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1251 |
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Monday, June 02, 2008, Auditorium 2 4:40 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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Effect of substrate and cathode parameters on the properties of suspension plasma sprayed solid oxide fuel cell electrolytes |
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David Waldbillig* / Department of Materials Engineering, University of British Columbia, Canada Olivera Kesler / University of Toronto / Department of Mechanical and Industrial Engineering, Canada Zhaolin Tang/ Northwest Mettech Corp., Canada Alan Burgess/ Northwest Mettech Corp., Canada |
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Suspension plasma spraying is a promising technique for the production of coatings with fine microstructures and controlled porosity. These properties, combined with plasma spraying?s ability to produce layers rapidly without requiring a post-deposition heat treatment, make this an interesting new manufacturing method to produce solid oxide fuel cell (SOFC) active layers. However, the need to build up a number of different plasma sprayed SOFC functional layers (cathode, electrolyte and anode) sequentially on top of each other requires consideration of the influence of the substrate and previously-deposited coating layers on subsequent coating layer properties. This study uses an axial injection suspension plasma spray system to produce layers of fully stabilized yttria-stabilized zirconia (YSZ) that could be used as an SOFC electrolyte. YSZ layers were deposited on top of plasma sprayed composite lanthanum strontium manganite (LSM)/YSZ cathode layers that were first deposited on porous ferritic stainless steel substrates. Three layer half cells consisting of the porous steel substrate, composite cathode, and suspension plasma sprayed electrolyte layer were then characterized to determine the quality of the coatings. A systematic study was performed in order to investigate the effect of parameters such as substrate and cathode layer roughness, substrate surface pore size, and cathode microstructure and thickness on parameters including electrolyte deposition efficiency, leak rate, layer adhesion and microstructure. |