The impact of alloy chemistry on the formation of a silicon-rich subscale on two classes of ferritic steels

Development of a new cost effective Fe–Cr ferritic stainless steel for SOFC interconnect

“…5. According to a previous study [21], only 0.05% Si content in the 17%Cr ferritic stainless steel can make distinct Si oxide layer on the interface up to about 0.2 mm thickness during oxidation. However, in spite of the Si content about 0.1%, a distinctive Si oxide layer was not formed in the 460FC alloy.…”

Comparison of MnCo2O4 coated Crofer 22 H, 441, 430 as interconnects for intermediate-temperature solid oxide fuel cell stacks

“…In case of MCO coated 430, Si-enrichment was detected between the steel and the Cr2O3 scale by EDX analysis. The volume of the Si-enriched area was too small compared to the expected EDX interaction volume (~1 µm) to obtain an accurate quantification, but based on previous reports, the Si-enrichment likely corresponds to SiO2 [22]. The SiO2 scale is visible in the SEM back scatter electron (BSE) image (Fig.…”

“…Previous studies have indicated the potential of using 441 and 430 steels as the interconnect material, but have also identified some challenges such as formation of insulating SiO2 scales, poor scale adherence, and a lower oxidation resistance compared to the more specialized alloys [22][23][24][25][26][27][28][29][30][31][32]. The majority of these investigations have been carried out at elevated temperatures (750-850 C) and there are only a few studies reporting on the performance of low-cost FSSs below 700 C [33][34][35].…”

Metal-Supported Solid Oxide Fuel Cells: A Review of Recent Developments and Problems

“…However, another important aspect to consider when using ferritic stainless steel is the presence of silicon and aluminum, which have the potential to form non-conductive oxides during operation. A previous study has highlighted that even a silicon content as low as 0.017 wt.% can undergo oxidation in stainless steel [34].…”