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 journalArticlepeer-review

    25 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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