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Fabrication of Mn/Co and Co Coatings on AISI 430 for SOFC Interconnect Via Sol-Gel and Dip Coating

Dayaghi, Amir Masoud | 2010

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 41323 (07)
  4. University: Sharif University of Technology
  5. Department: Materials and Sceince Engineering
  6. Advisor(s): Askari, Masoud
  7. Abstract:
  8. With regard to recent progress in decreasing of operating temperature of Solid Oxide Fuel Cell (SOFC), metallic interconnect use widely than ceramic interconnect. Metallic interconnect have interested due to their low cost, easy fabrication and high electronic and thermal conductivity.oxidation resistance of metals is big challenge, because of low conductivity of formed oxide layers that led to increasing of electrical conductivity. Ferritic stainless steel is among the most thriving candidate alloy because of BCC structure that its coefficient of temperature expansion is close to that of other SOFC. Nonetheless, the increase of electrical resistance over the time and the evaporation of chromium species, which contaminate cathode, lead to degradation in stock performance. One approach to improve the interconnect is fabrication of protective coating which has stable electronic conductivity and excellent CTE match with the other cell components. A variety of conductive/protective coating has been suggested and studied over the past several years, such as conductive perovskite oxides and spinels. Spinels such as MnCo2O4 and Co3O4usually can be good electronic conductors and show excellent CTE match with the ferritic stainless substrate and other cell components. Spinel coatings can act as an effective mass-transport barrier to the outward migration of Cr cations. In this study, the mentioned spinels were made from (MnCl2.4H2o) and CoCl2.4H2O as starting materials, citric acid as a chelating agent and distilled water as a solvent. For better adherence, reducing atmosphere (Ar+10%H2) was used for pre-oxidation of coated sample. Results show that spinel coatings demonstrate good improvement in the oxidation resistance
  9. Keywords:
  10. Solid Oxide Fuel Cell (SOFC) ; Sol-Gel Method ; Dipping ; Metallic Interconnect

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