Sintering kinetics at isothermal shrinkage: II, effect of y 2O3 concentration on the initial sintering stage of fine zirconia powder

Koji Matsui, Kenji Tanaka, Takanori Yamakawa, Masato Uehara, Naoya Enomoto, Junichi Hojo

    研究成果: Contribution to journalArticle査読

    23 被引用数 (Scopus)

    抄録

    The shrinkage behavior of fine zirconia powders containing 2.9 and 7.8 mol% Y2O3 was investigated to clarify the effect of Y 2O3 concentration on the initial sintering stage. The shrinkage of powder compact was measured under both conditions of constant rates of heating (CRH) and constant temperatures. CRH measurements revealed that when the Y2O3 concentration of fine zirconia powder increased, the starting temperature of shrinkage shifted to a high temperature. Isothermal shrinkage measurements revealed that the increase in Y2O3 concentration causes the shrinkage rate to decrease. 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. When the Y2O3 concentration increases, both Q and β0 of diffusion increase. It is, therefore, concluded that the increase in Y2O3 concentration of fine zirconia powder decreases the shrinkage rate because of increasing Q of diffusion at the initial stage of sintering.

    本文言語英語
    ページ(範囲)443-447
    ページ数5
    ジャーナルJournal of the American Ceramic Society
    90
    2
    DOI
    出版ステータス出版済み - 2 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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