Ostwald ripening kinetics of angular grains dispersed in a liquid phase by two-dimensional nucleation and abnormal grain growth |
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| Affiliation: | 1. Center for Microstructure Science of Materials, School of Materials Science and Engineering, Seoul National University, Seoul 151-742, South Korea;2. Korea Research Institute of Standards and Science, PO Box 102, Taejon, 305-600, South Korea;1. State Key Laboratory of Solidification Processing, School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, China;2. Xi’an Chuang Lian Capacitor Co., Ltd., Xi’an 710065, China;1. Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea;2. Samsung Electronics Co., Ltd., Hwasung 18448, Republic of Korea;3. Department of Physics, University of Ulsan, Ulsan 44610, Republic of Korea;4. Graduate School of EEWS, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea;5. Korea Institute of Ceramic Engineering and Technology, Jinju 52851, Republic of Korea |
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| Abstract: | Based on the fact that the angular shape of solid grains dispersed in the liquid matrix indicates a singular interface, the coarsening kinetics of angular grains was formulated based on 2-dimensional (2-D) nucleation and solved numerically. For comparison, diffusion-controlled coarsening of grains with a spherical shape was also solved numerically. The solutions showed that coarsening by 2-D nucleation induced abnormal grain growth whilst diffusion-controlled coarsening did not. This result agrees with the general experimental observation that the abnormal grain growth in liquid phase sintering takes place exclusively in the system with angular grains. The ratio of the largest grain size to the average increased monotonously with time in coarsening by 2-D nucleation whilst it decreased in diffusion-controlled coarsening. The artificially-added large grain (10 times larger than the average) became the abnormal grain in 2-D nucleation controlled coarsening but did not in diffusion-controlled coarsening. |
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