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Mechanical reliability and life prediction of coated metallic interconnects within solid oxide fuel cells

Author

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  • Xu, Zhijie
  • Xu, Wei
  • Stephens, Elizabeth
  • Koeppel, Brian

Abstract

Metallic cell interconnects (IC) made of ferritic stainless steels, i.e., iron-based alloys, have been increasingly favored in the recent development of planar solid oxide fuel cells (SOFCs) because of their advantages in excellent imperviousness, low electrical resistance, ease in fabrication, and cost effectiveness. Typical SOFC operating conditions inevitably lead to the formation of oxide scales on the surface of ferritic stainless steel, which could cause delamination, buckling, and spallation resulting from the mismatch of the coefficient of thermal expansion and eventually reduce the lifetime of the interconnect components. Various protective coating techniques have been applied to alleviate these drawbacks. In the present work, a fracture-mechanics-based quantitative modeling framework has been established to predict the mechanical reliability and lifetime of the spinel-coated, surface-modified specimens under an isothermal cooling cycle. Analytical solutions have been formulated to evaluate the scale/substrate interfacial strength and determine the critical oxide thickness in terms of a variety of design factors, such as coating thickness, material properties, and uncertainties. The findings then are correlated with the experimentally measured oxide scale growth kinetics to quantify the predicted lifetime of the metallic interconnects.

Suggested Citation

  • Xu, Zhijie & Xu, Wei & Stephens, Elizabeth & Koeppel, Brian, 2017. "Mechanical reliability and life prediction of coated metallic interconnects within solid oxide fuel cells," Renewable Energy, Elsevier, vol. 113(C), pages 1472-1479.
  • Handle: RePEc:eee:renene:v:113:y:2017:i:c:p:1472-1479
    DOI: 10.1016/j.renene.2017.06.103
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    Cited by:

    1. Li, Changzhi & Lin, Wei & Wu, Hangyu & Li, Yang & Zhu, Wenchao & Xie, Changjun & Gooi, Hoay Beng & Zhao, Bo & Zhang, Leiqi, 2023. "Performance degradation decomposition-ensemble prediction of PEMFC using CEEMDAN and dual data-driven model," Renewable Energy, Elsevier, vol. 215(C).
    2. Wang, Chao & Xu, Zhijie & Koeppel, Brian, 2020. "A discrete element model simulation of structure and bonding at interfaces between cathode and cathode contact paste in solid oxide fuel cells," Renewable Energy, Elsevier, vol. 157(C), pages 998-1007.
    3. Yang, Yang & Yu, Xiaoran & Zhu, Wenchao & Xie, Changjun & Zhao, Bo & Zhang, Leiqi & Shi, Ying & Huang, Liang & Zhang, Ruiming, 2023. "Degradation prediction of proton exchange membrane fuel cells with model uncertainty quantification," Renewable Energy, Elsevier, vol. 219(P2).

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