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Influence of SiC/Silica and Carbon/Silica Interfaces on the High-Temperature Creep of Silicon Oxycarbide-Based Glass Ceramics: A Case Study

Stabler, Christina and Schliephake, Daniel and Heilmaier, Martin and Rouxel, Tanguy and Kleebe, Hans-Joachim and Narisawa, Masaki and Riedel, Ralf and Ionescu, Emanuel (2019):
Influence of SiC/Silica and Carbon/Silica Interfaces on the High-Temperature Creep of Silicon Oxycarbide-Based Glass Ceramics: A Case Study.
In: Advanced Engineering Materials, Wiley-VCH, p. 1800596, 21, (6), ISSN 1438-1656,
DOI: 10.1002/adem.201800596,
[Online-Edition: https://onlinelibrary.wiley.com/doi/full/10.1002/adem.201800...],
[Article]

Abstract

In the present study, the high-temperature creep behavior of three SiOC glass ceramics with different phase compositions are compared by the authors. All three SiOC glass ceramics have a vitreous silica matrix in common, but comprise different homogeneously dispersed phases: 1) only spherical beta-SiC nanoparticles (sample denoted hereafter SiC/SiO2), 2) only high-aspect ratio sp(2)-hybridized carbon (i.e., C/SiO2), and 3) both phases (SiC and segregated carbon, i.e., C/SiC/SiO2). Compression creep experiments are performed at temperatures in the range between 1100 and 1300 degrees C and true stresses of 50 to 200 MPa. The determined activation energy for creep of the SiOC glass ceramics of around 700 kJ mol(-1) is independent of the phase composition. A stress exponent value of approximately 2 indicates an interface-controlled deformation mechanism. All SiOC glass ceramics exhibit significantly higher creep viscosities than that of vitreous silica. Surprisingly, the spherical beta-SiC nanoparticles have a higher impact on the effective creep viscosities of SiOC as compared to that of the high-aspect ratio segregated carbon phase. It is concluded that this originates from the beta-SiC/silica and C/silica interfaces, which have different effects on the creep behavior of silicon oxycarbide-based glass ceramics.

Item Type: Article
Erschienen: 2019
Creators: Stabler, Christina and Schliephake, Daniel and Heilmaier, Martin and Rouxel, Tanguy and Kleebe, Hans-Joachim and Narisawa, Masaki and Riedel, Ralf and Ionescu, Emanuel
Title: Influence of SiC/Silica and Carbon/Silica Interfaces on the High-Temperature Creep of Silicon Oxycarbide-Based Glass Ceramics: A Case Study
Language: English
Abstract:

In the present study, the high-temperature creep behavior of three SiOC glass ceramics with different phase compositions are compared by the authors. All three SiOC glass ceramics have a vitreous silica matrix in common, but comprise different homogeneously dispersed phases: 1) only spherical beta-SiC nanoparticles (sample denoted hereafter SiC/SiO2), 2) only high-aspect ratio sp(2)-hybridized carbon (i.e., C/SiO2), and 3) both phases (SiC and segregated carbon, i.e., C/SiC/SiO2). Compression creep experiments are performed at temperatures in the range between 1100 and 1300 degrees C and true stresses of 50 to 200 MPa. The determined activation energy for creep of the SiOC glass ceramics of around 700 kJ mol(-1) is independent of the phase composition. A stress exponent value of approximately 2 indicates an interface-controlled deformation mechanism. All SiOC glass ceramics exhibit significantly higher creep viscosities than that of vitreous silica. Surprisingly, the spherical beta-SiC nanoparticles have a higher impact on the effective creep viscosities of SiOC as compared to that of the high-aspect ratio segregated carbon phase. It is concluded that this originates from the beta-SiC/silica and C/silica interfaces, which have different effects on the creep behavior of silicon oxycarbide-based glass ceramics.

Journal or Publication Title: Advanced Engineering Materials
Volume: 21
Number: 6
Publisher: Wiley-VCH
Uncontrolled Keywords: glass ceramics; high-temperature creep; interface-controlled creep; interfaces; silicon oxycarbide POLYMER-DERIVED CERAMICS; MECHANICAL CHARACTERIZATION; STRUCTURAL-CHARACTERIZATION; FAILURE MECHANISMS; STRESS-RELAXATION; METALLIC-GLASS; SIOC GLASS; BEHAVIOR; VISCOSITY; CARBON
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: 10 Jul 2019 05:23
DOI: 10.1002/adem.201800596
Official URL: https://onlinelibrary.wiley.com/doi/full/10.1002/adem.201800...
Projects: Deutsche Forschungsgemeinschaft: IO 64/7-1, HE 1872/30-1
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