Cubic-formation and grain-growth mechanisms in tetragonal zirconia polycrystal

Koji Matsui, Hideharu Horikoshi, Nobukatsu Ohmichi, Michiharu Ohgai, Hidehiro Yoshida, Yuichi Ikuhara

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    The microstructure in Y2O3-stabilized tetragonal zirconia polycrystal (Y-TZP) sintered at 1300°-1500°C was examined to clarify the role of Y3+ ions on grain growth and the formation of cubic phase. The grain size and the fraction of the cubic phase in Y-TZP increased as the sintering temperature increased. Both the fraction of the tetragonal phase and the Y2O3 concentration within the tetragonal phase decreased with increasing fraction of the cubic phase. Scanning transmission electron microscopy (SEM) and X-ray energy dispersive spectroscopy (EDS) measurements revealed that cubic phase regions in grain interiors in Y-TZP generated as the sintering temperature increased. High-resolution electron microscopy and nanoprobe EDS measurements revealed that no amorphous layer or second phase existed along the grain-boundary faces in Y-TZP and Y3+ ions segregated at their grain boundaries over a width of ∼10 nm. Taking into account these results, it was clarified that cubic phase regions in grain interiors started to form from grain boundaries and the triple junctions in which Y3+ ions segregated. The cubic-formation and grain-growth mechanisms in Y-TZP can be explained using the grain boundary segregation-induced phase transformation model and the solute drag effect of Y3+ ions segregating along the grain boundary, respectively.

    元の言語English
    ページ(範囲)1401-1408
    ページ数8
    ジャーナルJournal of the American Ceramic Society
    86
    発行部数8
    DOI
    出版物ステータスPublished - 2003 8

    ASJC Scopus subject areas

    • Ceramics and Composites
    • Materials Chemistry

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