In-service degradation of interconnector materials for solid oxide fuel cells

Sanni Mustala, Juha Veivo, Pertti Auerkari, Jari Kiviaho, Matti Noponen

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientific

    Abstract

    The oxide growth and thermal degradation characteristics of three SOFC interconnector alloys have been investigated particularly for the cathode side conditions.The tested materials were ferritic stainless alloys including one common standard grade (alloy 430) and two alloys (Crofer 22 APU, ZMG 232) specifically designed for interconnector service.All three alloys appear to follow parabolic oxidation within the range of testing conditions (up to 500 h at 740 °C in air).A somewhat more pronounced oxidation was found in alloys ZMG 232 and Crofer 22 APU than in alloy 430.During oxidation, a consistent decrease inof iron and increase inof chromium and manganese were observed in the surface oxide.Some chromium transport was detected on the cathode side surface of the cell after 500 h at 740 °C.The results emphasise the importance of an appropriate coating for of the interconnectors, to prevent chromium poisoning on the cathode.A natural coating material would be similar or compatible with the ceramic cathode.Such a coating also has the additional advantage that simpler and cheaper steel grades could be used as the interconnector material.
    Original languageEnglish
    Title of host publicationApplied Material Research at VTT
    Subtitle of host publicationSymposium on Applied Materials
    Place of PublicationEspoo
    PublisherVTT Technical Research Centre of Finland
    Pages40-49
    ISBN (Electronic)951-38-6312-3
    ISBN (Print)951-38-6311-5
    Publication statusPublished - 2006
    MoE publication typeB3 Non-refereed article in conference proceedings
    EventInternal Symposium on Applied Materials - Espoo, Finland
    Duration: 8 Jun 20068 Jun 2006

    Publication series

    SeriesVTT Symposium
    Number244
    ISSN0357-9387

    Conference

    ConferenceInternal Symposium on Applied Materials
    CountryFinland
    CityEspoo
    Period8/06/068/06/06

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