Simulation of densification behavior of nano-powder in final sintering stage: Effect of pore-size distribution |
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Authors: | Byung-Nam Kim Koji Morita Tohru S Suzuki Ji-Guang Li Hideaki Matsubara |
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Affiliation: | 1. National Institute for Materials Science, 1-2-1 Sengen, Tsukuba, Ibaraki, 305-0047, Japan;2. Tohoku University, 6-6 Aoba, Aramaki, Aoba-ku, Sendai, 980-8579, Japan |
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Abstract: | In the final sintering stage, nano-sized powder frequently forms a pore structure where most pores are surrounded by more than 5 grains. The pore structure is different from that of coarse powder. In this study, the densification behavior of nano-sized powder is modelled and simulated in the final sintering stage. The porous body has the initial size distribution of pores, represented as a Weibull function. The mechanical interaction between pores is analyzed to simulate the evolution of porosity characteristics as well as densification kinetics. The densification rate for the size-distributed pores is lower than that for single-sized ones. The experimental relationship between the densification rate and the porosity could well be reproduced by choosing appropriate pore-size distributions. The simulation also shows that the sintering stress with densification may increase or decrease depending on the size distribution, but is remarkably lower than that for single-sized pores. |
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Keywords: | Sintering Porosity Simulation Densification kinetics: pore-size distribution |
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