000848365 001__ 848365
000848365 005__ 20240711085612.0
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000848365 0247_ $$2ISSN$$a1866-1793
000848365 020__ $$a978-3-95806-327-3
000848365 037__ $$aFZJ-2018-03606
000848365 041__ $$aGerman
000848365 1001_ $$0P:(DE-Juel1)165868$$aGrünwald, Nikolas$$b0$$eCorresponding author$$gmale$$ufzj
000848365 245__ $$aSelbstheilende plasmagespritzte Mn$_{1,0}$Co$_{1,9}$Fe$_{0,1}$O$_{4}$-Schutzschichten in Festoxidbrennstoffzellen$$f- 2018-05-09
000848365 260__ $$aJülich$$bForschungszentrum Jülich GmbH Zentralbibliothek, Verlag$$c2018
000848365 300__ $$ax, 140 S.
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000848365 3367_ $$02$$2EndNote$$aThesis
000848365 3367_ $$0PUB:(DE-HGF)11$$2PUB:(DE-HGF)$$aDissertation / PhD Thesis$$bphd$$mphd$$s1530257332_14342
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000848365 4900_ $$aSchriften des Forschungszentrums Jülich Reihe Energie & Umwelt / Energy & Environment$$v422
000848365 502__ $$aUniversität Bochum, Diss., 2018$$bDissertation$$cUniversität Bochum$$d2018
000848365 520__ $$aApplying dense chromium protective layers between interconnector and cathode can efficientlydiminish chromium related degradation of solid oxide fuel cells (SOFCs). Especiallyatmospherically plasma sprayed (APS) Mn$_{1.0}$Co$_{1.9}$Fe$_{0.1}$O$_{4}$ (MCF) coatings demonstrated their effectiveness concerning Cr retention within stacks tested in Jülich. Nevertheless, strong microstructural and phase changes of these coatings during operation were reported in literature, but not fully understood yet. This thesis was part of a collaborative project called “SOFC-Degradation” (grant no.03SF0494A), which was focused on different degradation phenomena emerging during SOFC operation. The goal of the present work was to investigate the basic mechanisms leading to the observed changes of APS-MCF coatings during operation. The results should enable long-term prediction and facilitate accelerated test-procedures. Additionally, wet powder spraying (WPS) was investigated as a cost efficient alternate coating technique. APS-MCF coatings were heat treated in air in combination with common steel substrates and cathode contact layers to simulate SOFC operation conditions. During the APS-process MCF is reduced and deposited in a rock salt configuration ((Mn,Co,Fe)$_{1}$O$_{1}$), which is metastable at room temperature. By annealing these coatings in air, the material transforms to the low temperature (T < 1100 °C) stable spinel phase ((Mn,Co,Fe)$_{3}$O$_{4}$). This phase transformation is connected to an oxygen uptake and is accompanied by a volume expansion of the material. Inside the crack-network that can be found in as-sprayed coatings, this volume expansion leads to a densification and crack-healing. Subsequently, the phase transformation, which is also anoxidation process, is dominated by solid state diffusion of cations as soon as the cracks areclosed. Thereby cobalt is enriched at the layer’s surface as its diffusion coefficient is higher than that of manganese or iron within the layer formed. The outward diffusion of cations generates a counterflow of vacancies into the bulk, where they accumulate to form small pores. A two-phase-system composed of a cobalt-rich rock salt phase and a manganese- and iron-rich spinel phase can be observed in the coating’s bulk. Extending the annealing time results in a decrease of rock salt phase and an increase of spinel phase. When the transformation to the spinel phase is completed, solid state diffusion strives for a homogeneous distribution of elements on the long term. An increase of the annealing temperature accelerates the observed phenomena. [...]
000848365 536__ $$0G:(DE-HGF)POF3-113$$a113 - Methods and Concepts for Material Development (POF3-113)$$cPOF3-113$$fPOF III$$x0
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000848365 9141_ $$y2018
000848365 9101_ $$0I:(DE-588b)5008462-8$$6P:(DE-Juel1)165868$$aForschungszentrum Jülich$$b0$$kFZJ
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