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7334 |
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Friday, May 06, 2022, Hall D 2:40 PM Suspension Spraying II |
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Performance of suspension sprayed YSZ thermal barrier coatings on INCONEL®718 substrates produced by laser powder bed fusion |
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Filofteia-Laura Toma* / Fraunhofer IWS, Germany Samira Gruber / Fraunhofer Institute for Material and Beam Technology (IWS), Germany Oliver Kunze/ Fraunhofer Institute for Material and Beam Technology (IWS), Germany Alex Selbmann/ Fraunhofer Institute for Material and Beam Technology (IWS), Germany Christoph Leyens/ Fraunhofer Institute for Material and Beam Technology (IWS), Germany Serhii Tkachenko/ Brno University of Technology, CEITEC, Czech Republic Karel Zábransky/ Brno University of Technology, CEITEC, Czech Republic Ladislav Celko/ Brno University of Technology, CEITEC, Czech Republic Tim Dorau/ Technische Universität Dresden, Institute of Aerospace Engineering, Germany |
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Additive Manufacturing techniques offer geometrical freedom to design complex shaped parts that can-not be manufactured utilizing conventional processes. This leads to new applications in several industries including aerospace propulsion systems where the material must withstand high operating temperatures. Complex internal cooling channels and ceramic YSZ thermal barrier coatings on the hot surface decrease the temperature to which the Ni-superalloy base material is exposed in an aerospike rocket engine. In this contribution, the influence of heat treatment and surface conditioning of the additively manufac-tured (AM) INCONEL®718 substrates on the thermocycling performance of water- and ethanol-based YSZ suspension sprayed coatings was investigated. The different surface conditions included as-built, sand-blasted and milled substrates. The heat treatment states involved both, i.e. not heat treated and solution annealing states. Furnace cycle oxidation (FCT) test was performed at the temperatures of 1100°C, 1300 °C, and 1500 °C until the coating systems failure. The microstructures of the samples were characterized prior and after the thermal cycling. Performance of the coatings was influenced by the state of the AM substrates, coating morphology and FCT test conditions. Columnar-like YSZ suspension plasma sprayed coatings on AM INCONEL® 718 substrates seemed to be promising candidates for rocket engine applica-tions. |