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@PHDTHESIS{Terberger:283042,
      author       = {Terberger, Philipp J.},
      title        = {{A}lterung von {V}akuum-plasmagespritzten
                      {MC}r{A}l{Y}-{S}chutzschichten und ihre {W}echselwirkung mit
                      {N}ickel- und {C}obalt-basierten
                      $\gamma$/$\gamma$’-{S}uperlegierungen},
      volume       = {301},
      school       = {Universität Bochum},
      type         = {Dr.},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2016-01724},
      isbn         = {978-3-95806-113-2},
      series       = {Schriften des Forschungszentrums Jülich Reihe Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      pages        = {IX, 149 S.},
      year         = {2015},
      note         = {Universität Bochum, Diss., 2015},
      abstract     = {$\gamma$/$\gamma$’ single crystal superalloys with
                      plasma-sprayed thermal barrier coating systems are used as
                      turbine rotor blades in gas turbines if the blades are
                      exposed to high temperatures and high mechanical loads. A
                      bond coat (BC) is part of the thermal barrier coating
                      system. It protects the substrate from oxidation and ensures
                      good bonding of the ceramic coating that serves as a thermal
                      insulator. MCrAlY (M=Ni,Co) alloys are commonly used as BCs.
                      They form a protective Al$_{2}$O$_{3}$ layer. This study
                      invesitgates four different vacuum plasma-sprayed MCrAlY BCs
                      with and without Re after thermal treatment of up to 1000 h
                      at 1044°C in air. The employed substrates are the Ni-based
                      superalloy ERBO1 and the novel Co-based $\gamma$/$\gamma$’
                      superalloy ERBOCo-1. Additionally, the ternary
                      $\gamma$/$\gamma$’ alloy Co-9Al-9W (in at.\%) was aged
                      with a BC for up to 500 h at 900°C. Up to now little is
                      known about the interaction of the Co-based substrates and
                      the BCs. Oxidation and Al depletion of the BC as well as the
                      interdiffusion of BCs and substrates are analysed primarily
                      on the basis of SEM/EDXand XRD. The effect of Y and Hf on
                      the microstructure of the oxide scale is discussed. Rate
                      constants show that Hf results in higher oxidation rates
                      while Re slows down the oxidation. The influence of the
                      alloying elements on the BC microstructure is described. For
                      exam-ple, Co prevents the formation of $\gamma$' phase, Re
                      slows down diffusion and results in theformation of brittle
                      phases. The choice of substrate material has no measurable
                      influence on the oxidation. Qualitative and quantitative
                      analysis of the interdiffusion zone (IDZ) shows that the
                      choi-ce of substrate surface pre-treatment (grit blasting or
                      grinding) has a major influence on the interdiffusion
                      behaviour with the BC. Grinding results in a thinner IDZ and
                      fewer topologically closed packed (TCP) phases. The reason
                      for this is the recrystallisation of the single crystal
                      substrate. A study of the influence of the substrate crystal
                      orientationon the interdiffusion shows no correlation.
                      However, microstructure and thickness of the IDZ are
                      influenced by the choice of BC. Co-9Al-9W shows a better
                      compatibility with a CoNiCrAlY BC compared to a NiCo-CrAlY
                      BC. This is attributed to the Cr activity. $\mu$ phase and
                      $\sigma$ phase form in the IDZ. The reaction of Y and Hf
                      with Al$_{2}$O$_{3}$ grit on the substrate surface is
                      analysed. ERBOCo-1 shows particularly good results with
                      MCrAlY BCs. No or few TCP phases form. Parabolic rate
                      constants of the IDZ growth are similiar to those for ERBO1.
                      Diffusion of substrate elements to the outer part of the BCs
                      was found.},
      cin          = {IEK-1},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {899 - ohne Topic (POF3-899) / HITEC - Helmholtz
                      Interdisciplinary Doctoral Training in Energy and Climate
                      Research (HITEC) (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF3-899 / G:(DE-Juel1)HITEC-20170406},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/283042},
}