Electrically conductive steel-ceramic composite and process...

H - Electricity – 01 – M

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H01M 8/02 (2006.01)

Patent

CA 2613878

The invention relates to a electrically conductive steel-ceramic connection comprising a steel interconnector and an electrically conductive ceramic joining layer arranged thereon. The interconnector comprises a ferritic steel containing Cr in a quantity ranging from 18 to 24% by weight. The ceramic layer contains perovskite of a formula Ln1-x Srx Mn1-yCoyO3-.delta. or Ln1- xSrxFe1-yCoyO3-.delta., wherein 0,1 <= x <= 0,4, 0,1 <= y <= 0,6, 0 <= .delta. <= x/2 and Ln = La-Lu. The inventive steel-ceramic connection is usable for a high-temperature fuel cell and regularly exhibits good adhesive properties and a low transition resistance (initial transition resistance R approximately equal to 0,01 .OMEGA. cm2). Said steel-ceramic connection makes it possible to advantageously introduce a ferritic steel into high-temperature fuel cells. The inventive method for producing said steel-ceramic connection consists in pre-treating an inserted ceramic powder exhibiting good sinterability during an assembly process and during the fuel cell operation.

L'invention concerne une liaison céramique-acier électroconductrice comprenant un élément d'interconnexion en acier ainsi qu'une couche de liaison conductrice, en céramique disposée sur celui-ci. L'élément d'interconnexion comprend de l'acier ferritique présentant entre 18 et 24 % en poids de Cr. La couche céramique présente de la pérovskite de formule Ln1-x Srx Mn1-yCoyO3-< ou Ln1-xSrxFe1-yCoyO3-?, dans laquelle 0,1 = x = 0,4, 0,1= y = 0,6, 0 = ? = x/2 et Ln = La-Lu. La liaison céramique-acier de l'invention est destinée à être appliquée dans une pile à combustible haute température. Elle présente régulièrement de bonnes propriétés d'adhésion et une résistance faible à la transition (résistance à la transition de départ R environ 0,01 O cm<2>). La liaison céramique-acier permet, de manière avantageuse, l'introduction d'acier ferritique dans des piles à combustible haute température. Le procédé de production de la liaison céramique-acier comprend un prétraitement de la poudre céramique introduite, laquelle présente une bonne capacité d'agglomération, lors du processus d'assemblage, et une bonne adhésion, lors du fonctionnement de la pile à combustible.

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