Application of Suspension Plasma Spraying (SPS) for Manufacture of Ceramic Coatings |
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Authors: | Holger Kassner Roberto Siegert Dag Hathiramani Robert Vassen Detlev Stoever |
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Affiliation: | (1) IEF-1, Forschungszentrum Jülich GmbH, Juelich, Germany |
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Abstract: | Conventional thermal spray processes as atmospheric plasma spraying (APS) have to use easily flowable powders with a size
up to 100 μm. This leads to certain limitations in the achievable microstructural features. Suspension plasma spraying (SPS)
is a new promising processing method which employs suspensions of sub-micrometer particles as feedstock. Therefore much finer
grain and pore sizes as well as dense and also thin ceramic coatings can be achieved. Highly porous coatings with fine pore
sizes are needed as electrodes in solid-oxide fuel cells. Cathodes made of LaSrMn perovskites have been produced by the SPS
process. Their microstructural and electrochemical properties will be presented. Another interesting application is thermal
barrier coating (TBC). SPS allows the manufacture of high-segmented TBCs with still relatively high porosity levels. In addition
to these specific applications also the manufactures of new microstructures like nano-multilayers and columnar structures
are presented. |
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Keywords: | coatings for gas turbine components fuel cells nanostructured materials new structures segmented coatings suspension plasma spraying |
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