Enhanced properties of Al-modified EB-PVD 7YSZ thermal barrier coatings |
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| Affiliation: | 1. University of Roma Tre, Via Della Vasca Navale 79, Rome 00146, Italy;2. German Aerospace Center (DLR), Linder Hoehe, Cologne 51147, Germany;1. Department of Engineering Science, University West, Sweden;2. Treibacher Industrie AG, Austria;1. School of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China;2. Institute of New Materials, Guangzhou Research Institute of Non-ferrous Metals, Guangzhou 510650, China |
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| Abstract: | 7 wt% yttria-stabilized zirconia (7YSZ) thermal barrier coating (TBC) prepared by electron beam-physical vapor deposition (EB-PVD) has been used in gas turbine engines for many years, where the TBC must successfully withstands the damage caused by a variety of environmental and mechanical aspects. The primary failure modes for TBC are oxidation of bond coating, particle erosion and CMAS (calcium-magnesium-alumina-silicates) corrosion. The lifetime of TBC associated with above three failure factors will be reduced significantly. In order to prolong the operation time, an alternative approach depositing Al film on 7YSZ TBC surface by magnetron sputtering is proposed. An α-Al2O3 overlay was in-situ synthesized on each 7YSZ column through reaction of Al and ZrO2 during vacuum heat treatment. And the results indicate that the Al-modified EB-PVD 7YSZ TBC shows better oxidation resistance, as well as lower particulate erosion and CMAS corrosion. |
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| Keywords: | Thermal barrier coating EB-PVD Al modification In-situ synthesis |
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