Enhancing the long-term stability of Ag based seals for solid oxide fuel/electrolysis applications by simple interconnect aluminization
| Autor: | Ragnar Kiebach, Jian Cao, Ilaria Ritucci, Xiaoqing Si, Belma Talic, Jicai Feng |
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| Rok vydání: | 2019 |
| Předmět: |
Electrolysis
Materials science Renewable Energy Sustainability and the Environment High-temperature corrosion Metallurgy Oxide Energy Engineering and Power Technology 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Microstructure 01 natural sciences 0104 chemical sciences Corrosion law.invention chemistry.chemical_compound Fuel Technology chemistry law Brazing Solid oxide fuel cell Wetting 0210 nano-technology |
| Zdroj: | International Journal of Hydrogen Energy. 44:3063-3074 |
| ISSN: | 0360-3199 |
| DOI: | 10.1016/j.ijhydene.2018.11.071 |
| Popis: | Ag-(0–8 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 Ag CuO 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% 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. |
| Databáze: | OpenAIRE |
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