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A model of diffusion/viscous mass transport in silicates during liquid-phase sintering

Published online by Cambridge University Press:  03 March 2011

J.W. Nowok
J.W. Nowok
Affiliation:
Fuels and Materials Science, University of North Dakota, Energy and Environmental Research Center, Box 8213, University Station, Grand Forks, North Dakota 58202
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Abstract

The model of capillary transport of liquid metals driven by shear stress resulting from the displacement of menisci [J.W. Nowok, Scripta Metal]. Mater. 29, 931 (1993); Acta Metall. Mater. 42, 4025 (1994)] is applicable to liquid-phase sintering of silicate/aluminosilicate glasses. The movement of a liquid phase between adjacent particles is compared with that in capillaries. It appears that the transport property of intergranular melt may be expressed by the viscosity (η) and volume diffusion (D) parameters if mean displacement of menisci is compared with the mean diffusive jump lengths of atoms/molecules (L). This leads to the following relation: (γ/η)Lα = Dcap, where α and Dcap are a specific permeability and volume diffusion coefficient. The use of this model requires the assumption that the diffusing species are also the viscous flow units, and they can be either atoms or structural units. This assumption seems to be applicable for depolymerized silicate melts if the dominant mass transport is initiated by the diffusion of both nonbridging oxygen and silicon atoms.

Type
Articles
Information
Journal of Materials Research , Volume 10 , Issue 2 , February 1995 , pp. 401 - 404
Copyright
Copyright © Materials Research Society 1995

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References

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