Langer, Jochen ; Hoffmann, Michael J. ; Guillon, Olivier (2009)
Direct comparison between hot pressing and electric field-assisted sintering of submicron alumina.
In: Acta Materialia, 57 (18)
doi: 10.1016/j.actamat.2009.07.043
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
This study compares hot pressing (HP) and the electric field-assisted sintering technique (FAST) of two different electrically insulating Al2O3 submicron powders with median particle sizes of 150 and 500 nm. Sample geometry, heating schedule, applied pressure and atmosphere were identical for both sintering methods. The densification behavior and characterization of the microstructure revealed that FAST sintered samples reached a higher density compared with HP, in particular for the finer powder. It was found that an increase in dwell time was required to reach the same final density by HP. However, analysis of the sintering curves showed that the densification mechanism for both sintering methods was grain boundary diffusion. Increasing the heating rate up to 150 K min−1 did not modify the densification mechanism. The sintering trajectory showed that the grain size was only dependent on density and was insensitive to the sintering method, in addition to showing a lack of preferential grain orientation.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2009 |
| Autor(en): | Langer, Jochen ; Hoffmann, Michael J. ; Guillon, Olivier |
| Art des Eintrags: | Bibliographie |
| Titel: | Direct comparison between hot pressing and electric field-assisted sintering of submicron alumina |
| Sprache: | Englisch |
| Publikationsjahr: | Oktober 2009 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Acta Materialia |
| Jahrgang/Volume einer Zeitschrift: | 57 |
| (Heft-)Nummer: | 18 |
| DOI: | 10.1016/j.actamat.2009.07.043 |
| Kurzbeschreibung (Abstract): | This study compares hot pressing (HP) and the electric field-assisted sintering technique (FAST) of two different electrically insulating Al2O3 submicron powders with median particle sizes of 150 and 500 nm. Sample geometry, heating schedule, applied pressure and atmosphere were identical for both sintering methods. The densification behavior and characterization of the microstructure revealed that FAST sintered samples reached a higher density compared with HP, in particular for the finer powder. It was found that an increase in dwell time was required to reach the same final density by HP. However, analysis of the sintering curves showed that the densification mechanism for both sintering methods was grain boundary diffusion. Increasing the heating rate up to 150 K min−1 did not modify the densification mechanism. The sintering trajectory showed that the grain size was only dependent on density and was insensitive to the sintering method, in addition to showing a lack of preferential grain orientation. |
| Freie Schlagworte: | Alumina; Electric field-assisted sintering (FAST); Hot pressing (HP); Densification |
| 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: | 20 Jun 2011 10:47 |
| Letzte Änderung: | 05 Mär 2013 09:48 |
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