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000851466 1001_ $$0P:(DE-Juel1)165868$$aGrünwald, Nikolas$$b0$$eCorresponding author
000851466 245__ $$aMicrostructure and Phase Evolution of Atmospheric Plasma Sprayed Mn-Co-Fe Oxide Protection Layers for Solid Oxide Fuel Cells
000851466 260__ $$aAmsterdam [u.a.]$$bElsevier Science$$c2019
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000851466 520__ $$aDense protective layers are needed to reduce chromium-related degradation in SOFC stacks. In particular, atmospheric plasma sprayed (APS) Mn1.0Co1.9Fe0.1O4 (MCF) coatings demonstrated low degradation rates in stack tests. We show that short-term annealing in air induces crack healing within these coatings. Parallel to this effect, a phase transformation is observed originating from oxidation that proceeds by solid state-diffusion. The present contribution reveals the basic mechanisms of the microstructural and phase changes of coatings in long-term annealing tests of up to 10,000 h at 700 °C. The layer develops differently at the air-facing surface and in the bulk. Due to cation deficiency, oxidation is dominated by cation outward diffusion, leading to a Co-enriched surface layer. The bulk displays a fine distribution of the initial (rock salt) and the final (spinel) phases. Understanding the mechanisms leading to these irreversible changes enables predictions to be made concerning durable protectivecoatings in SOFCs.
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000851466 7001_ $$0P:(DE-Juel1)159368$$aSohn, Yoo Jung$$b1$$ufzj
000851466 7001_ $$0P:(DE-Juel1)166023$$aYin, Xiaoyan$$b2$$ufzj
000851466 7001_ $$0P:(DE-Juel1)129636$$aMenzler, Norbert H.$$b3
000851466 7001_ $$0P:(DE-Juel1)161591$$aGuillon, Olivier$$b4$$ufzj
000851466 7001_ $$0P:(DE-Juel1)129670$$aVaßen, Robert$$b5
000851466 773__ $$0PERI:(DE-600)2013983-4$$a10.1016/j.jeurceramsoc.2018.08.027$$gp. S0955221918305235$$p449-460$$tJournal of the European Ceramic Society$$v39$$x0955-2219$$y2019
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