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@PHDTHESIS{Go:840341,
author = {Go, Teresa},
othercontributors = {Gonzalez-Julian, Jesus and Schneider, Jochen M.},
title = {{S}ynthese von {C}r$_{2}${AIC} {MAX}-{P}hasen {K}ompositen
und {B}estimmung ihrer oxidativen {E}igenschaften},
volume = {558},
school = {RWTH Aachen University},
type = {Dissertation},
address = {Jülich},
publisher = {Forschungszentrum Jülich GmbH, Zentralbibliothek, Verlag},
reportid = {RWTH-2022-01202},
isbn = {978-3-95805-598-7},
series = {Schriften des Forschungszentrums Jülich. Reihe Energie
$\&$ Umwelt = energy $\&$ environment},
pages = {ii, 119 Seiten : Illustrationen, Diagramme},
year = {2021},
note = {Druckausgabe: 2021. - Onlineausgabe: 2021. - Auch
veröffentlicht auf dem Publikationsserver der RWTH Aachen
University 2022; Dissertation, RWTH Aachen University, 2021},
abstract = {Three different ceramic matrix composites (CMCs) were
produced using Cr2AlC as a matrix, and carbon, SiC, and
Al2O3 short fibers as a secondary phase. Cr2AlC powders were
synthe-sized by solid-state reaction, followed by mixing
with the fibers, and full densification using a
field-assisted sintering technique (FAST/SPS). Carbon fibers
react strongly with Cr2AlC, meaning that these composites
are not suitable for use, while the reaction of SiC fibers
is less strong. The composites containing alumina fibers do
not exhibit any reaction. Oxidation tests of the monolithic
Cr2AlC and the composites were performed by
thermogravimetric analysis. Of all the chosen CMCs, 10
$wt.\%$ SiC fibers resulted in the lowest mass gain. The
parabolic and cubic rates of oxidation were determined to
find the best fitting calculation. The overall oxidation
response is parabolic. The alumina layer formed at 1000 °C
is well attached and the oxidation response is good.
However, at 1200 °C, this layer detached for monolithic
material and 10 $wt.\%$ Al2O3 fibers. In long-term oxidation
tests at 1200 °C for 4 weeks, a strong reac-tion of the
CMCs in contrast to the monolithic material is observed. The
oxidation response of the alumina fiber CMC is good under
realistic conditions using a burner rig for cyclic
oxida-tion, as defects or degradation are barely visible,
and the alumina layer is well attached. The mechanical
reinforcement effect of the fibers was implemented by
measuring the compres-sive strength at room temperature and
900 °C. This reinforcement is clearly evident here. CMCs
with Al2O3-fibers withstand higher compressive stresses than
monolithic material. The highest compressive stresses are
measured in CMCs with SiC fibers, whereby the reason for
this increase can also lie in the secondary phases that
arise during sintering.},
cin = {524110 / 520000},
ddc = {620},
cid = {$I:(DE-82)524110_20140620$ / $I:(DE-82)520000_20140620$},
typ = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
doi = {10.18154/RWTH-2022-01202},
url = {https://publications.rwth-aachen.de/record/840341},
}
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