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High-Temperature Creep Behavior of Dense SiOC-Based Ceramic Nanocomposites: Microstructural and Phase Composition Effects

Papendorf, Benjamin and Ionescu, Emanuel and Kleebe, Hans-Joachim and Linck, Christoph and Guillon, Olivier and Nonnenmacher, Katharina and Riedel, Ralf and Wakai, F. (2013):
High-Temperature Creep Behavior of Dense SiOC-Based Ceramic Nanocomposites: Microstructural and Phase Composition Effects.
In: Journal of the American Ceramic Society, 96 (1), WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim, pp. 272-280, ISSN 00027820,
DOI: 10.1111/jace.12067,
[Online-Edition: http://dx.doi.org/10.1111/jace.12067],
[Article]

Abstract

In this work, dense monolithic polymer‐derived ceramic nanocomposites (SiOC, SiZrOC, and SiHfOC) were synthesized via hot‐pressing techniques and were evaluated with respect to their compression creep behavior at temperatures beyond 1000°C. The creep rates, stress exponents as well as activation energies were determined. The high‐temperature creep in all materials has been shown to rely on viscous flow. In the quaternary materials (i.e., SiZrOC and SiHfOC), higher creep rates and activation energies were determined as compared to those of monolithic SiOC. The increase in the creep rates upon modification of SiOC with Zr/Hf relies on the significant decrease in the volume fraction of segregated carbon; whereas the increase of the activation energies corresponds to an increase of the size of the silica nanodomains upon Zr/Hf modification. Within this context, a model is proposed, which correlates the phase composition as well as network architecture of the investigated samples with their creep behavior and agrees well with the experimentally determined data.

Item Type: Article
Erschienen: 2013
Creators: Papendorf, Benjamin and Ionescu, Emanuel and Kleebe, Hans-Joachim and Linck, Christoph and Guillon, Olivier and Nonnenmacher, Katharina and Riedel, Ralf and Wakai, F.
Title: High-Temperature Creep Behavior of Dense SiOC-Based Ceramic Nanocomposites: Microstructural and Phase Composition Effects
Language: English
Abstract:

In this work, dense monolithic polymer‐derived ceramic nanocomposites (SiOC, SiZrOC, and SiHfOC) were synthesized via hot‐pressing techniques and were evaluated with respect to their compression creep behavior at temperatures beyond 1000°C. The creep rates, stress exponents as well as activation energies were determined. The high‐temperature creep in all materials has been shown to rely on viscous flow. In the quaternary materials (i.e., SiZrOC and SiHfOC), higher creep rates and activation energies were determined as compared to those of monolithic SiOC. The increase in the creep rates upon modification of SiOC with Zr/Hf relies on the significant decrease in the volume fraction of segregated carbon; whereas the increase of the activation energies corresponds to an increase of the size of the silica nanodomains upon Zr/Hf modification. Within this context, a model is proposed, which correlates the phase composition as well as network architecture of the investigated samples with their creep behavior and agrees well with the experimentally determined data.

Journal or Publication Title: Journal of the American Ceramic Society
Volume: 96
Number: 1
Publisher: WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Divisions: 11 Department of Materials and Earth Sciences
11 Department of Materials and Earth Sciences > Earth Science
11 Department of Materials and Earth Sciences > Earth Science > Geo-Material-Science
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences > Material Science > Dispersive Solids
Date Deposited: 13 Jan 2014 12:34
DOI: 10.1111/jace.12067
Official URL: http://dx.doi.org/10.1111/jace.12067
Identification Number: doi:10.1111/jace.12067
Funders: This work was financially supported by the German Research Foundation (DFG) within the Priority Programme SPP1181 NANOMAT (IO 64/1 – 2).T IO 64/1–2
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