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@PHDTHESIS{Vorktter:874257,
      author       = {Vorkötter, Christoph},
      title        = {{A}luminiumoxiddispersionsverstärkte
                      {H}aftvermittlermaterialien in {W}ärmedämmschichtsystemen},
      volume       = {488},
      school       = {Univ. Bochum},
      type         = {Dissertation},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2020-01348},
      isbn         = {978-3-95806-457-7},
      series       = {Schriften des Forschungszentrums Jülich Reihe Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      pages        = {VIII, 99, XXXIII},
      year         = {2020},
      note         = {Dissertation, Univ. Bochum, 2020},
      abstract     = {Thermal barrier coatings typically consist of a ceramic top
                      coat on a metallic bondcoat. Used for gas turbine parts, for
                      example the turbine blade, these coatings can protect the
                      blade material from the high temperatures of the combustion
                      gasses, corrosionand oxidation. Besides enhanced top coat
                      bonding, the bond coat ensures oxidation protection of the
                      blade material by oxidising itself. In the present thesis
                      thermally sprayed alumina oxide dispersion strengthened
                      bondcoat materials were produced for the use in thermal
                      barrier coatings. High energy milled bond coat materials
                      were analysed with respect to the material properties and
                      the behaviour in thermal barrier coatings, which were
                      manufactured on single crystal superalloys with a common
                      yttria stabilized zirconia top coat. The bond coats low
                      porosity was achieved by low pressure plasma spraying. For
                      the high porosity of the top coat atmospheric plasma
                      spraying was used. The aging mechanisms of thermal barrier
                      coatings are influenced by several factors. Main factors are
                      stresses in the thermal barrier coating. These stresses
                      arise from the thermal expansion coefficient missmatch
                      between top coat, bond coat, blade material and the oxide
                      layer thermally growing on the bond coat. Previous studies
                      showed a high thermal cycling performance of thermal barrier
                      coatings with double layered bond coats consisting of 2
                      $wt.\%$ alumina oxide dispersion strengthened bond coats on
                      conventional bond coats compared to thermal barrier coatings
                      with single layered conventional bond coats. The approach of
                      this thesis is an increased alumina content up to 30 $wt.\%$
                      in the oxide dispersion strengthened bond coat. The result
                      is a lower thermal expansion coefficient of the upper bond
                      coat reducing the stresses in the thermal barrier coating,
                      which offers a possible increase in thermal barrier coating
                      thermal cycling performance. The approach was proved for
                      thermal barrier coatings using $10\%$ alumina in the oxide
                      dispersion strengthened bond coat. As a result of the lower
                      oxidation resistance of $30\%$ bond coat material, a further
                      increase to $30\%$ alumina does not further improve the
                      thermal cycling performance due to the lower thermal
                      expansion coefficient. Furthermore thermal barrier coatings
                      with columnar structured top coats combined with oxide
                      dispersion strengthened bond coats are promising candidates
                      for high thermal cycling performances. Wear resistant tests
                      showed an increased wear resistance especially for $30\%$
                      aluminia oxide dispersion strengthened bond coat materials.
                      The research of the present thesis was embedded in the
                      collaborative research center SFB/Transregio 103 “From
                      atoms to turbine blades“ focussing on the developmentof
                      superalloys. Correspondingly single crystal superalloys were
                      used for the thermal barrier coatings [...]},
      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/874257},
}