Several years ago a new material was introduced for use as an interconnect material for solid oxide fuel cell (SOFC) application. This new material is designated UNS S44535 and it has unique properties that make it an ideal choice in application as an interconnect material. The key properties are the coefficient of thermal expansion (CTE), which closely matches the ceramic materials used in the SOFC stack, the good electrical conductivity of the protective oxide scale that is formed during operation of the fuel cell stack and the outstanding oxidation resistance at operating temperatures. Several lessons were learned during the development, scale-up, and production of the UNS S44535 material. The end result is a commercially available material that meets the technical requirements for interconnects in SOFC application.

Subject
Materials, Electrochemical cells, Chromia, Oxide formation, Chromium, Oxide layers, Thermal expansion, Metal oxides, Oxide scales, Scale formation, Heat, Ferritic stainless steel, Oxidation
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2006
Association for Materials Protection and Performance (AMPP)
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