Do you want to achieve more cost-effective industrial mass production of interconnects in Solid Oxide Fuel Cells (SOFCs)? The fact is that new stack designs for stationary power units are bringing down operating temperatures to the 600 – 800°C range. This, in turn, calls into question the need for traditional ceramic plate materials in terms of manufacturability, cost, mechanical strength and electrical conductivity.

One smart solution is to combine a resilient, low-cost substrate with a protective coating that avoids Cr evaporation and its resulting cell degradation. This is the whole idea behind Sanergy™ HT, our state-of-the-art roll to roll coating lines for mass production technology which combines commercially available ferritic stainless steel with a very thin, uniform PVD-coated CeCo material – all to extend the lifetime of the SOFC.

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Benefits of Sandvik coated steel strip

In addition to streamlining the production process, Sanergy™ HT technology provides a multi-layered CeCo nanocoating that dramatically reduces chromium evaporation from the plate thanks to a cobalt coating. The corrosion resistance properties of the interconnect are enhanced with the cerium coating. This can be seen in the smaller mass grain and a thinner Cr2O3 layer formation after long-term exposure of the material at 800°C.

Good adhesion of the coating enables the forming of the coated stainless strip steel to the desired interconnect shape. The self-healing properties of the coating ensure the same excellent performance of Sanergy™ before and after forming. Any microscopic cracks introduced to the coating by forming will heal and disappear completely during operation of the fuel cell.

Ferritic stainless steel is used as the standard stainless steel for coating. However, other grades may be available upon request.

Main characteristics of Sanergy™ HT coated strip steel for SOFC interconnects

  • Minimizes chromium evaporation
  • Low area-specific resistance
  • Excellent high-temperature corrosion resistance ensures low electrical degradation
  • Good processing and forming characteristics
  • Well-matched thermal expansion to other cell components

Fuel cells

Read more about fuel cells and our materials for fuel cells.