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Oxidation resistance, thermal expansion and area specific resistance of Fe-Cr alloy interconnector for solid oxide fuel cell

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Abstract

It is promising for metal especially ferritic stainless steel (FSS) to be used as interconnector when the solid oxide fuel cell (SOFC) is operated at temperature lower than 800 °C. However, there are many challenges for FSS such as anti-oxidant, poisoning to cathode and high area specific resistance (ASR) when using as SOFC interconnector. The effect of Cr content (12–30 mass%) in Fe-Cr alloys on thermal expansion coefficient (TEC), oxidation resistance, microstructure of oxidation scale and ASR was investigated by thermo-gravimetry, scanning electron microscopy, energy dispersive spectroscopy and four-probe DC technique. The TEC of Fe-Cr alloys is (11−13) × 10−6 K−1, which excellently matches with other SOFC components. Alloys have excellent oxidation resistance when Cr content exceeds 22 mass% because of the formation of chromium on the surface of alloy. The oxidation rate constants kd and ks decrease rapidly with increasing the Cr content and then increase slowlywhen the Cr content is higher than 22 mass%. The kinetic results indicate that Cr evaporation must be considered at high temperature for Fe-Cr alloys. After the alloys were oxidized in air at 800 °C for 500 h, log(ASR/T) (T is the absolute temperature) presents linear relationship with 1/T and the conduct activation energy is 0.6–0.8 eV (Cr16-30). Optimal Cr content is 22–26 mass% considering the oxidation resistance and ASR.

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Authors and Affiliations

  1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, 100083, Beijing, China

    Liu-zhen Bian, Zhi-yuan Chen & Kuo-chih Chou

  2. School of Materials Science and Engineering, University of Science and Technology Beijing, 100083, Beijing, China

    Zhi-yuan Chen & Fu-shen Li

  3. Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, 100083, Beijing, China

    Li-jun Wang Ph.D. (Assoc. Prof.)

Authors
  1. Liu-zhen Bian
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  2. Zhi-yuan Chen
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  3. Li-jun Wang Ph.D.
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  4. Fu-shen Li
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  5. Kuo-chih Chou
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Correspondence to Li-jun Wang Ph.D..

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Bian, Lz., Chen, Zy., Wang, Lj. et al. Oxidation resistance, thermal expansion and area specific resistance of Fe-Cr alloy interconnector for solid oxide fuel cell. J. Iron Steel Res. Int. 24, 77–83 (2017). https://doi.org/10.1016/S1006-706X(17)30011-0

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  • DOI: https://doi.org/10.1016/S1006-706X(17)30011-0

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