Journal
JOURNAL OF THE KOREAN CERAMIC SOCIETY
Volume 43, Issue 11, Pages 728-733Publisher
KOREAN CERAMIC SOC
DOI: 10.4191/kcers.2006.43.11.728
Keywords
Liquid phase sintering; Grain growth; Crystal shape; Surface free energy; Interface structure
Categories
Funding
- Korea Office of Science and Engineering through the National Research Laboratory program
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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, so-called 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.
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