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1155 |
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Tuesday, June 03, 2008, Auditorium 2 3:35 PM Junior Session This session will deal with different topics, most promising young talents, both from industry and universities will report shortly about their work. This session is accompanied by a special poster exposition. All visitors of this session are allowed to elect their favorite contribution, the winner will be anounced on the awards banquet |
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Thin and dense yittria partially stabilzed zirconia electrolytes for IT-SOFC manufactured by suspension plasma spraying |
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Ghislain Montavon / SPCTS - UMR CNRS 6638, Faculty of Sciences, University of Limoges, France Elodie Brousse* / SPCTS-UMR CNRS 6638 - Faculty of Sciences - University of Limoges, France Pierre Fauchais/ SPCTS-UMR CNRS 6638 - Faculty of Sciences - University of Limoges, France Alain Denoirjean/ SPCTS-UMR CNRS 6638 - Faculty of Sciences - University of Limoges, France Hélène Ageorges/ SPCTS-UMR CNRS 6638 - Faculty of Sciences - University of Limoges, France Vincent Rat/ SPCTS-UMR CNRS 6638 - Faculty of Sciences - University of Limoges, France Jean-François Coudert/ SPCTS-UMR CNRS 6638 - Faculty of Sciences - University of Limoges, France Karine Wittmann-Ténèze/ LPTh - CEA centre du Ripault, France |
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Intermediate Temperature ¡V Solid Oxy-Fuel Cells (IT-SOFC) include in their design a solid electrolyte layer made of Yttria-Partially Stabilized Zirconia (Y-PSZ) or apatites acting as an ionic conductor and through which oxygen ions diffuse. This layer needs to fulfill several characteristics among which a low leakage rate corresponding to a non-connected pore network and a low level of stacking defects such as microcracks or globular pores. Moreover, the thickness of this layer needs to be as low as possible (about 10 ?Ým) in order to limit ohmic losses. Suspension Plasma Spraying (SPS) appears as a possible technological route to manufacture such layers structured as the micron or sub-micron scales. In SPS, a stabilized suspension, made of a liquid, solid particles and a dispersant, is injected within the plasma flow. The liquid is very quickly fragmented and then vaporized and the individual particles, or the particle agglomerates, depending on the average size and morphology of the solid feedstock, are heated and simultaneously accelerated towards the substrate surface where they impact, spread and solidify, analogously in a first approximation to larger particles, to form a layer. The architecture of the layer, in particular its pore network, is very closely related to plasma operating parameters (from which derive plasma flow stability), from the suspension characteristics, in particular the feedstock particle size distribution and from the suspension injection parameters. This work aims at presenting recent developments made to optimize some of these operating parameters to maximize the electrolyte layer characteristics. |