Predicting Young's modulus of glass/ceramic sealant for solid oxide fuel cell considering the combined effects of aging, micro-voids and self-healing

Wenning Liu, Xin Sun, Mohammad A. Khaleel

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

We study the temperature dependent Young's modulus for the glass/ceramic seal material used in solid oxide fuel cells (SOFCs). With longer heat treatment or aging time during operation, further devitrification may reduce the residual glass content in the seal material while boosting the ceramic crystalline content. In the meantime, micro-voids induced by the cooling process from the high operating temperature to room temperature can potentially degrade the mechanical properties of the glass/ceramic sealant. Upon reheating to the SOFC operating temperature, possible self-healing phenomenon may occur in the glass/ceramic sealant which can potentially restore some of its mechanical properties. A phenomenological model is developed to model the temperature dependent Young's modulus of glass/ceramic seal considering the combined effects of aging, micro-voids, and possible self-healing. An aging time-dependent crystalline content model is first developed to describe the increase of the crystalline content due to the continuing devitrification under high operating temperature. A continuum damage mechanics (CDM) model is then adapted to model the effects of both cooling induced micro-voids and reheating induced self-healing. This model is applied to model the glass-ceramic G18, a candidate SOFC seal material previously developed at PNNL. Experimentally determined temperature-dependent Young's modulus is used to validate the model predictions.

Original languageEnglish
Pages (from-to)1193-1200
Number of pages8
JournalJournal of Power Sources
Volume185
Issue number2
DOIs
Publication statusPublished - 1 Dec 2008
Externally publishedYes

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Keywords

  • Aging
  • Glass/ceramic sealant
  • Micro-damage
  • Self-healing
  • SOFC
  • Temperature-dependent modulus

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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