Sintering kinetics at constant rates of heating: Effect of Al 2O 3 on the initial sintering stage of fine zirconia powder

Koji Matsui, Nobukatsu Ohmichi, Michiharu Ohgai, Naoya Enomoto, Junichi Hojo

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    67 Citations (Scopus)

    Abstract

    The sinterabilities of fine zirconia powders including 5 mass% Y2O3 were investigated, with emphasis on the effect of Al2O3 at the initial sintering stage. The shrinkage of powder compact was measured under constant rates of heating (CRH). The powder compact including a small amount of Al2O3 increased 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 including Al2O3 was lower than that of a powder compact without Al2O3. The diffusion mechanisms at the initial sintering stage were determined using the new analytical equation applied for CRH techniques. This analysis exhibited that Al2O3 included in a powder compact changed the diffusion mechanism from grain boundary to volume diffusions (VD). Therefore, it is concluded that the effect of Al2O3 enhanced the densification rate because of decrease in the activation energy of VD at the initial sintering stage.

    Original languageEnglish
    Pages (from-to)3346-3352
    Number of pages7
    JournalJournal of the American Ceramic Society
    Volume88
    Issue number12
    DOIs
    Publication statusPublished - Dec 1 2005

    All Science Journal Classification (ASJC) codes

    • Ceramics and Composites
    • Materials Chemistry

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