Effects of crystallization on the 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

60 Scopus citations

Abstract

Effects of crystallization on the high-temperature mechanical properties of a newly developed silicate-based glass sealant (GC-9) are investigated for use in planar solid oxide fuel cell (pSOFC). The aged, crystallized GC-9 glass is produced by heat treatment of the original GC-9 glass at 900 °C for 3 h. Not only crystalline phases are formed but the residual glass is also changed in the aged GC-9 glass after the heat treatment. Mechanical properties of the aged GC-9 glass are determined by four-point bending technique at temperature from 25 °C to 750 °C. The glass transition temperature of the given glass is reduced but the softening temperature is increased by such a crystallization heat treatment. The aged GC-9 glass exhibits a greater flexural strength and Young's modulus than the non-aged one at temperature below 650 °C due to the existence of crystalline phases. At temperature of 700 °C and 750 °C, a greater extent of stress relaxation is found in the aged GC-9 glass such that its strength and stiffness are much lower than those of the non-aged one. The changes in the thermal and mechanical properties through the given aging treatment are favorable for application of the GC-9 glass sealant in pSOFC.

Original languageEnglish
Pages (from-to)3159-3165
Number of pages7
JournalJournal of Power Sources
Volume195
Issue number10
DOIs
StatePublished - 15 May 2010

Keywords

  • Crystallization
  • Glass sealant
  • High temperature
  • Mechanical properties
  • Planar solid oxide fuel cell

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