Enhancing the long-term stability of Ag based seals for solid oxide fuel/electrolysis applications by simple interconnect aluminization

Xiaoqing Si, Jian Cao, Ilaria Ritucci, Belma Talic, Jicai Feng, Wolff-Ragnar Kiebach*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review


Ag-(0e8 mol%) CuO is used to successfully join aluminized ferritic stainles ssteel interconnect to the ceria-gadolinia (CGO) barrier layer of a solid oxidefuel/electrolysis cell by reactive air brazing at 1000 _C in air. The wetting of Ag-CuO on CGO istailored by varying the CuO content. The effects of the CuO content on thejoint microstructure are discussed. The long-term stability of brazed joints is evaluated by aging in oxidizing (air) and reducing (4% H2-50% H2O-N2) 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
Issue number5
Pages (from-to)3063-3074
Publication statusPublished - 2019


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

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