Theoretical analysis of experimental densification kinetics in final sintering stage of nano-sized zirconia

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

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2 Citations (Scopus)

Abstract

The experimental densification kinetics of 7.8 mol% Y2O3-stabilized zirconia was analyzed theoretically during isothermal sintering in the final stage. By taking concurrent grain growth into account, a possible value of the grain-size exponent n was examined. The Coble's corner-pore model recognized widely was found not to be applicable for explaining the densification kinetics. The corner-pore model of n = 4 shows a significant divergence in the kinetics at different temperatures. Microstructural observation shows that most pores are not located at grain corners and have a size comparable to the surrounding grains. The observed pore structure is similar to the diffusive model where single pore is surrounded by dense body. The diffusive model combined with theoretical sintering stress predicts n = 1 or n = 2, which shows a good consistence to the measured densification kinetics. During sintering of nano-sized powder, it is found that the densification kinetics can be explained distinctively by the diffusive single-pore model.

Original languageEnglish
Pages (from-to)1359-1365
Number of pages7
JournalJournal of the European Ceramic Society
Volume39
Issue number4
DOIs
Publication statusPublished - 2019 Apr 1
Externally publishedYes

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Keywords

  • Densification
  • Grain-growth
  • Kinetics
  • Pore structure
  • Sintering

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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