High temperature gas seals

H - Electricity – 01 – M

Patent

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Details

H01M 2/08 (2006.01) C04B 35/119 (2006.01) C04B 35/488 (2006.01) C04B 35/80 (2006.01) H01M 8/02 (2006.01) H01M 8/24 (2006.01)

Patent

CA 2511673

A flexible seal for use in a solid oxide fuel cell stack is formed from a fibre matrix with a plurality of solid particles through tape casting method. The fibres and particles are preferably ceramic and may be formed from alumina or zirconia. The seal may be formed by forming a slurry of fibres, particles, a binder and a non-aqueous solvent, tape casting the slurry, drying the tape seal, die-cutting, prior to installation in the fuel cell stack. A seal in its pre-fired state or unsintered, having a porosity less than 50 % is disclosed.

La présente invention concerne un joint flexible utilisé dans un empilement de piles à combustible à oxyde solide, ledit joint étant formé à partir d'une matrice de fibres avec une pluralité de particules solides, par un procédé de coulée en bandes de matière. Les fibres et les particules sont de préférence en céramique et peuvent être formées à partir d'alumine ou de zircone. Le joint peut être réalisé par formation d'une suspension de fibres, de particules, d'un liant et d'un solvant non aqueux, coulée de la suspension sous la forme d'une bande de matière, séchage du joint sous forme de bande, découpage à l'emporte-pièce, avant mise en place dans l'empilement de piles à combustibles.

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