Sintering kinetics at isothermal shrinkage: Effect of specific surface area on the initial sintering stage of fine zirconia powder

Koji Matsui, Akira Matsumoto, Masato Uehara, Naoya Enomoto, Junichi Hojo

    研究成果: ジャーナルへの寄稿学術誌査読

    32 被引用数 (Scopus)

    抄録

    The isothermal shrinkage behaviors of fine zirconia powders (containing 2.8-2.9 mol% Y2O3) with specific surface areas of about 6 and 16 m2/g were investigated to clarify the effect of specific surface area on the initial sintering stage. The shrinkage of powder compact was measured under constant temperatures in the range of 1000°-1100°C. The increase in specific surface area enhanced the densification rate with increasing temperature. The values of activation energy (Q) and frequency-factor term (β0) of diffusion at initial sintering were estimated by applying the sintering-rate equation to the isothermal shrinkage data. The Q of diffusion changes little but the β0 increases with the increase in specific surface area. It is therefore concluded that the increase in the specific surface area of fine zirconia powder enhances the shrinkage rate because of an increase in the β0 at the initial stage of sintering.

    本文言語英語
    ページ(範囲)44-49
    ページ数6
    ジャーナルJournal of the American Ceramic Society
    90
    1
    DOI
    出版ステータス出版済み - 1月 2007

    !!!All Science Journal Classification (ASJC) codes

    • セラミックおよび複合材料
    • 材料化学

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