Effect of substrate thickness on oxide scale spallation for solid oxide fuel cells

Low temperature processed MnCo2O4 and MnCo1.8Fe0.2O4 as effective protective coatings for solid oxide fuel cell interconnects at 750 °C

“…Chromia on coated samples, as visible in Figure 6C, is around 1 µm thick after 5300 hours at 750°C. This thickness after a relatively long measurement time can be regarded as satisfactory and far from possible scale breakdown/spallation due to mechanical stresses [69,70].…”

Microstructural and electrical characterization of Mn-Co spinel protective coatings for solid oxide cell interconnects

“…Among the available alloys, chromia-forming ferritic steels are chosen as they form an oxide with a sufficient electrical conductivity at high temperatures and have a coefficient of thermal expansion (CTE) similar to other cell components [7][8][9][10]. Under SOC relevant conditions, Cr2O3 reacts with water molecules by forming volatile compounds.…”

Numerical evaluation of oxide growth in metallic support microstructures of Solid Oxide Fuel Cells and its influence on mass transport

“…Furthermore, it is assumed that the growing oxide film does not crack or spall. This is not fully consistent with reality, as compressive stresses might induce spallation with increasing scale thickness [45]. This phenomena is not fully understood and modelling of this is thus a separate study, and beyond the scope of this work.…”

“…Firstly, the micrograph shows regions with a lower thickness, which may indicate spallation [45], which is not accounted for in current model, or simply effects due to the polishing procedure. Secondly, regions with a thicker oxide can be found in Fig.…”