000890451 001__ 890451
000890451 005__ 20240711085652.0
000890451 0247_ $$2Handle$$a2128/27210
000890451 0247_ $$2ISSN$$a1866-1793
000890451 020__ $$a978-3-95806-524-6
000890451 037__ $$aFZJ-2021-00967
000890451 041__ $$aGerman
000890451 1001_ $$0P:(DE-Juel1)173939$$aWolf, Markus$$b0$$eCorresponding author$$gmale$$ufzj
000890451 245__ $$aEntwicklung von Schutzschichten für nicht-oxidische Faserverbundwerkstoffe$$f- 2020-12-14
000890451 260__ $$aJülich$$bForschungszentrum Jülich GmbH Zentralbibliothek, Verlag$$c2021
000890451 300__ $$aVI, 150, 2 S.
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000890451 3367_ $$2BibTeX$$aPHDTHESIS
000890451 3367_ $$02$$2EndNote$$aThesis
000890451 3367_ $$0PUB:(DE-HGF)11$$2PUB:(DE-HGF)$$aDissertation / PhD Thesis$$bphd$$mphd$$s1613746260_13130
000890451 3367_ $$2DRIVER$$adoctoralThesis
000890451 4900_ $$aSchriften des Forschungszentrums Jülich. Reihe Energie & Umwelt / Energy & Environment$$v528
000890451 502__ $$aUniversität Bochum, Diss., 2020$$bDr.$$cUniversität Bochum$$d2020
000890451 520__ $$aThe non-oxide ceramic matrix composites (CMCs), which exhibit good mechanical high-temperature properties and low density, represent a promising alternative to the temperature-limited metallic materials. However, a problem with these CMCs is their high susceptibility to corrosion in an atmosphere containing water vapor at temperatures above 1200°C. In order to protect the material from the influence of corrosive media, various protective coating systems (environmental barrier coatings, EBCs) are applied to the CMC. The aim of the work described here is to develop a coating system that protects the base material from corrosive atmospheres in cooperation with an industrial partner. The focus of the present work is on the manufacture and optimization of EBCs for the protection of silicon carbide-based CMCs. In a first step, different material candidates have been investigated for their thermal, thermomechanical, and mechanical properties to evaluate an optimal EBC candidate. In particular, the corrosion resistance against calcium-magnesium-aluminum-silicates (CMAS) has been considered. Subsequently, the best evaluated materials Yb$_{2}$Si$_{2}$O$_{7}$ and a mixture of Yb$_{2}$Si$_{2}$O$_{7}$ and Yb$_{2}$SiO$_{5}$ were applied to the CMC using different thermal spray processes. These two materials show a high corrosion protection against CMAS and coefficients of thermal expansion adapted to the CMC. Below the top layers of these two materials, the CMC is additionally coated with a silicon bond coat to create a complete EBC layer system. By varying the process parameters, it was possible to design the top layers in such a way that they were very dense, crackfree and crystalline at the same time. The layers developed with the different processes were subjected to evaluate the thermal shock resistance during thermal cycling and compared to each other. In addition to the material study and the optimization of layer deposition, the surface of the bond coat was structured with a laser to increase the adhesion of the top layer to the bond coat. In this way, the lifetime of the coatings was further increased. The effect of this structuring has been verified by means of an adapted test of interfacial toughness. It turned out that the interfacial toughness could be increased by 70% by means of the added structure. However, it was also found that the test methodology needs to be optimized, since the observed crack did not continuously follow the interface to be tested. In a final test series, the deposition of a Silicon-Yb$_{2}$Si$_{2}$O$_{7}$ layer system was transferred from flat substrates to a 3D substrate in the form of a turbine blade edge.
000890451 536__ $$0G:(DE-HGF)POF4-124$$a124 - Hochtemperaturtechnologien (POF4-124)$$cPOF4-124$$fPOF IV$$x0
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000890451 9141_ $$y2021
000890451 9101_ $$0I:(DE-588b)5008462-8$$6P:(DE-Juel1)173939$$aForschungszentrum Jülich$$b0$$kFZJ
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000890451 9131_ $$0G:(DE-HGF)POF4-124$$1G:(DE-HGF)POF4-120$$2G:(DE-HGF)POF4-100$$3G:(DE-HGF)POF4$$4G:(DE-HGF)POF$$aDE-HGF$$bForschungsbereich Energie$$lMaterialien und Technologien für die Energiewende (MTET)$$vHochtemperaturtechnologien$$x0
000890451 920__ $$lyes
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