Phase-transformation and grain-growth kinetics in yttria-stabilized tetragonal zirconia polycrystal doped with a small amount of alumina

Koji Matsui, Hidehiro Yoshida, Yuichi Ikuhara

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    32 Citations (Scopus)

    Abstract

    Microstructure development during sintering in 3 mol% Y2O3-stabilized tetragonal zirconia polycrystal doped with a small amount of Al2O3 was investigated in the isothermal sintering conditions of 1300-1500 °C. At the low sintering temperature at 1300 °C, although the density was relatively high, the grain-growth rate was much slow. In the specimen sintered at 1300 °C for 50 h, Y3+ and Al3+ ions segregated along grain boundaries within the widths of about 10 and 6 nm, respectively. In grain interiors, the cubic-phase regions were formed by not only a grain-boundary segregation-induced phase-transformation mechanism but also by spinodal decomposition. The grain-growth behavior was kinetically analyzed using the grain-size data in 1300-1500 °C, which indicated that the grain-growth rate was enhanced by Al2O3-doping. These phase-transformation and grain-growth behaviors are reasonably explained by the diffusion-enhanced effect of Al2O3-doping.

    Original languageEnglish
    Pages (from-to)1679-1690
    Number of pages12
    JournalJournal of the European Ceramic Society
    Volume30
    Issue number7
    DOIs
    Publication statusPublished - 2010 May 1

    Keywords

    • AlO
    • Diffusion
    • Grain growth
    • Grain-boundary segregation-induced phase-transformation
    • ZrO

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Materials Chemistry

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