Microstructure evolution during air bonding of Al2O3 to Al2O3 joints using bismuth–borate–zinc glass

Wei Guo, Tiesong Lin, Tong Wang, Peng He, D. P. Sekulic, Shu Guo

Research output: Contribution to journalArticlepeer-review

38 Scopus citations


Alumina ceramics with 95 wt.% purity were sealed together using a bismuth based glass, 40Bi2O3–40B2O3–20ZnO (mol.%). The wettability of the glass on the Al2O3 substrate was investigated. The results showed a contact angle of ≤36.5° was achieved when the temperature was ≥630 °C. Subsequently, sealing cycles were performed at temperatures of 520–700 °C for 30 min. The dependence of microstructure evolution of the joints on temperature was investigated. Bi24B2O39 was detected to be the product in the joints sealed at 530–580 °C, while ZnAl2O4 was identified to be the main product when sealing at temperature of ≥650 °C due to the reaction between the Al2O3 substrate and ZnO from the glass. The influence of dwelling time at 700 °C on microstructure evolution of the joints was also studied. The results showed that the size of ZnAl2O4 increased with increasing holding time.

Original languageEnglish
Pages (from-to)4015-4023
Number of pages9
JournalJournal of the European Ceramic Society
Issue number13
StatePublished - Oct 2017

Bibliographical note

Publisher Copyright:
© 2017 Elsevier Ltd


  • AlO
  • BiBO
  • Bismuth-borate-zinc glass
  • Sealing
  • ZnAlO

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry


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