Adhesion energy of a YPSZ EB-PVD layer in two thermal barrier coating systems

[摘要] In order to understand the degradation of thermal barrier coating (TBC) systems better, we determined the adhesion energy (G(c)) between the bond coat and the top coat and its evolution during cyclic oxidation. This energy was evaluated by means of a modified four-point bending test. The systems tested consist of a YPSZ (7 wt.%Y2O3-ZrO2) EB-PVD ceramic top coat deposited on a single-crystal AM1 superalloy substrate protected with either a beta-(Ni, Pt)Al bond coat or a newly developed Zr-doped beta-NiAl bond coat. Although the results show a similar adhesion evolution for both systems, different microstructural degradations are involved. (c) 2007 Elsevier B.V. All rights reserved.

[发布日期] 2007-12-15

[效力级别]  Proceedings Paper

[关键词] thermal barrier coatings;adhesion testing;cyclic oxidation;rumpling;failure mechanisms;Photo-stimulated Luminescence Piezo-Spectroscopy (PLPS)