Recent Developments in the Field of Thermal Barrier Coatings |
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Authors: | Robert Vassen Alexandra Stuke Detlev Stöver |
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Affiliation: | (1) Institute of Energy Research (IEF-1), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany |
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Abstract: | Conventional thermal barrier coating (TBC) systems consist of a duplex structure with a metallic bondcoat and a ceramic, heat-isolative
topcoat. Several recent research activities are concentrating on developing improved bondcoat or topcoat materials; for the
topcoat especially, those with reduced thermal conductivity are investigated. Using advanced topcoat materials, the ceramic
coating can be further divided into layers with different functions. One example is the double-layer system in which conventional
yttria-stabilized zirconia (YSZ) is used as bottom and new materials such as pyrochlores or perovskites are used as topcoat
layers. These systems demonstrated an improved temperature capability compared to standard YSZ. In addition, new functions
are introduced within the TBCs. These can be sensorial properties that can be used for an improved temperature control or
even for monitoring remaining lifetime. Further increased application temperatures will also lead to efforts for a further
improvement of the reflectivity of the coatings to reduce the radiative heat transfer through the TBC. |
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Keywords: | ceramic top coats gas turbines multifunctional coatings plasma spraying thermal barrier coating |
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