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.
- Reactive air brazing
- AgeCuO braze
- Solid oxide fuel cell
- Solid oxide electrolysis cell
- High temperature corrosion