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J. Korean Ceram. Soc. > Volume 43(11); 2006 > Article
Journal of the Korean Ceramic Society 2006;43(11): 728.
doi: https://doi.org/10.4191/kcers.2006.43.11.728
Effect of Crystal Shape on the Grain Growth during Liquid Phase Sintering of Ceramics
Wook Jo, Nong-Moon Hwang1, Doh-Yeon Kim
Department of Materials Science and Engineering, Seoul National University
1National Research Laboratory of Charged Nanoparticles, Seoul National University
The equilibrium or growth shape of ceramic materials is classified largely into two categories according to the thermodynamic conditions imposed. One is a polyhedral shape where the surface free energy is anisotropic, and the other a spherical shape where the surface free energy is isotropic. In the case of grains with a polyhedral shape of anisotropic surface free energy, socalled abnormal grain growth usually takes place due to a significant energy barrier for a growth unit to be attached to the crystal surface. In the case of grains with a spherical shape of isotropic surface free energy, however, normal grain growth with a uniform size distribution takes place. In this contribution, the state-of-the-art of our current understanding of the relationship between the crystal shape and the microstructure evolution during the sintering of ceramic materials in the presence of a liquid phase was discussed.
Key words: Liquid phase sintering, Grain growth, Crystal shape, Surface free energy, Interface structure
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