Sintering kinetics at constant rates of heating: Effect of Al 2O 3 on the initial sintering stage of fine zirconia powder

Koji Matsui, Nobukatsu Ohmichi, Michiharu Ohgai, Naoya Enomoto, Junichi Hojo

研究成果: ジャーナルへの寄稿記事

53 引用 (Scopus)

抄録

The sinterabilities of fine zirconia powders including 5 mass% Y2O3 were investigated, with emphasis on the effect of Al2O3 at the initial sintering stage. The shrinkage of powder compact was measured under constant rates of heating (CRH). The powder compact including a small amount of Al2O3 increased the densification rate with elevating temperature. The activation energies at the initial stage of sintering were determined by analyzing the densification curves. The activation energy of powder compact including Al2O3 was lower than that of a powder compact without Al2O3. The diffusion mechanisms at the initial sintering stage were determined using the new analytical equation applied for CRH techniques. This analysis exhibited that Al2O3 included in a powder compact changed the diffusion mechanism from grain boundary to volume diffusions (VD). Therefore, it is concluded that the effect of Al2O3 enhanced the densification rate because of decrease in the activation energy of VD at the initial sintering stage.

元の言語英語
ページ(範囲)3346-3352
ページ数7
ジャーナルJournal of the American Ceramic Society
88
発行部数12
DOI
出版物ステータス出版済み - 12 1 2005

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Zirconia
Powders
Sintering
Heating
Kinetics
Densification
Activation energy
zirconium oxide
Grain boundaries
Temperature

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Materials Chemistry

これを引用

Sintering kinetics at constant rates of heating : Effect of Al 2O 3 on the initial sintering stage of fine zirconia powder. / Matsui, Koji; Ohmichi, Nobukatsu; Ohgai, Michiharu; Enomoto, Naoya; Hojo, Junichi.

:: Journal of the American Ceramic Society, 巻 88, 番号 12, 01.12.2005, p. 3346-3352.

研究成果: ジャーナルへの寄稿記事

Matsui, Koji ; Ohmichi, Nobukatsu ; Ohgai, Michiharu ; Enomoto, Naoya ; Hojo, Junichi. / Sintering kinetics at constant rates of heating : Effect of Al 2O 3 on the initial sintering stage of fine zirconia powder. :: Journal of the American Ceramic Society. 2005 ; 巻 88, 番号 12. pp. 3346-3352.
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abstract = "The sinterabilities of fine zirconia powders including 5 mass{\%} Y2O3 were investigated, with emphasis on the effect of Al2O3 at the initial sintering stage. The shrinkage of powder compact was measured under constant rates of heating (CRH). The powder compact including a small amount of Al2O3 increased the densification rate with elevating temperature. The activation energies at the initial stage of sintering were determined by analyzing the densification curves. The activation energy of powder compact including Al2O3 was lower than that of a powder compact without Al2O3. The diffusion mechanisms at the initial sintering stage were determined using the new analytical equation applied for CRH techniques. This analysis exhibited that Al2O3 included in a powder compact changed the diffusion mechanism from grain boundary to volume diffusions (VD). Therefore, it is concluded that the effect of Al2O3 enhanced the densification rate because of decrease in the activation energy of VD at the initial sintering stage.",
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