Steel foil interconnects

Another concept for Interconnecting SOFCs is the use of FeCrAlY steels in combination with silver pins [62], The FeCrAlY steel is used as a thin foil and quickly forms an alumina scale inhibiting the release of Cr from the steel. To avoid high resistances of the alumina scales, the steel foil is perforated with Ag pins acting as contacts between the anode of one cell to the cathode of the next cell in the stack. The use of silver is very attractive due to the low contact resistances [62,72,73]. However, problems regarding silver evaporation at operation temperatures > 700°C [62] and during thermal cycling [72] need to be addressed. 

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