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1341 |
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Monday, June 02, 2008, Auditorium 2 5:00 PM Solid Oxide Fuel Cell 2 Coatings for SOFC components for mobile and stationary applications, thermal and electrical insulation by thermal sprayed ceramic coatings |
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Solid oxide fuel cells produced with suspensions and conventional plasma spray processes |
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Olivier Marchand* / LERMPS/UTBM, France Régine Rampon/ LERMPS/UTBM, France Ghislaine Bertrand/ LERMPS/UTBM, France |
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In order to achieve SOFC with reduced costs, the atmospheric plasma spray process (APS) could be an attractive technique. However, it is difficult to produce plasma sprayed coatings with the appropriate porosity for the electrodes and full density for the electrolyte. The spray process has been adapted by providing a suspension or a powder as feedstock material combined with optimized spray conditions to manufacture SOFC layers with required compositions, microstructures and properties. Suspensions or powders were injected in a plasma jet originating from a conventional torch (F4) implementing external devices. Aqueous suspensions of yttria stabilized zirconia (YSZ) powders have been prepared to achieve a dense and fine (10 ìm) layer as electrolyte. By using optimized suspensions of nickel oxide (NiO) and YSZ in ethanol, porous anodes have been produced with thicknesses around 50 ìm. Finally the porous cathode layers based on lanthanum strontium manganite (La0.8Sr0.2MnO3 or LSM) have been manufactured by conventional atmospheric plasma spraying of powders. The influence of various plasma parameters and different feedstocks on the layers morphology is discussed and examples of complete cells behaviours are given. |