Rödel, Jürgen ; Glaeser, Andreas M. (1990)
Pore Drag and Pore-Boundary Separation in Alumina.
In: Journal of the American Ceramic Society, 73 (11)
doi: 10.1111/j.1151-2916.1990.tb06453.x
Artikel, Bibliographie
Kurzbeschreibung (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.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 1990 |
| Autor(en): | Rödel, Jürgen ; Glaeser, Andreas M. |
| Art des Eintrags: | Bibliographie |
| Titel: | Pore Drag and Pore-Boundary Separation in Alumina |
| Sprache: | Englisch |
| Publikationsjahr: | November 1990 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the American Ceramic Society |
| Jahrgang/Volume einer Zeitschrift: | 73 |
| (Heft-)Nummer: | 11 |
| DOI: | 10.1111/j.1151-2916.1990.tb06453.x |
| Kurzbeschreibung (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. |
| Freie Schlagworte: | alumina; grain growth; pores; magnesia; models |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Nichtmetallisch-Anorganische Werkstoffe 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 13 Jun 2012 12:12 |
| Letzte Änderung: | 05 Mär 2013 10:01 |
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