Densification kinetics during isothermal sintering of 8YSZ

Byung Nam Kim, Tohru Suzuki, Koji Morita, Hidehiro Yoshida, Yoshio Sakka, Hideaki Matsubara

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Abstract

The densification behavior during the isothermal sintering of 8YSZ was examined in the initial and intermediate stages of sintering. In the initial stage, a difficulty in evaluating the densification behavior arises from the transition of the stable pore structure and the limitation of the theoretical two-sphere model. In the intermediate stage, a linear relationship with a slope of -1/2 is observed between the densification rate and the time. An empirical equation of the densification kinetics is proposed and found to be valid in a wide density range. At a relative density of 0.6-0.73, the activation energy is 688 kJ/mol. Rapid grain growth is observed at a relative density of 0.73-0.8 and >0.9 for the isothermal sintering at 1200-1300 °C and 1400-1500 °C, respectively. The rapid grain growth reduced significantly the densification rate. The densification mechanism and grain growth behavior are also discussed.

Original languageEnglish
Pages (from-to)1269-1275
Number of pages7
JournalJournal of the European Ceramic Society
Volume36
Issue number5
DOIs
Publication statusPublished - 2016 Apr 1
Externally publishedYes

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Keywords

  • Activation energy
  • Densification
  • Grain growth
  • Kinetics
  • Sintering

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

Cite this

Kim, B. N., Suzuki, T., Morita, K., Yoshida, H., Sakka, Y., & Matsubara, H. (2016). Densification kinetics during isothermal sintering of 8YSZ. Journal of the European Ceramic Society, 36(5), 1269-1275. https://doi.org/10.1016/j.jeurceramsoc.2015.11.041