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

✍ Scribed by P.-Y. Théry; M. Poulain; M. Dupeux; M. Braccini

• Publisher: Elsevier Science
• Year: 2007
• Tongue: English
• Weight: 999 KB
• Volume: 202
• Category: Article
• ISSN: 0257-8972
• DOI: 10.1016/j.surfcoat.2007.06.014

✦ Synopsis

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.%Y 2 O 3 -ZrO 2 ) EB-PVD ceramic top coat deposited on a single-crystal AM1 superalloy substrate protected with either a β-(Ni, Pt)Al bond coat or a newly developed Zr-doped β-NiAl bond coat. Although the results show a similar adhesion evolution for both systems, different microstructural degradations are involved.