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@ARTICLE{Ionescu:186614,
author = {Ionescu, Emanuel and Balan, Corneliu and Kleebe,
Hans-Joachim and Müller, Mathis M. and Guillon, Olivier and
Schliephake, Daniel and Heilmaier, Martin and Riedel, Ralf
and Sglavo, V.},
title = {{H}igh-{T}emperature {C}reep {B}ehavior of {S}i{OC} {G}lass
{C}eramics: {I}nfluence of {N}etwork {C}arbon {V}ersus
{S}egregated {C}arbon},
journal = {Journal of the American Ceramic Society},
volume = {97},
number = {12},
issn = {0002-7820},
address = {Oxford [u.a.]},
publisher = {Wiley-Blackwell},
reportid = {FZJ-2015-00687},
pages = {3935 - 3942},
year = {2014},
abstract = {Three silicon oxycarbide samples with different carbon
contents are analyzed in the present study with respect to
their high-temperature creep behavior. The tests were
performed in compression at 1100°C, 1200°C, and 1300°C;
in this temperature range the mechanism of creep relies on
viscoelastic flow within the samples and has been modeled
with the Jeffreys viscoelastic model. After the release of
the applied mechanical stress, a viscoelastic recovery
behavior was observed in all samples. The creep behavior of
the investigated samples indicates two rheological
contributions in SiOC: (i) a high viscous answer, coming
from the silica-rich network, and (ii) an elastic response
from the segregated carbon phase within the samples.
Furthermore, two distinct effects of the carbon phase on the
HT creep behavior of SiOC were identified and are discussed
in the present paper: the effect of the carbon presence
within the SiOC network (the “carbidic” carbon), which
induces a significant increase in the viscosity and a strong
decrease in the activation energy for creep, as compared to
vitreous silica; and the influence of the segregated carbon
phase (the “free” carbon), which has been shown to
affect the viscosity and the activation energy of creep and
dominates the creep behavior in phase-separated silicon
oxycarbides.},
cin = {IEK-1},
ddc = {660},
cid = {I:(DE-Juel1)IEK-1-20101013},
pnm = {899 - ohne Topic (POF2-899)},
pid = {G:(DE-HGF)POF2-899},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000346099800034},
doi = {10.1111/jace.13206},
url = {https://juser.fz-juelich.de/record/186614},
}