Evaluation of densification and grain-growth behavior during isothermal sintering of zirconia

Byung Nam Kim, Tohru Suzuki, Koji Morita, Hidehiro Yoshida, Ji Guang Li, Hideaki Matsubara

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

The densification behavior during the isothermal sintering of 7.8 mol% Y2O3-stabilized zirconia was examined in the intermediate and final stages of sintering. In the intermediate stage, it is shown that the relationship between the grain size and the relative density is not invariant, but is temperature dependent. The relationship is combined with the measured densification rate to evaluate the grain size exponent, the activation energy and an unspecified function of density. The evaluation of the characteristic parameters indicates that the densification and the grain growth are related to a mechanism of grain-boundary diffusion and sliding. The densification rate predicted with the evaluated parameters shows a good consistence to the measured rate. In the final stage, the densification rate is inversely proportional to the grain size, and the kinetics is well explained by using the diffusive model modified with a gas pressure in closed pores.

Original languageEnglish
Pages (from-to)357-363
Number of pages7
JournalJournal of the Ceramic Society of Japan
Volume125
Issue number4
DOIs
Publication statusPublished - 2017 Apr 1
Externally publishedYes

Keywords

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

ASJC Scopus subject areas

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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