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Electric Field-Assisted Sintering of Gadolinium-Doped Ceria: Sintering and Grain Growth Kinetics

S. K. Sistla, T. Mishra, Y. Deng, A. Kaletsch, M. Bram, C. Broeckmann

Journal of Ceramic Science and Technology, Vol. 11, No. 1 (2020), pp. 17-26

DOI: 10.4416/JCST2019-00045

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Abstract

The densification and grain growth kinetics during field-assisted sintering of gadolinium-doped (10 mol%) ceria (GDC10) were analyzed by conducting isothermal sintering experiments. The model parameters, namely, a stress exponent of ∼ 2 and apparent activation energy of ∼ 260 kJ/mol for the densification have been determined experimentally. Subsequently, the grain growth has been described by a power law with an exponent of 2 and an activation energy of ∼ 200 kJ/mol. Such values suggest that the dominating densification mechanism combines both diffusion and dislocation motion. A numerical model has been utilized to predict the densification curves, which show a satisfactory fit with the experimental curves. Particularly, it has been shown that grain growth kinetics, explicitly, needs to be taken into account in the densification models, to accurately predict the shrinkage during sintering.

Keywords

Field-assisted sintering technology (FAST), gadolinium-doped ceria, modeling, densification, grain growth

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