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

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

*この研究の対応する著者

研究成果: Article査読

5 被引用数 (Scopus)

抄録

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.

本文言語English
ページ(範囲)1359-1365
ページ数7
ジャーナルJournal of the European Ceramic Society
39
4
DOI
出版ステータスPublished - 2019 4
外部発表はい

ASJC Scopus subject areas

  • セラミックおよび複合材料
  • 材料化学

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