High-temperature mechanical properties of a glass sealant for solid oxide fuel cell

Hsiu Tao Chang, Chih Kuang Lin, Chien Kuo Liu

Research output: Contribution to journalArticlepeer-review

49 Scopus citations

Abstract

The high-temperature mechanical properties of a newly developed silicate-based glass sealant, designated as GC-9, have been studied for use in planar solid oxide fuel cell (pSOFC). Four-point bending tests were conducted at room temperature, 550 °C, 600 °C, 650 °C, 700 °C and 750 °C to investigate the variation of flexural strength, elastic modulus, and stress relaxation with temperature for the given glass sealant. Weibull statistic analysis was applied to describe the fracture strength data. The results indicated that the flexural strength was increased with temperature when the testing temperature was below the glass transition temperature (Tg, 668 °C). This was presumably caused by a crack healing effect taking place at high temperatures for glasses. However, with a further increase of temperature to a level higher than Tg, significant stress relaxation was observed to cause extremely large deformation without breaking the specimen. When the controlled displacement rate was increased by an order of magnitude, the stress relaxation effect at 750 °C became less effective. However, the mechanical stiffness of the given glass was significantly reduced at a temperature higher than Tg.

Original languageEnglish
Pages (from-to)1093-1099
Number of pages7
JournalJournal of Power Sources
Volume189
Issue number2
DOIs
StatePublished - 15 Apr 2009

Keywords

  • Four-point bending test
  • Glass transition temperature
  • High temperature
  • Mechanical properties
  • Planar solid oxide fuel cell
  • Weibull statistic analysis

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