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Abstract

The results of a research programme sponsored by the Department of Energy and directed at establishing some of the scientific issues underpinning the development of enhanced zirconia thermal barrier coatings (TBCs) are reviewed. Our studies have established the stability ranges for both yttria stabilized and codoped zirconia coating materials and identified the mechanisms responsible for failure of current coating systems. These reveal that it is likely that present EB-PVD coatings systems are limited by the performance of current bond-coats and their oxidation behaviour, especially under thermal cycle conditions, rather than the zirconia coating material itself. These studies provide the scientific framework for the development of enhanced zirconia-based thermal barrier coating systems for advanced industrial gas turbine engine applications.

Keywords

zirconia bond-coats co-doping oxidation thermal cycling

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Enhanced zirconia thermal barrier coating systems

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