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@PHDTHESIS{Gatzen:865446,
      author       = {Gatzen, Caren Sophia},
      title        = {{E}ntwicklung von korrosionsstabilen {S}chutzschichten für
                      oxidische {F}aserverbundwerkstoffe},
      volume       = {471},
      school       = {Univ. Bochum},
      type         = {Dissertation},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2019-04897},
      isbn         = {978-3-95806-422-5},
      series       = {Schriften des Forschungszentrums Jülich Reihe Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      pages        = {II, 143},
      year         = {2019},
      note         = {Dissertation, Univ. Bochum, 2019},
      abstract     = {Due to their high specific strength and high temperature
                      resistance, oxide ceramic matrix composites (CMCs) are
                      promising materials for high-temperature applications, e.g.
                      in gas turbine combustion chambers. However, degradation due
                      to water vapor corrosion at temperatures above 1200 °C is a
                      serious problem. Environmental barrier coatings (EBCs) are
                      required to prevent or minimize these reactions. The focus
                      of this work is the development of EBCs for an alumina-based
                      CMC, especiallythe improvement of the adhesion between
                      coating and CMC. First, different methods of surface
                      structuring of the CMC were investigated. The structuring by
                      laser ablation turned out to be promising and was
                      investigated in detail. Subsequently, YSZ,
                      Gd$_{2}$Zr$_{2}$O$_{7}$, Y$_{2}$O$_{3}$ and YAlO$_{3}$ were
                      selected as potential protective coatings due to their low
                      recession rates and fitting thermal expansion coefficients.
                      Samples of the CMC, with and without laser structuring were
                      coated by plasma spraying. The suitability of these coating
                      systems and their adhesion to the substrate were
                      investigated by tensile adhesion tests and thermal cycling.
                      Two different adhesion mechanisms were found: YSZ- and
                      Gd$_{2}$Zr$_{2}$O$_{7}$- coatings adhere mainly by
                      mechanically interlocking to the substrate.Structuring of
                      the samples before coating could considerably improve the
                      adhesion. Y$_{2}$O$_{3}$- and YAlO$_{3}$- coatings react
                      with the Al$_{2}$O$_{3}$-based substrate to form yttrium
                      alluminates. Due to the formation of this boundary layer, a
                      very good adhesion was achieved, even on unstructured
                      samples. Since the corrosion stability is also important for
                      an EBC, selected samples were used to validate a new
                      corrosion test procedure in which significant corrosion
                      rates can be measured within a short time by using a HVOF
                      torch.},
      cin          = {IEK-1},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {113 - Methods and Concepts for Material Development
                      (POF3-113)},
      pid          = {G:(DE-HGF)POF3-113},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      url          = {https://juser.fz-juelich.de/record/865446},
}