Sintering kinetics at constant rates of heating: Effect of alumina on the initial sintering stage of Yttria-stabilized cubic zirconia powder

Koji Matsui, Kenji Tanaka, Naoya Enomoto, Junichi Hojo

Research output: Contribution to journalArticle

22 Citations (Scopus)

Abstract

The sintering behavior of 7.8 mol% Yttria-stabilized cubic stabilized zirconia (Y-CSZ) powders was investigated, with emphasis on the effect of Al2O3 addition at the initial sintering stage. The shrinkage of powder compact was measured under constant rates of heating (CRH). The powder compact with 0.25 mass% Al2O3 enhanced the densification rate with elevating temperature. The activation energies at the initial stage of sintering were determined by analyzing the densification curves. The activation energy of powder compact with Al2O 3 was lower than that of powder compact without Al2O 3. The diffusion mechanisms at the initial sintering stage were determined by the new analytical method applied to the CRH data. This analysis exhibited that the diffusion mechanism changed from grain boundary to volume diffusions (VD) by Al2O3 addition. It is therefore coneluded that the Al2O3 addition enhances the densification rate because of decreasing the activation energy of VD at the initial sintering stage.

Original languageEnglish
Pages (from-to)763-768
Number of pages6
JournalJournal of the Ceramic Society of Japan
Volume114
Issue number1333
DOIs
Publication statusPublished - Jan 1 2006

All Science Journal Classification (ASJC) codes

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

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