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@PHDTHESIS{Go:903943,
      author       = {Go, Teresa},
      title        = {{S}ynthese von {C}r$_{2}${A}l{C} {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     = {FZJ-2021-05551},
      isbn         = {978-3-95806-598-7},
      series       = {Schriften des Forschungszentrums Jülich. Reihe Energie
                      $\&$ Umwelt / Energy $\&$ Environment},
      pages        = {ii, 119 S.},
      year         = {2021},
      note         = {RWTH Aachen, Diss., 2021},
      abstract     = {Three different ceramic matrix composites (CMCs) were
                      produced using Cr$_{2}$AlC as a matrix, and carbon, SiC, and
                      Al$_{2}$O$_{3}$ short fibers as a secondary phase.
                      Cr$_{2}$AlC powders were synthesized 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 Cr$_{2}$AlC,
                      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 Cr$_{2}$AlC 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.\% Al$_{2}$O$_{3}$ fibers.
                      In long-term oxidation tests at 1200 °C for 4 weeks, a
                      strong reaction 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 oxidation, 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 compressive streng that room
                      temperature and 900 °C. This reinforcement is clearly
                      evident here. CMCs with Al$_{2}$O$_{3}$-fibers with stand
                      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          = {IEK-1},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {899 - ohne Topic (POF4-899)},
      pid          = {G:(DE-HGF)POF4-899},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      url          = {https://juser.fz-juelich.de/record/903943},
}