Evaluation of densification and grain-growth behavior during isothermal sintering of zirconia

The densification behavior during the isothermal sintering of 7.8 mol % Y2O3-stabilized zirconia was examined in the intermediate and final stages of sintering. In the intermediate stage, it is shown that the relationship between the grain size and the relative density is not invariant, but is tempe...

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Bibliographic Details
Published in:Journal of the Ceramic Society of Japan 2017/04/01, Vol.125(4), pp.357-363
Main Authors: KIM, Byung-Nam, SUZUKI, Tohru S., MORITA, Koji, YOSHIDA, Hidehiro, LI, Ji-Guang, MATSUBARA, Hideaki
Format: Article
Language:English
Subjects:
Activation energy
Densification
Density
Diffusion rate
Gas pressure
Grain growth
Grain size
Kinetics
Parameters
Sintering
Sintering (powder metallurgy)
Temperature dependence
Yttria-stabilized zirconia
Zirconium dioxide
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Summary:The densification behavior during the isothermal sintering of 7.8 mol % Y2O3-stabilized zirconia was examined in the intermediate and final stages of sintering. In the intermediate stage, it is shown that the relationship between the grain size and the relative density is not invariant, but is temperature dependent. The relationship is combined with the measured densification rate to evaluate the grain size exponent, the activation energy and an unspecified function of density. The evaluation of the characteristic parameters indicates that the densification and the grain growth are related to a mechanism of grain-boundary diffusion and sliding. The densification rate predicted with the evaluated parameters shows a good consistence to the measured rate. In the final stage, the densification rate is inversely proportional to the grain size, and the kinetics is well explained by using the diffusive model modified with a gas pressure in closed pores.
ISSN:1882-0743
1348-6535
DOI:10.2109/jcersj2.16306