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@PHDTHESIS{Wolf:890451,
      author       = {Wolf, Markus},
      title        = {{E}ntwicklung von {S}chutzschichten für nicht-oxidische
                      {F}aserverbundwerkstoffe},
      volume       = {528},
      school       = {Universität Bochum},
      type         = {Dr.},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2021-00967},
      isbn         = {978-3-95806-524-6},
      series       = {Schriften des Forschungszentrums Jülich. Reihe Energie
                      $\&$ Umwelt / Energy $\&$ Environment},
      pages        = {VI, 150, 2 S.},
      year         = {2021},
      note         = {Universität Bochum, Diss., 2020},
      abstract     = {The non-oxide ceramic matrix composites (CMCs), which
                      exhibit good mechanical high-temperature properties and low
                      density, represent a promising alternative to the
                      temperature-limited metallic materials. However, a problem
                      with these CMCs is their high susceptibility to corrosion in
                      an atmosphere containing water vapor at temperatures above
                      1200°C. In order to protect the material from the influence
                      of corrosive media, various protective coating systems
                      (environmental barrier coatings, EBCs) are applied to the
                      CMC. The aim of the work described here is to develop a
                      coating system that protects the base material from
                      corrosive atmospheres in cooperation with an industrial
                      partner. The focus of the present work is on the manufacture
                      and optimization of EBCs for the protection of silicon
                      carbide-based CMCs. In a first step, different material
                      candidates have been investigated for their thermal,
                      thermomechanical, and mechanical properties to evaluate an
                      optimal EBC candidate. In particular, the corrosion
                      resistance against calcium-magnesium-aluminum-silicates
                      (CMAS) has been considered. Subsequently, the best evaluated
                      materials Yb$_{2}$Si$_{2}$O$_{7}$ and a mixture of
                      Yb$_{2}$Si$_{2}$O$_{7}$ and Yb$_{2}$SiO$_{5}$ were applied
                      to the CMC using different thermal spray processes. These
                      two materials show a high corrosion protection against CMAS
                      and coefficients of thermal expansion adapted to the CMC.
                      Below the top layers of these two materials, the CMC is
                      additionally coated with a silicon bond coat to create a
                      complete EBC layer system. By varying the process
                      parameters, it was possible to design the top layers in such
                      a way that they were very dense, crackfree and crystalline
                      at the same time. The layers developed with the different
                      processes were subjected to evaluate the thermal shock
                      resistance during thermal cycling and compared to each
                      other. In addition to the material study and the
                      optimization of layer deposition, the surface of the bond
                      coat was structured with a laser to increase the adhesion of
                      the top layer to the bond coat. In this way, the lifetime of
                      the coatings was further increased. The effect of this
                      structuring has been verified by means of an adapted test of
                      interfacial toughness. It turned out that the interfacial
                      toughness could be increased by 70\% by means of the added
                      structure. However, it was also found that the test
                      methodology needs to be optimized, since the observed crack
                      did not continuously follow the interface to be tested. In a
                      final test series, the deposition of a
                      Silicon-Yb$_{2}$Si$_{2}$O$_{7}$ layer system was transferred
                      from flat substrates to a 3D substrate in the form of a
                      turbine blade edge.},
      cin          = {IEK-1},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {124 - Hochtemperaturtechnologien (POF4-124)},
      pid          = {G:(DE-HGF)POF4-124},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      url          = {https://juser.fz-juelich.de/record/890451},
}