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Application of sol-gel technique to synthesis of copper-cobalt spinel on the ferritic stainless steel used for solid oxide fuel cell interconnects

Paknahad, P ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.jpowsour.2014.04.122
  3. Abstract:
  4. The conductive CuCo2O4 spinel coating is applied on the surface of the AISI 430 ferritic stainless steel by the dip-coating sol-gel process and it is evaluated in terms of the microstructure, oxidation resistance and electrical conductivity. The results show that the CuCO2O 4 coating forms a double-layer scale consisting of a Cr, Fe-rich subscale and Cu-Co spinel top layer after 500 h in air at 800 °C. This scale is protective, acts as an effective barrier against Cr migration into the outer oxide layer and alleviates the cathode Cr-poisoning. The oxidation resistance is significantly enhanced by the protective coating with a parabolic rate constant of 5.8 × 10-13 gr2 cm-4 s -1, meanwhile the electrical conductivity is considerably improved due to inhibited growth of resistive Cr2O3 oxide scale. The area specific resistance at temperatures between 550 and 800 °C is in the range of 11.5 and 22.2 mΩ cm2
  5. Keywords:
  6. Coating ; Metallic interconnects ; Sol-gel ; Solid oxide fuel cell ; Spinel ; Coatings ; Electric conductivity ; Ferritic steel ; Oxidation resistance ; Protective coatings ; Scale (deposits) ; Sol-gel process ; Solid oxide fuel cells (SOFC) ; AISI 430 ferritic stainless steels ; Area-specific resistances ; Electrical conductivity ; Ferritic stainless steel ; Parabolic rate constants ; Sol-gel technique ; Chromate coatings
  7. Source: Journal of Power Sources ; Vol. 266, issue , 2014 , pp. 79-87 ; ISSN: 03787753
  8. URL: http://www.sciencedirect.com/science/article/pii/S0378775314006235