Mechanical durability of solid oxide fuel cell glass-ceramic sealant/steel interconnect joint under thermo-mechanical cycling

Chih Kuang Lin, Kun Yi Chen, Si Han Wu, Wei Hong Shiu, Chien Kuo Liu, Ruey Yi Lee

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

A testing method is developed to quantitatively determine the thermo-mechanical cycling life in oxidizing atmosphere for the joint between a solid oxide fuel cell glass-ceramic sealant and a ferritic stainless steel interconnect. Thermo-mechanical cycling tests are performed under cyclic shear or tensile loading in conjunction with cyclic temperature variance between 40 °C and 800 °C. Results reveal thermo-mechanical cycling life under both shear and tensile loadings increases with a decrease in end stress at 800 °C, for a certain end stress at 40 °C. Nevertheless, for a certain end stress at 800 °C, the tensile thermo-mechanical cycling life increases with a decrease in end stress at 40 °C, while the shear thermo-mechanical cycling life is independent of end stress at 40 °C. A difference in fracture pattern is also observed between shear and tensile loadings. For shear loading, fracture mainly takes place along the interface between glass-ceramic sealant and an oxide layer, such as BaCrO4 or Cr2O3. However, for tensile loading, fracture mainly occurs within the glass-ceramic layer, following crack initiation at the interface of Cr2O3/sealant or Cr2O3/BaCrO4.

Original languageEnglish
Pages (from-to)1205-1213
Number of pages9
JournalRenewable Energy
Volume138
DOIs
StatePublished - Aug 2019

Keywords

  • Glass-ceramic sealant
  • Interconnect
  • Joint
  • Solid oxide fuel cell
  • Thermo-mechanical cycling

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