Peer Reviewed

Journal of Thermal Spray Technology

, Volume 20, Issue 1, pp 154-159

The Structure and Properties of Plasma Sprayed Iron Oxide Doped Manganese Cobalt Oxide Spinel Coatings for SOFC Metallic Interconnectors

  • Jouni PuranenAffiliated withDepartment of Materials Science, Tampere University of Technology Email author 
  • , Juha LagerbomAffiliated withVTT, Research Centre of Finland
  • , Leo HyvärinenAffiliated withDepartment of Materials Science, Tampere University of Technology
  • , Mikko KylmälahtiAffiliated withDepartment of Materials Science, Tampere University of Technology
  • , Olli HimanenAffiliated withVTT, Research Centre of Finland
  • , Mikko PihlatieAffiliated withVTT, Research Centre of Finland
  • , Jari KiviahoAffiliated withVTT, Research Centre of Finland
  • , Petri VuoristoAffiliated withDepartment of Materials Science, Tampere University of Technology

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Abstract

Manganese cobalt oxide spinel doped with Fe2O3 was studied as a protective coating on ferritic stainless steel interconnects. Chromium alloying causes problems at high operation temperatures in such oxidizing conditions where chromium compounds evaporate and poison the cathode active area, causing the degradation of the solid oxide fuel cell. In order to prevent chromium evaporation, these interconnectors need a protective coating to block the chromium evaporation and to maintain an adequate electrical conductivity. Thermal spraying is regarded as a promising way to produce dense and protective layers. In the present work, the ceramic Mn-Co-Fe oxide spinel coatings were produced by using the atmospheric plasma spray process. Coatings with low thickness and low amount of porosity were produced by optimizing deposition conditions. The original spinel structure decomposed because of the fast transformation of solid-liquid-solid states but was partially restored by using post-annealing treatment.

Keywords

interconnect Mn-Co spinel plasma spraying SOFC