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Pore Drag and Pore-Boundary Separation in Alumina

Rödel, Jürgen and Glaeser, Andreas M. (1990):
Pore Drag and Pore-Boundary Separation in Alumina.
In: Journal of the American Ceramic Society, pp. 3302-3312, 73, (11), ISSN 0002-7820,
[Online-Edition: http://dx.doi.org/10.1111/j.1151-2916.1990.tb06453.x],
[Article]

Abstract

Microdesigned interfacial pore structures were used to study pore drag and pore-boundary separation in Al2O3. This approach allows the creation of pore arrays containing pores of controlled size and spacing at well-defined singlecrystal seed/polycrystalline matrix interfaces, and enables experimental determination of the peak pore velocity. From the peak pore velocity, values of the surface diffusion coefficient pertinent to sintering can be extracted. At 1600°C, the surface diffusion coefficient is ∼1 × 10−7 cm2/s for undoped Al2O3 and ∼4 × 10−7 cm2/s for MgO-doped Al2O3. The values appear to be insensitive to the seed orientation for the two seed orientations studied. The results suggest a strong influence of pore spacing on the separation condition in undoped Al2O3, and a diminished influence in MgO-doped Al2O3. Quantitative agreement between theoretically predicted and experimentally observed separation/attachment conditions was obtained.

Item Type: Article
Erschienen: 1990
Creators: Rödel, Jürgen and Glaeser, Andreas M.
Title: Pore Drag and Pore-Boundary Separation in Alumina
Language: English
Abstract:

Microdesigned interfacial pore structures were used to study pore drag and pore-boundary separation in Al2O3. This approach allows the creation of pore arrays containing pores of controlled size and spacing at well-defined singlecrystal seed/polycrystalline matrix interfaces, and enables experimental determination of the peak pore velocity. From the peak pore velocity, values of the surface diffusion coefficient pertinent to sintering can be extracted. At 1600°C, the surface diffusion coefficient is ∼1 × 10−7 cm2/s for undoped Al2O3 and ∼4 × 10−7 cm2/s for MgO-doped Al2O3. The values appear to be insensitive to the seed orientation for the two seed orientations studied. The results suggest a strong influence of pore spacing on the separation condition in undoped Al2O3, and a diminished influence in MgO-doped Al2O3. Quantitative agreement between theoretically predicted and experimentally observed separation/attachment conditions was obtained.

Journal or Publication Title: Journal of the American Ceramic Society
Volume: 73
Number: 11
Uncontrolled Keywords: alumina; grain growth; pores; magnesia; models
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Nonmetallic-Inorganic Materials
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 13 Jun 2012 12:12
Official URL: http://dx.doi.org/10.1111/j.1151-2916.1990.tb06453.x
Identification Number: doi:10.1111/j.1151-2916.1990.tb06453.x
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