Life prediction of coated and uncoated metallic interconnect for solid oxide fuel cell applications

W. N. Liu, X. Sun, E. Stephens, M. A. Khaleel

Research output: Contribution to journalArticle

63 Citations (Scopus)

Abstract

In this paper, we present an integrated experimental and modeling methodology in predicting the life of coated and uncoated metallic interconnect (IC) for solid oxide fuel cell (SOFC) applications. The ultimate goal is to provide cell designer and manufacture with a predictive methodology such that the life of the IC system can be managed and optimized through different coating thickness to meet the overall cell designed life. Crofer 22 APU is used as the example IC material system. The life of coated and uncoated Crofer 22 APU under isothermal cooling was predicted by comparing the predicted interfacial strength and the interfacial stresses induced by the cooling process from the operating temperature to room temperature, together with the measured oxide scale growth kinetics. It was found that the interfacial strength between the oxide scale and the Crofer 22 APU substrate decreases with the growth of the oxide scale, and that the interfacial strength for the oxide scale/spinel coating interface is much higher than that of the oxide scale/Crofer 22 APU substrate interface. As expected, the predicted life of the coated Crofer 22 APU is significantly longer than that of the uncoated Crofer 22 APU.

Original languageEnglish
Pages (from-to)1044-1050
Number of pages7
JournalJournal of Power Sources
Volume189
Issue number2
DOIs
Publication statusPublished - 15 Apr 2009
Externally publishedYes

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Keywords

  • Crofer 22 APU
  • Ferritic stainless steel interconnect
  • Indentation test
  • Oxide scale
  • Solid oxide fuel cell (SOFC)
  • Spinel coating

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Renewable Energy, Sustainability and the Environment
  • Physical and Theoretical Chemistry

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