Study on interfacial compatibility of glass seals/interconnector coatings in solid oxide cell stacks

Phase compositions of the glass seal and the thermally converted coating were analyzed by X-ray diffraction (XRD). [Results]: Under humid hydrogen atmosphere, the interfacial morphology becomes rougher with increased porosity, and local elemental boundaries become less distinct, indicating a more complex interfacial evolution. However, the interfaces remain continuous, and Cr is mainly confined to the SUS441 side without evident large-scale outward diffusion.

[Conclusions]: These results suggest that the MnCoNiFeCu-derived spinel-based protective coating can maintain basic interfacial bonding with both SUS441 interconnector and G0 glass seal under the tested conditions. Although reducing and humid hydrogen atmospheres promote interfacial roughening and structural heterogeneity, Cr remains mainly confined to the SUS441 side. Therefore, this coating provides a useful reference for interfacial design in SOC stack.