Evaluation of the Lifetime and Thermal Conductivity of Dysprosia-Stabilized Thermal Barrier Coating Systems |
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Authors: | Nicholas Curry Nicolaie Markocsan Lars Östergren Xin-Hai Li Mitch Dorfman |
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Affiliation: | 1. University West, Trollh?ttan, Sweden 2. GKN Aerospace Engine Systems, Trollh?ttan, Sweden 3. Siemens Industrial Turbomachinery AB, Finsp?ng, Sweden 4. Sulzer Metco, Westbury, NY, USA
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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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