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000865446 020__ $$a978-3-95806-422-5
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000865446 037__ $$aFZJ-2019-04897
000865446 041__ $$aGerman
000865446 1001_ $$0P:(DE-Juel1)177920$$aGatzen, Caren Sophia$$b0$$eCorresponding author
000865446 245__ $$aEntwicklung von korrosionsstabilen Schutzschichten für oxidische Faserverbundwerkstoffe$$f - 2019-04-29
000865446 260__ $$aJülich$$bForschungszentrum Jülich GmbH Zentralbibliothek, Verlag$$c2019
000865446 300__ $$aII, 143
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000865446 3367_ $$02$$2EndNote$$aThesis
000865446 3367_ $$0PUB:(DE-HGF)11$$2PUB:(DE-HGF)$$aDissertation / PhD Thesis$$bphd$$mphd$$s1593416159_17121
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000865446 4900_ $$aSchriften des Forschungszentrums Jülich Reihe Energie & Umwelt / Energy & Environment$$v471
000865446 502__ $$aDissertation, Univ. Bochum, 2019$$bDissertation$$cUniv. Bochum$$d2019
000865446 520__ $$aDue to their high specific strength and high temperature resistance, oxide ceramic matrix composites (CMCs) are promising materials for high-temperature applications, e.g. in gas turbine combustion chambers. However, degradation due to water vapor corrosion at temperatures above 1200 °C is a serious problem. Environmental barrier coatings (EBCs) are required to prevent or minimize these reactions. The focus of this work is the development of EBCs for an alumina-based CMC, especiallythe improvement of the adhesion between coating and CMC. First, different methods of surface structuring of the CMC were investigated. The structuring by laser ablation turned out to be promising and was investigated in detail. Subsequently, YSZ, Gd$_{2}$Zr$_{2}$O$_{7}$, Y$_{2}$O$_{3}$ and YAlO$_{3}$ were selected as potential protective coatings due to their low recession rates and fitting thermal expansion coefficients. Samples of the CMC, with and without laser structuring were coated by plasma spraying. The suitability of these coating systems and their adhesion to the substrate were investigated by tensile adhesion tests and thermal cycling. Two different adhesion mechanisms were found: YSZ- and Gd$_{2}$Zr$_{2}$O$_{7}$- coatings adhere mainly by mechanically interlocking to the substrate.Structuring of the samples before coating could considerably improve the adhesion. Y$_{2}$O$_{3}$- and YAlO$_{3}$- coatings react with the Al$_{2}$O$_{3}$-based substrate to form yttrium alluminates. Due to the formation of this boundary layer, a very good adhesion was achieved, even on unstructured samples. Since the corrosion stability is also important for an EBC, selected samples were used to validate a new corrosion test procedure in which significant corrosion rates can be measured within a short time by using a HVOF torch.
000865446 536__ $$0G:(DE-HGF)POF3-113$$a113 - Methods and Concepts for Material Development (POF3-113)$$cPOF3-113$$fPOF III$$x0
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000865446 9141_ $$y2019
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