Evaluation of inkjet-printed spinel coatings on standard and surface nitrided ferritic stainless steels for interconnect application in solid oxide fuel cell devices

Sathish Pandiyan, Manuel Bianco, Ahmad El-Kharouf, Rumen I. Tomov, Robert Steinberger-Wilckens

Research output: Contribution to journalArticlepeer-review

Abstract

Inkjet printing technology was employed for the application of protective layer coatings in SOFC metallic interconnects. Aqueous-based spinel coatings were inkjet-printed on standard and surface nitrided K41 ferritic stainless-steel substrates. Inkjet-printed substrates were exposed to high-temperature oxidation and Area Specific Resistance (ASR) tests for 1000 h at 700 °C in air with 3% volume humidity, simulating SOFC cathode environment. Performance of inkjet printed coatings and effect of nitriding stainless-steel substrates were evaluated based on chromium migration/retention and Area Specific Resistance. Sol-gel infiltration was introduced to develop a scaffold layer over the porous microstructure. With the ASR reduced to a level ∼60 mΩ cm 2 and chromium concentration in the getter (cathode) material below 1 atomic%, close to the detection threshold, the protective layers produced via inkjet printing present a promising solution for SOFC interconnector applications.

Original languageEnglish
JournalCeramics International
Early online date15 Apr 2022
DOIs
Publication statusE-pub ahead of print - 15 Apr 2022

Bibliographical note

Funding Information:
This work was supported by the FCH JU within the EU H2020 framework via the project SCORED 2:0 under contract no. 325331 , and by the EPSRC (UK) through the Centre for Doctoral Training in Fuel Cells and their Fuels, under contract EP/M014304/1 . The authors wish to acknowledge the European Commission and the UK Engineering and Physical Sciences Research Council for their respective financial support. The authors would like to thank Professor R. Vasant Kumar, Department of Materials Science and Metallurgy, University of Cambridge , for his support through granting access to the inkjet printing facility.

Funding Information:
This work was supported by the FCH JU within the EU H2020 framework via the project SCORED 2:0 under contract no. 325331, and by the EPSRC (UK) through the Centre for Doctoral Training in Fuel Cells and their Fuels, under contract EP/M014304/1. The authors wish to acknowledge the European Commission and the UK Engineering and Physical Sciences Research Council for their respective financial support. The authors would like to thank Professor R. Vasant Kumar, Department of Materials Science and Metallurgy, University of Cambridge, for his support through granting access to the inkjet printing facility.

Publisher Copyright:
© 2022 Elsevier Ltd and Techna Group S.r.l.

Keywords

  • SOFC interconnectors
  • Ferritic stainless steel
  • Protective coating
  • Inkjet printing
  • Nitriding
  • High temperature corrosion

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