Galusek, Dušan ; Sedláček, Jaroslav ; Švančárek, Peter ; Riedel, Ralf ; Satet, Raphaelle ; Hoffmann, Michael (2007)
The influence of post-sintering HIP on the microstructure, hardness, and indentation fracture toughness of polymer-derived Al2O3–SiC nanocomposites.
In: Journal of the European Ceramic Society, 27 (2-3)
doi: 10.1016/j.jeurceramsoc.2006.04.028
Artikel, Bibliographie
Kurzbeschreibung (Abstract)
Al2O3–SiC nanocomposites containing 3–8 vol.% SiC were prepared from fine α-alumina powder and a poly(allyl)carbosilane precursor of SiC by polymer infiltration of porous alumina matrix (composites IP), or by warm pressing of polymer-coated alumina powder (composites CW). The polymer was converted to SiC by careful heating of green specimens in inert atmosphere (Ar). The residual porosity was eliminated to less than 10% by pressureless sintering (PS) at temperatures between 1700 and 1850 °C. The post-sintering hot isostatic pressing (HIP) at 1700 °C eliminated the residual porosity to less than 1%, but also resulted in coarsening of the alumina matrix grains, and the inter- and intragranular SiC inclusions. The Vickers hardness of IP specimens sintered at T < 1850 °C increased by 1–10%, which is attributed to elimination of residual porosity. The hardness and indentation fracture toughness of specimens IP sintered at 1850 °C decreased after HIP by 6 and 15%, respectively. The HIP of CW composites increased their hardness and fracture toughness by approximately 10%. The maximum fracture toughness of 5.2 ± 0.2 MPa m1/2 was measured for the materials containing 8 vol.% of SiC. A correlation was found between the fracture toughness, and the mean size and volume fraction of intergranular SiC inclusions in composites CW.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2007 |
| Autor(en): | Galusek, Dušan ; Sedláček, Jaroslav ; Švančárek, Peter ; Riedel, Ralf ; Satet, Raphaelle ; Hoffmann, Michael |
| Art des Eintrags: | Bibliographie |
| Titel: | The influence of post-sintering HIP on the microstructure, hardness, and indentation fracture toughness of polymer-derived Al2O3–SiC nanocomposites |
| Sprache: | Englisch |
| Publikationsjahr: | 2007 |
| Verlag: | SciVerse |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of the European Ceramic Society |
| Jahrgang/Volume einer Zeitschrift: | 27 |
| (Heft-)Nummer: | 2-3 |
| DOI: | 10.1016/j.jeurceramsoc.2006.04.028 |
| Kurzbeschreibung (Abstract): | Al2O3–SiC nanocomposites containing 3–8 vol.% SiC were prepared from fine α-alumina powder and a poly(allyl)carbosilane precursor of SiC by polymer infiltration of porous alumina matrix (composites IP), or by warm pressing of polymer-coated alumina powder (composites CW). The polymer was converted to SiC by careful heating of green specimens in inert atmosphere (Ar). The residual porosity was eliminated to less than 10% by pressureless sintering (PS) at temperatures between 1700 and 1850 °C. The post-sintering hot isostatic pressing (HIP) at 1700 °C eliminated the residual porosity to less than 1%, but also resulted in coarsening of the alumina matrix grains, and the inter- and intragranular SiC inclusions. The Vickers hardness of IP specimens sintered at T < 1850 °C increased by 1–10%, which is attributed to elimination of residual porosity. The hardness and indentation fracture toughness of specimens IP sintered at 1850 °C decreased after HIP by 6 and 15%, respectively. The HIP of CW composites increased their hardness and fracture toughness by approximately 10%. The maximum fracture toughness of 5.2 ± 0.2 MPa m1/2 was measured for the materials containing 8 vol.% of SiC. A correlation was found between the fracture toughness, and the mean size and volume fraction of intergranular SiC inclusions in composites CW. |
| Freie Schlagworte: | Hot isostatic pressing, Precursors-organic, Microstructure-final, Mechanical properties, Al2O3–SiC |
| Fachbereich(e)/-gebiet(e): | 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe 11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft 11 Fachbereich Material- und Geowissenschaften |
| Hinterlegungsdatum: | 17 Apr 2012 09:32 |
| Letzte Änderung: | 05 Mär 2013 10:00 |
| PPN: | |
| Sponsoren: | The financial support of this work by the Alexander von Humboldt Foundation, Bonn, Germany, by the grant number O051/03R80600/03R0603, and by the Slovak National Grant Agency VEGA, under the contract number 2/3101/23, is gratefully acknowledged. |
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