Flinn, Brian D. ; Bordia, Rajendra K. ; Zimmermann, André ; Rödel, Jürgen (2000)
Evolution of defect size and strength of porous alumina during sintering.
In: Journal of the European Ceramic Society, 20 (14-15)
doi: 10.1016/S0955-2219(00)00133-3
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
The evolution of fracture strength with increasing density in ceramics, using alumina as a model system, is discussed in terms of the interplay between a defect serving as stress concentrator, a crack lying in its enhanced stress field and the fracture toughness of the porous ceramic. Introduction of crack-free fracture-causing artificial pores of various sizes allows detailed measurement of their shrinkage with ongoing densification, while fractography describes the location and type of fracture initiation. A fracture mechanics model, describing growth of a semicircular crack emanating from the pore until instability, yields good agreement with experiment. In particular, the result that the radius of the artificial, spherical defect in a size regime between 25 and 120 mum has only a small influence on fracture strength for samples with an average grain size smaller than 1 mum, can be explained. (C) 2000 Elsevier Science Ltd. All rights reserved.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2000 |
| Autor(en): | Flinn, Brian D. ; Bordia, Rajendra K. ; Zimmermann, André ; Rödel, Jürgen |
| Art des Eintrags: | Bibliographie |
| Titel: | Evolution of defect size and strength of porous alumina during sintering |
| Sprache: | Englisch |
| Publikationsjahr: | Dezember 2000 |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the European Ceramic Society |
| Jahrgang/Volume einer Zeitschrift: | 20 |
| (Heft-)Nummer: | 14-15 |
| DOI: | 10.1016/S0955-2219(00)00133-3 |
| Kurzbeschreibung (Abstract): | The evolution of fracture strength with increasing density in ceramics, using alumina as a model system, is discussed in terms of the interplay between a defect serving as stress concentrator, a crack lying in its enhanced stress field and the fracture toughness of the porous ceramic. Introduction of crack-free fracture-causing artificial pores of various sizes allows detailed measurement of their shrinkage with ongoing densification, while fractography describes the location and type of fracture initiation. A fracture mechanics model, describing growth of a semicircular crack emanating from the pore until instability, yields good agreement with experiment. In particular, the result that the radius of the artificial, spherical defect in a size regime between 25 and 120 mum has only a small influence on fracture strength for samples with an average grain size smaller than 1 mum, can be explained. (C) 2000 Elsevier Science Ltd. All rights reserved. |
| Freie Schlagworte: | Al2O3; crack growth; mechanical properties; porosity; sintering; GRAIN-SIZE; FRACTURE; PORES; CERAMICS; BEHAVIOR; MODULUS |
| 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: | 14 Jul 2011 11:25 |
| Letzte Änderung: | 05 Mär 2013 09:50 |
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