Structure, crystallization, and performances of alkaline‐earth boroaluminosilicate sealing glasses for SOFCs

Jiajia Yan, Teng Zhang, Haizheng Tao, Hongbing Zhan, Yuanzheng Yue

Research output: Contribution to journalJournal articleResearchpeer-review

4 Citations (Scopus)

Abstract

We study the structure, crystallization, and performances of the sealing glasses with the composition (mol.%) of 12Al2O3·8B2O3·40SiO2·40RO (R = Mg, Ca, Sr) for solid oxide fuel cells (SOFCs) before and after isothermal treatment at 700°C, which is within the operation temperature range (600-800°C) of SOFCs. The crystallization behavior has been investigated by differential scanning calorimetry and X-ray diffraction under both dynamic and isothermal conditions. The structural evolution is probed using the Raman and nuclear magnetic resonance spectroscopies. The performances of the sealing glasses are characterized in terms of the coefficient of thermal expansion, the crystallization-induced stress at glass–steel interface. We find that strong crystallization occurs at the operation temperature (700°C) far below the crystallization onset temperature measured by DSC. The structure origin of this anomalous crystallization is discussed in terms of structural heterogeneity of the three studied glasses. We determine the residual stress at the interface between the Ca-containing glass and the steel after isothermal treatment at 700°C for 48 h, but this stress does not lead to falling off the glass layer from the steel. This indicates that this glass is a good candidate to be applied in SOFCs.

Original languageEnglish
JournalJournal of the American Ceramic Society
Volume104
Issue number6
Pages (from-to)2560-2570
Number of pages11
ISSN0002-7820
DOIs
Publication statusPublished - 2021

Keywords

  • crystallization
  • sealing glass
  • sealing performance
  • structural evolution
  • thermal treatment

Fingerprint

Dive into the research topics of 'Structure, crystallization, and performances of alkaline‐earth boroaluminosilicate sealing glasses for SOFCs'. Together they form a unique fingerprint.

Cite this