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000874008 1001_ $$0P:(DE-HGF)0$$aBack, Hyoung Chul$$b0
000874008 245__ $$aPhase Transformation-Induced Changes in Microstructure and Residual Stresses in Thermally Sprayed MnCoFeO4 Protective Coatings
000874008 260__ $$aBoston, Mass.$$bSpringer$$c2020
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000874008 520__ $$aThe contribution comprises the investigation of the microstructure and residual stresses in thermally sprayed Mn1.0Co1.9Fe0.1O4.0 (MCF) protective coatings for interconnectors of SOFC stacks, deposited on ferritic steel Crofer 22 APU via atmospheric plasma spraying (APS). The coatings are designated to prevent Cr evaporation during high operation temperature of the SOFCs. The local microstructure, pore distributions and pore shapes, phase fractions, micro-hardness, Youngs’ modulus and residual stresses through the coating thickness were characterized in as-sprayed state and compared with longtime (10-100 h) heat-treated samples (700 and 850 °C). The results show that the long-term thermal aging treatment causes a successive high sintering of the coatings characterized by a reduction in pore density, by phase transformation from the metastable rock salt structure that gradually transformed to a spinel structure and by a slight relaxation of the process-induced tensile residual stresses in the coating. For SOFC application of the MCF coating, this indicates an improvement in the coatings integrity. During operation, a self-repair proceeds leading to dense and gas-proof coatings, while the mechanical properties are mainly retained.
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000874008 7001_ $$0P:(DE-HGF)0$$aGibmeier, Jens$$b1$$eCorresponding author
000874008 7001_ $$0P:(DE-Juel1)129670$$aVaßen, Robert$$b2$$ufzj
000874008 773__ $$0PERI:(DE-600)2047715-6$$a10.1007/s11666-020-00997-9$$p1242–1255$$tJournal of thermal spray technology$$v29$$x1544-1016$$y2020
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