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1198 |
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Monday, June 02, 2008, Auditorium 2 3:40 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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Suspension thermal spraying of reduced temperature solid oxide fuel cell (SOFC) components |
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Jörg Oberste Berghaus* / Instituts des matériaux industriels | Industrial Materials Institute
Conseil national de recherche | National Research Council canada
Gouvernement du canada | Governement of Canada
, Canada Jean-Gabriel Legoux / Industrial Materials Institute, NRC-CNRC, , Canada Christian Moreau/ Industrial Materials Institute, NRC-CNRC, Canada Rob Hui/ Institute for Fuel Cell Innovation, NRC-CNRC, , Canada Radenka Maric/ Institute for Fuel Cell Innovation, NRC-CNRC, , Canada |
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SOFC half-cells, consisting of porous NiO-SDC (nickel oxide-samarium doped ceria) anode sublayers and thin SDC electrolytes were fabricated. The layers were consecutively deposited onto porous metallic interconnects by suspension thermal spraying, using standard industrial thermal spray equipment. The liquid carrier employed in this approach allows for controlled feeding of much finer particles than in conventional thermal spraying, leading to thin coatings with refined microstructure. The superior ionic conductivity of ceria-based ceramics over conventional zirconia-based SOFC materials has generated considerable interest in developing cost-effective techniques for producing those layers. As compared to zirconia, however, ceria is generally more difficult to process due to its higher melting point, lower strength and possible decomposition and evaporation during thermal spraying. Suspension spraying was implemented for a number of different spray systems. Some novel approachs were found promising in limiting material decomposition, enhancing deposition efficiency and reducing defect density in the resulting coating. The effect of process parameters on the in-flight particle temperature and velocity are discussed and coating produced from different spay systems are compared. Selected electrochemical properties of the coatings are presented. |