Process of making ceria-based electrolyte coating

Details Process of making ceria-based electrolyte coating Process of making ceria-based electrolyte coating

C - Chemistry, Metallurgy

23

C

C23C 18/08 (2006.01) B01D 1/16 (2006.01) B01J 2/02 (2006.01) B01J 23/10 (2006.01) B05D 1/02 (2006.01) B05D 1/04 (2006.01) B05D 1/06 (2006.01) B05D 1/08 (2006.01) B05D 1/10 (2006.01) B05D 3/08 (2006.01) B05D 5/12 (2006.01) B22F 9/16 (2006.01) B22F 9/18 (2006.01) B22F 9/24 (2006.01) C01B 13/34 (2006.01) C01F 17/00 (2006.01) C23C 4/04 (2006.01) C23C 4/10 (2006.01) C23C 4/12 (2006.01) H01B 1/06 (2006.01) H01B 1/08 (2006.01) H01M 4/04 (2006.01) H01M 4/86 (2006.01) H01M 4/88 (2006.01) H01M 8/10 (2006.01) H01M 8/1

Patent

CA 2715770

It has been surprisingly found that injecting ceria-based particles (mean size less than 200nm) suspended in a combustible organic solvent into a plume having a maximum temperature between about 2,600°C and 4,000°C to impart a mean temperature to the particles from about 2,6000C to about 3,800°C, and to accelerate the particles to a mean velocity between about 600 to 1000 m/s, produces a thin, uniform, dense, crack-free, nanocrystalline ceria-based coating, which may be applied on porous cermet or metal substrate, for example. The physical environment of a high- velocity oxyfuel (HVOF) thermal spraying gun suitably deployed using standard fuels produces these conditions. The method of the present invention is particularly useful for the cost-effective fabrication of ceria-containing electrolytes for solid oxide fuel cells (SOFCs).

La présente invention a permis la découverte surprenante que linjection de particules à base doxyde de cérium (taille moyenne inférieure à 200 nm) en suspension dans un solvant organique combustible dans un gaz déchappement dont la température maximale est comprise entre environ 2 600 °C et 4 000 °C pour impartir aux particules une température moyenne comprise entre environ 2 600 °C et 3 800 °C, et accélérer les particules à une vélocité moyenne entre environ 600 et 1 000 m/s, produit un revêtement à base d'oxyde de cérium mince, uniforme, dense, sans fissures, nanocristallin, qui peut être appliqué sur des substrats de cermet ou métalliques, par exemple. Lenvironnement physique dun pistolet de pulvérisation thermique oxygaz-combustible à haute vélocité (HVOF) déployé de façon appropriée utilisant des combustibles standard produit ces conditions. Le procédé de la présente invention est particulièrement utile pour la fabrication économique d'électrolytes contenant de loxyde de cérium pour les piles à combustible à oxyde solide (SOFC). DRAWINDRAWING: Voltage (V)   Tension (V) Current density    (A/cm2)  Densité de courant (A/cm2) Power density (W/cm2)   Densité de puissance (W/cm2)

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