Protective coating for substrates subject to high...

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H01M 8/02 (2006.01) C23C 30/00 (2006.01) H01M 8/24 (2006.01)

Patent

CA 2516222

As a rule, chromium-oxide forming materials for high temperatures, in particular chromium-based alloys or chromium-rich alloys based on iron (ferritic steel), are used as interconnector materials that are subjected to high temperatures. At SOFC operating temperatures, said material group forms a chromium-based oxidic top coating, which has the advantage of preventing rapid oxidation damage, but also the disadvantage of continuing to react, forming Cr(VI) compounds. Said volatile compounds react regularly with the cathode material, producing the negative effect of impairing the oxygen reduction. The invention relates to a gas-tight protective coating, devoid of chromium, for chromium-oxide forming substrates, such as for example typical interconnector materials, said coating regularly preventing the evaporation of chromium VI compounds during SOFC operating conditions. The invention also relates to a simple method for producing said gas-tight protective coating that is devoid of chromium.

En tant que matières d'interconnexion soumises à des températures élevées, on utilise en général des matières pour températures élevées formant de l'oxyde de chrome, en particulier des alliages à base de chrome ou des alliages à base de fer riches en chrome (aciers ferritiques). Les matières de ce groupe forment, aux températures de fonctionnement de piles à combustible SOFC, une couche de couverture oxydique à base d'oxyde de chrome qui protège, de façon avantageuse, une telle matière contre un endommagement rapide par oxydation, mais qui, de façon désavantageuse, continue à réagir pour former des composés de Cr(VI). Ces composés volatils réagissent normalement avec la matière de cathode et conduisent, de façon avantageuse, un empêchement catalytique de la réduction de l'oxygène. Cette invention concerne donc une couche protectrice étanche aux gaz, exempte de chrome, pour substrats formant de l'oxyde de chrome, par exemple constitués de matières d'interconnexion usuelles, qui empêche normalement une évaporation des composés de chrome (VI) dans les conditions de fonctionnement de piles à combustible SOFC. L'invention concerne en outre un procédé de réalisation simple de cette couche protectrice étanche aux gaz, exempte de chrome.

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