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J. Korean Ceram. Soc. > Volume 61(3); 2024 > Article
Journal of the Korean Ceramic Society 2024;61(3): 458-468.
doi: https://doi.org/10.1007/s43207-023-00364-8
Curvature reversal condition during pore shrinkage or fragmentation
Yeong-Kyeun Paek, Kyung-Sik Oh
School of Advanced Materials and Electrical Engineering, Industrial Technology Center for Environment-Friendly Materials, Andong National University, 1375 Gyeongdong-ro, Andong 36729, Korea
Correspondence  Kyung-Sik Oh ,Email: ksoh@andong.ac.kr
Received: July 28, 2023; Revised: December 2, 2023   Accepted: December 17, 2023.  Published online: February 20, 2024.
ABSTRACT
Pore shrinkage is caused by sintering pressure, and is affected by the curvature of the grains within the surface of pores, as well as variables, like grain size, pore radius, and dihedral angle. The sintering pressure is greatly influenced by the direction of curvature of grains within the pores, which, during the shrinkage of the pore, is sometimes reversed; this is termed curvature reversal. This research aimed to present the curvature reversal condition by means of a geometrical model, and thus the radius of curvature of a grain surface within the pore was calculated according to the dihedral angle assuming a grain size of 0.1–0.3 μm and pore radius of 500 μm. Calculation of the pore shrinkage showed that the sign of the radius of curvature changed along with the rapid increase in absolute value, so this was physically interpreted as curvature reversal. This curvature reversal was observed in the process of shrinking pores, as well as in the change of dihedral angle; the larger the grain and the dihedral angle, the larger the pore radius at which reversal occurred. This paper presents the conditions of curvature reversal during the sintering of powder compact according to the dihedral angle, grain size, and pore size, and discusses the implications for actual sintering.
Key words: Curvature reversal  · Sintering pressure  · Fragmentation  · Pore shrinkage  · Dihedral angle
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