Development and application of HVOF sprayed spinel protective coating for SOFC interconnects

Olivier Thomann (Corresponding Author), Mikko Pihlatie, Markus Rautanen, Olli Himanen, Juha Lagerbom, Maija Mäkinen, Tommi Varis, Tomi Suhonen, Jari Kiviaho

    Research output: Contribution to journalArticleScientificpeer-review

    26 Citations (Scopus)


    Protective coatings are needed for metallic interconnects used in solid oxide fuel cell (SOFC) stacks to prevent excessive high-temperature oxidation and evaporation of chromium species. These phenomena affect the lifetime of the stacks by increasing the area-specific resistance (ASR) and poisoning of the cathode. Protective MnCo2O4 and MnCo1.8Fe0.2O4 coatings were applied on ferritic steel interconnect material (Crofer 22 APU) by high velocity oxy fuel spraying. The substrate-coating systems were tested in long-term exposure tests to investigate their high-temperature oxidation behavior. Additionally, the ASRs were measured at 700 °C for 1000 h. Finally, a real coated interconnect was used in a SOFC single-cell stack for 6000 h. Post-mortem analysis was carried out with scanning electron microscopy. The deposited coatings reduced significantly the oxidation of the metal, exhibited low and stable ASR and reduced effectively the migration of chromium.
    Original languageEnglish
    Pages (from-to)631-639
    JournalJournal of Thermal Spray Technology
    Issue number5
    Publication statusPublished - 2013
    MoE publication typeA1 Journal article-refereed


    • ASR
    • HVOF spraying
    • interconnect
    • protective coating
    • SOFC
    • spinel
    • stack testing
    • ProperTune


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