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YSZ Coating on Ferritic Stainless Steel Interconnect through Sol-Gel Method and Studying its Reaction with Glass Sealant in SOFC

Mousa Mirabad, Homayoun | 2018

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 50818 (07)
  4. University: Sharif University of Technology
  5. Department: Materials Science and Engineering
  6. Advisor(s): Faghihi Sani, Mohammad Ali; Nemati, Ali
  7. Abstract:
  8. Solid oxide fuel cells are used to convert solid-state energy to direct electrical current by electrochemistry mixing a gas fuel and an oxidant in an oxide electrolyte. One of the most interesting aspects of this field for the researchers is the reaction between the metal interconnect and the glass sealant. In the current research, deposition of the YSZ coating onto the metal interconnect in order to impede the reaction with glass sealant and prohibition of its oxidation in oxidizing/reducing environment in high temperature, was mainly investigated. Effect of applying YSZ Thin layer in the intersection of Crofer steel and glass sealant on strength and chemical durability of these two components were studied. Sol-gel method was used to deposit YSZ coating. The coating was synthesized by the dipping pace of 5 cm/min, sintered 3 times in 850 °C and featured dense and integrated properties without any major crack in the structure. The coating was capable of hindering the severe oxidation of steel and interaction of glass and steel and also stopped production of unwanted products due to these interactions, after 120 hour of heat treatment in 800°C. The morphology of surface and cross-section of the coating was examined after deposition by the dip-coating method, as well as the interactions in the intersection of glass/YSZ and steel/YSZ. The analysis of the crystalline structure of layers, surface morphology, interactions of intersections and diffusion of elements, were done by XRD, Raman, SEM, FE-SEM and EDS line scan, respectively
  9. Keywords:
  10. Glass ; Stainless Steel ; Dip Coating ; Interconnect ; Sol-Gel Method ; Solid Oxide Fuel Cell (SOFC) ; Sealant

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