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Newtonian Viscosity of Amorphous Silicon Carbonitride at High Temperature

An, Linan ; Riedel, Ralf ; Konetschny, Christoph ; Kleebe, Hans-Joachim ; Raj, Rishi (1998)
Newtonian Viscosity of Amorphous Silicon Carbonitride at High Temperature.
In: Journal of the American Ceramic Society, 81 (5)
doi: 10.1111/j.1151-2916.1998.tb02489.x
Artikel, Bibliographie

Kurzbeschreibung (Abstract)

The creep viscosity of chemical-precursor-derived silicon carbonitride (SiCN), which is known to remain predominantly amorphous at temperatures below 1400°C, was measured in the temperature range 1090-1280°C. Experiments were done in uniaxial compression at constant loads in pure nitrogen atmosphere. The creep behavior exhibited three stages. In stage I the strain rate decreased rapidly with time and deformation was accompanied by densification. In stage II the samples exhibited a steady-state creep rate. In stage III, which commenced after long-term deformation, creep gradually declined to rates that were below the sensitivity of our apparatus. The relative density of the specimens during stage II and stage III remained constant at ≅2.3 g/cm3. The shear viscosity in stage II was nearly Newtonian and was measured to be 1.3 × 1013-5.0 1013 Pa·s at 1280°C, which is approximately 103 times the value for fused silica. The creep-hardened as well as uncrept specimens contained silicon nitride crystallites. The volume fraction of these crystals was variable but always less than 5%. Such a small volume fraction of crystals does not explain the dramatic creep-hardening behavior in stage III, even if it is assumed that the crystals formed during creep deformation in stage II.

Typ des Eintrags: Artikel
Erschienen: 1998
Autor(en): An, Linan ; Riedel, Ralf ; Konetschny, Christoph ; Kleebe, Hans-Joachim ; Raj, Rishi
Art des Eintrags: Bibliographie
Titel: Newtonian Viscosity of Amorphous Silicon Carbonitride at High Temperature
Sprache: Englisch
Publikationsjahr: Mai 1998
Verlag: Wiley
Titel der Zeitschrift, Zeitung oder Schriftenreihe: Journal of the American Ceramic Society
Jahrgang/Volume einer Zeitschrift: 81
(Heft-)Nummer: 5
DOI: 10.1111/j.1151-2916.1998.tb02489.x
Kurzbeschreibung (Abstract):

The creep viscosity of chemical-precursor-derived silicon carbonitride (SiCN), which is known to remain predominantly amorphous at temperatures below 1400°C, was measured in the temperature range 1090-1280°C. Experiments were done in uniaxial compression at constant loads in pure nitrogen atmosphere. The creep behavior exhibited three stages. In stage I the strain rate decreased rapidly with time and deformation was accompanied by densification. In stage II the samples exhibited a steady-state creep rate. In stage III, which commenced after long-term deformation, creep gradually declined to rates that were below the sensitivity of our apparatus. The relative density of the specimens during stage II and stage III remained constant at ≅2.3 g/cm3. The shear viscosity in stage II was nearly Newtonian and was measured to be 1.3 × 1013-5.0 1013 Pa·s at 1280°C, which is approximately 103 times the value for fused silica. The creep-hardened as well as uncrept specimens contained silicon nitride crystallites. The volume fraction of these crystals was variable but always less than 5%. Such a small volume fraction of crystals does not explain the dramatic creep-hardening behavior in stage III, even if it is assumed that the crystals formed during creep deformation in stage II.

Fachbereich(e)/-gebiet(e): 11 Fachbereich Material- und Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Geowissenschaften
11 Fachbereich Material- und Geowissenschaften > Geowissenschaften > Fachgebiet Geomaterialwissenschaft
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft
11 Fachbereich Material- und Geowissenschaften > Materialwissenschaft > Fachgebiet Disperse Feststoffe
Hinterlegungsdatum: 15 Nov 2012 09:14
Letzte Änderung: 12 Aug 2021 11:52
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Sponsoren: Supported by the North Atlantic Treaty Organization, and partially by a grant from the Division of Materials Research at the National Science Foundation (DMR-9796100).
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