Gast ::
| Hauptseite > Publikationsdatenbank > Managing Residual Stresses in Co-Sintered Multi-Layer Electrolytes for Solid Oxide Cells |
| Hauptseite > Publikationsdatenbank > Managing Residual Stresses in Co-Sintered Multi-Layer Electrolytes for Solid Oxide Cells |
| Conference Presentation (Other) | FZJ-2026-00841 |
; ; ; ;
2025
Abstract: Gadolinium-doped ceria (GDC) is a promising alternative to 8YSZ in solid oxide cells, offering advantages as a fuel electrode. However, interdiffusion between YSZ electrolytes and Ni-GDC electrodes limits its potential. Utilizing a GDC electrolyte in combination with a Ni-GDC electrode is expected to mitigate interdiffusion and enhance performance.In this study, a 3-layer electrolyte was prepared via screen printing. However, co-sintering of half-cells poses challenges due to mismatches in sintering behavior and thermal expansion, leading to residual stresses that cause cracking or spalling, reducing structural and operational stability of the cell.To address this, the sintering behavior of the half-cell was systematically investigated by thermo optical dilatometry. The NiO-YSZ substrate shrinkage during co-sintering was found to be crucial in achieving dense electrolytes. By leveraging this shrinkage, the co-sintering temperature was reduced to minimize residual stresses while maintaining densification. The effect of different substrate pre-sintering temperatures, combined with various co-sintering temperatures, were evaluated in relation to electrolyte microstructure and residual stresses. Additional doping of GDC was intended to enhance sintering activity at lower temperatures. Microstructures were examined via scanning electron microscopy. Residual stresses were analyzed by X-ray diffraction.
Keyword(s): Materials Science (2nd)
|
The record appears in these collections: |