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Liquid Plasma Sprayed Coatings of Yttria-Stabilized Zirconia for SOFC Electrolytes

Domenii publicaţii > Stiinte ingineresti + Tipuri publicaţii > Articol în revistã ştiinţificã

Autori: Rampon, R.; Toma, F.L.; Bertrand, G.; Coddet, C.

Editorial: Journal of Thermal Spray Technology, 15 (4), p.682-688, 2006.

Rezumat:

To achieve solid oxide fuel cells (SOFC) at reduced costs, the atmospheric plasma spray (APS) process could be an attractive technique. However, to make dense and thin layers as needed for electrolytes, a suspension is preferably implemented as a feedstock material instead of a conventional powder. Suspensions of yttria-stabilized zirconia particles in methanol have been prepared with various solid loadings and states of dispersion. An external injection system was used to ensure the atomization and radial injection of the suspension into the Ar-H2 plasma under atmospheric conditions. The coatings morphologies were characterized by scanning electron microscopy, and their porosity was evaluated by the Archimedes method. Differences in the microstructure of the deposits were observed depending on the APS operating conditions. Special attention has been dedicated to assess the influence of the suspension as well as the injection on the layer morphology. For this purpose, the atomization has been investigated and efforts have been made to understand relationships among suspension properties, atomization, and coating microstructure.

Cuvinte cheie: liquid suspension spraying, SOFC, YSZ