Abstract
The aim of this study was the further development of dysprosia-stabilized zirconia coatings for gas turbine applications. The target for these coatings was a longer lifetime and higher insulating performance compared to today’s industrial standard thermal barrier coating. Two morphologies of ceramic top coat were studied: one using a dual-layer system and the second using a polymer to generate porosity. Evaluations were carried out using a laser flash technique to measure thermal properties. Lifetime testing was conducted using thermo-cyclic fatigue testing. Microstructure was assessed with SEM and Image analysis was used to characterize porosity content. The results show that coatings with an engineered microstructure give performance twice that of the present reference coating.
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Acknowledgments
The authors wish to thank the KK foundation for its financial support of the project. Thanks to Mr. S. Björklund for his work on the spray experiments. Thanks to Mr. J. Donoghue for his work on analysis of the samples. Thanks also to Mr. Niclas Åberg for performing TCF tests at Siemens in Finspång, Sweden.
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Curry, N., Markocsan, N., Östergren, L. et al. Evaluation of the Lifetime and Thermal Conductivity of Dysprosia-Stabilized Thermal Barrier Coating Systems. J Therm Spray Tech 22, 864–872 (2013). https://doi.org/10.1007/s11666-013-9932-9
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DOI: https://doi.org/10.1007/s11666-013-9932-9