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Deposition of La1−x Sr x Fe1−y Co y O3−δ Coatings with Different Phase Compositions and Microstructures by Low-Pressure Plasma Spraying-Thin Film (LPPS-TF) Processes

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Abstract

Perovskite-type materials with the general chemical formula A1−x A′ x B1−y B′ y O3−δ have received considerable attention as candidates for oxygen separation membranes. Preparation of La1−x Sr x Fe1−y Co y O3−δ (LSFC) coatings by low-pressure plasma spraying-thin film processes using different plasma spray parameters is reported and discussed. Deposition with Ar-He plasma leads to formation of coatings containing a mixture of cubic LSFC perovskite, SrLaFeO4, FeCo, and metal oxides. Coatings deposited at higher oxygen partial pressures by pumping oxygen into the vacuum chamber contain more than 85% perovskite and only a few percent Fe3−x Co x O4, and/or CoO. The microstructures of the investigated LSFC coatings depend sensitively on the oxygen partial pressure, the substrate temperature, the plasma jet velocities, and the deposition rate. Coatings deposited with Ar-rich plasma, relatively low net torch power, and with higher plasma jet velocities are most promising for applications as oxygen permeation membranes.

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Acknowledgments

The research leading to these results has received funding from the European Community’s Seventh Framework Programme, FP7/2007-2013, under grant agreement no. 241309.

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Zotov, N., Hospach, A., Mauer, G. et al. Deposition of La1−x Sr x Fe1−y Co y O3−δ Coatings with Different Phase Compositions and Microstructures by Low-Pressure Plasma Spraying-Thin Film (LPPS-TF) Processes. J Therm Spray Tech 21, 441–447 (2012). https://doi.org/10.1007/s11666-012-9768-8

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  • DOI: https://doi.org/10.1007/s11666-012-9768-8

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