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Ag-(0e8 mol%) CuO is used to successfully join aluminized ferritic stainless steel interconnect to the ceria-gadolinia (CGO) barrier layer of a solid oxide fuel/electrolysis cell by reactive air brazing at 1000 _C in air. The wetting of AgeCuO on CGO is tailored by varying the CuO content. The effects of the CuO content on the joint microstructure are discussed.  The long-term stability of brazed joints is evaluated by aging in oxidizing (air) and reducing (4% H2e50% H2OeN2) atmospheres at 800 _C for 250 h. An Ag-2mol% CuO braze results in the best joint stability during aging. Aluminization of the steel to create an alumina surface layer provides excellent protection of the steel both during the joining process and aging in the 2 atm. No degradation related to steel corrosion and outward diffusion of elements from the steel can be observed.
Original languageEnglish
JournalInternational Journal of Hydrogen Energy
Volume44
Issue number5
Pages (from-to)3063-3074
ISSN0360-3199
DOIs
StatePublished - 2019
CitationsWeb of Science® Times Cited: 0

    Research areas

  • Reactive air brazing, Aluminization, AgeCuO braze, Solid oxide fuel cell, Solid oxide electrolysis cell, High temperature corrosion
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