A Study on the Electrical Conductivity of Coated Fe- 17%Cr Alloy Used in SOFCs

Spinel coatings that contain cobalt are hopeful candidates for Solid oxide fuel cell (SOFC) interconnect applications because of their high conductivity. The purpose of this work was to investigate the electrical conductivity of AISI 430 stainless steel which was coated in a Co-base pack mixture by pack cementation method. Electrical conductivity of the coated substrates was tested as a function of temperature by annealing the samples from room temperature to 800 ºC. Also electrical conductivity has been investigated as a function of oxidation time during isothermal oxidation at 800 ºC. Results showed the increase of temperature caused to the decrease of electrical conductivity .Result of X-ray diffraction pattern exhibited, that the coating layer transformed to MnCo2O4 and CoCr2O4 spinels during annealing in isothermal oxidation. These spinels improved electrical conductivity of coated substrates (103 S.cm-1) compared to uncoated substrates (27.7 S.cm-1) after 200 h oxidation at 800 ºC.

کلیدواژه ها:

Electrical conductivity ، Solid oxide fuel cell (SOFC) ، AISI 430 ferritic stainless steel ، Spinel