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

Research output: Contribution to journalArticle

19 Citations (Scopus)

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.

Original languageEnglish
Pages (from-to)443-447
Number of pages5
JournalJournal of the American Ceramic Society
Volume90
Issue number2
DOIs
Publication statusPublished - Feb 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
  • Geology
  • Geochemistry and Petrology
  • Materials Chemistry

Cite this

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.

In: Journal of the American Ceramic Society, Vol. 90, No. 2, 01.02.2007, p. 443-447.

Research output: Contribution to journalArticle

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. In: Journal of the American Ceramic Society. 2007 ; Vol. 90, No. 2. pp. 443-447.
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