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: ジャーナルへの寄稿記事

20 引用 (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.

元の言語英語
ページ(範囲)443-447
ページ数5
ジャーナルJournal of the American Ceramic Society
90
発行部数2
DOI
出版物ステータス出版済み - 2 1 2007

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Zirconia
Powders
Sintering
kinetics
Kinetics
heating
Heating
zirconium oxide
effect
sintering
activation energy
Temperature
Activation energy
temperature
rate

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

これを引用

Sintering kinetics at isothermal shrinkage : II, effect of y 2O3 concentration on the initial sintering stage of fine zirconia powder. / Matsui, Koji; Tanaka, Kenji; Yamakawa, Takanori; Uehara, Masato; Enomoto, Naoya; Hojo, Junichi.

:: Journal of the American Ceramic Society, 巻 90, 番号 2, 01.02.2007, p. 443-447.

研究成果: ジャーナルへの寄稿記事

Matsui, Koji ; Tanaka, Kenji ; Yamakawa, Takanori ; Uehara, Masato ; Enomoto, Naoya ; Hojo, Junichi. / Sintering kinetics at isothermal shrinkage : II, effect of y 2O3 concentration on the initial sintering stage of fine zirconia powder. :: Journal of the American Ceramic Society. 2007 ; 巻 90, 番号 2. pp. 443-447.
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abstract = "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.",
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AU - Uehara, Masato

AU - Enomoto, Naoya

AU - Hojo, Junichi

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