Fracture toughness of glass sealants for solid oxide fuel cell application

Hamid Abdoli, Parvin Alizadeh, Dino Boccaccini, Karsten Agersted

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Glass and glass-ceramics are versatile materials and have been widely used for sealing in the ongoing development of intermediate temperature solid oxide fuel cell (SOFC) technology where its integrity is crucial for reliable operation of the stack. The fracture toughness is a key parameter required for the prediction of the mechanical performance of a seal glass. A comparative indentation study on two RE-glasses (RE=La and Y) was performed to evaluate their fracture toughness. Indentation toughness was calculated both through measurements of the indentation crack lengths and of crack-opening displacements in the near regions of a crack tip. Both approaches exhibited good agreement. La-containing glass showed higher stiffness, hardness and fracture toughness, which has been related to the in-situ toughening mechanism caused by devitrification and formation of crystalline phases. © 2013 Elsevier B.V.
Original languageEnglish
JournalMaterials Letters
Volume115
Pages (from-to)75-78
ISSN0167-577x
DOIs
Publication statusPublished - 2014

Keywords

  • Amorphous materials
  • Crack tips
  • Cracks
  • Fracture toughness
  • Glass ceramics
  • Solid oxide fuel cells (SOFC)

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