Preparation and characteristics of three-layer YSZ-(YSZ/Al2O3)-YSZ TBCs |
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Authors: | C RenYD He DR Wang |
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Institution: | Beijing Key Laboratory for Corrosion, Erosion and Surface Technology, University of Science and Technology Beijing, China |
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Abstract: | Novel three-layer YSZ-(YSZ/Al2O3)-YSZ (6 wt.% Y2O3 partially stabilized ZrO2) thermal barrier coatings (TBCs) were successfully prepared on Ni-based superalloy substrate using composite sol-gel and pressure filtration microwave sintering (PFMS) techniques. The coatings were evaluated for the cyclic oxidation resistance, thermal barrier effect and the presences of phases and microstructures. FE-SEM results indicate that the coatings were dense and crack-free. The coatings maintained their structural integrity when they were exposed at 1100 for 100 h. They exhibited superior oxidation resistance, spallation resistance and thermal insulation property compared with single-layer YSZ coatings. Moreover, the detailed mechanisms were discussed in order to understand the improved performance of the three-layer TBCs. |
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Keywords: | Laminated TBCs Composite sol-gel Cyclic oxidation resistance Spallation resistance Thermal barrier effect |
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