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Rate Equations for Material Transport Driven by Excess Free Energy in Solid

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Abstract:

Diffusion phenomena in solid particles were analyzed with the new material transport concept. It was assumed that total excess free energy in a system acted as a driving force for material transport so that the system changed to an equilibrium state. The new rate equation was adopted to analyze shape change, sintering and growth of grains. It was found that surface energy or ratio of grain boundary energy to surface energy was key factor for shape changes in these processes.

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Periodical:

Key Engineering Materials (Volume 352)

Pages:

1-4

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.352.1

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Online since:

August 2007

Authors:

Hidehiko Tanaka

Keywords:

Free Energy, Material Transport, Rate Equation, Sintering, Theory

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© 2007 Trans Tech Publications Ltd. All Rights Reserved

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References

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[4] Y. Uemura, Y. Inomata, Z. Inoue, J. Mat. Sci., 16, 2333-2335 (1981). Fig. 4 Free energy change during sintering, α =εgb/εsf. Fig. 5 Sintering behavior of two contacting grains. B=(3εsfDVm/RTr01 3 ), α =εgb/εsf.

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