Degradation of the TBC system during the static oxidation test

This study was done on the IN-738 type alloy with thermal barrier coatings. On the basic surface of the NiCoCrAlY superalloy, VPS-sprayed powder was applied as the bond-coat. In addition, ZrO₂x 8%Y₂O₃ powder was used for a deposition outside the top surface of a ceramic layer by the APS method. Appr...

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Bibliographic Details
Published in:Journal of microscopy (Oxford) 2010-03, Vol.237 (3), p.450-455
Main Authors: MOSKAL, G, SWADŹBA, L, MENDALA, B, GÓRAL, M, HETMAŃCZYK, M
Format: Article
Language:English
Subjects:
Degradation
oxidation
TBC
TGO
YSZ
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Summary:This study was done on the IN-738 type alloy with thermal barrier coatings. On the basic surface of the NiCoCrAlY superalloy, VPS-sprayed powder was applied as the bond-coat. In addition, ZrO₂x 8%Y₂O₃ powder was used for a deposition outside the top surface of a ceramic layer by the APS method. Appropriate control of the spraying process parameters permitted to obtain a gradient of porosity on the thickness of the ceramic coating. Then a static oxidation test at 1100°C and for 1100 h was performed. The basic conclusions of that testing showed that main degradation modes of the gradient thermal barrier coating system were connected with formation of porous NiAl₂O₄ oxides in the thermally grown oxide area and, consequently, formation of micro-cracks, delamination of a ceramic layer and final spallation of a ceramic top-coat.
ISSN:0022-2720
1365-2818
DOI:10.1111/j.1365-2818.2009.03290.x