Périodiques; Ceramic materials; Composite materials; Periodicals; Electronic journals; 666.05
• DOI: 10.1016/j.jeurceramsoc.2019.10.021
• Languages: English
• ISSNs: 0955-2219

Abstract

Abstract: Double layer thermal barrier coatings (TBCs) consisting of a Gd2 Zr2 O7 (GZO) top and an ytrria stabilized zirconia (YSZ) interlayer have been tested in a burner rig facility and the results compared to the ones of conventional YSZ single layers. In order to gain insight in the high temperature capability of the alternative TBC material, high surface temperatures of up to 1550 °C have been chosen while keeping the bond coat temperature similar. It turned out that the performance of all systems is largely depending on the microstructure of the coatings especially reduced porosity levels of GZO being detrimental. In addition, it was more difficult in GZO than in YSZ coatings to obtain highly porous and still properly bonded microstructures. Another finding was the reduced lifetime with increasing surface temperatures, the amount of reduction is depending on the investigated system. The reasons for this behavior are analyzed and discussed in detail.