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@PHDTHESIS{Majerus:42143,
      author       = {Majerus, Patrick},
      title        = {{N}eue {V}erfahren zur {A}nalyse des {V}erformungs- und
                      {S}chädigungsverhaltens von {MC}r{A}l{Y}-{S}chichten im
                      {W}ärmedämmschichtsystem},
      volume       = {34},
      school       = {RWTH Aachen},
      type         = {Dr. (FH)},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-42143},
      isbn         = {3-89336-372-6},
      series       = {Schriften des Forschungszentrums Jülich. Reihe
                      Energietechnik/Energy Technology},
      pages        = {157 Seiten},
      year         = {2004},
      note         = {Record converted from VDB: 12.11.2012; RWTH Aachen, Diss.,
                      2003},
      abstract     = {Thermal barrier coatings applied to thermally highly loaded
                      areas of land-based gas turbines represent a promising tool
                      to increase efficiency and to reduce emissions in the
                      conventional electric power production. A basic requirement
                      to achieve reliable use of thermal barrier coatings is an
                      improved understanding of deformation and damage within the
                      coating system and of the respective influencing factors.
                      The present work is concerned with the application of new
                      experimental procedures to a thermal barrier coating system,
                      composed of an APS- or EB-PVD-TBC (partially stabilised
                      Zirconia) and a VPS bond coat $(48,3\%$ Ni, $21,1\%$ Co,
                      $17,1\%$ Cr, $12,6\%$ Al, $0,61\%$ Y, $0,4\%$ Hf) on the
                      single crystal alloy CMSX-4. The creep properties within the
                      coating system of the MCrAlY bond coat have been
                      investigated using a double shear creep testing assembly,
                      especially developed for thermal barrier coatings.
                      Parameters to describe primary and secondary creep for the
                      temperature range 750°C - 1050°C were acquired on
                      specimens before and after annealing at 1050°C. The
                      influence of temperature and creep deformation on the
                      microstructure was additionally evaluated. Based on these
                      results, a set of data describing the deformation behaviour
                      of the MCrAlY coating was established to be used in finite
                      element models. Accompanying three and four point bending
                      tests, a combination of two non-destructive diagnostic
                      procedures, acoustic emission analysis and optical in-situ
                      observations by CCD camera, was used to study mechanically
                      induced damage evolution of the coating system. Time and
                      location of crack initiation, as well as crack propagation
                      path up to macroscopic failure could be assigned for tensile
                      and compression loading at both, room temperature and
                      950°C. In addition some of the specimens have been annealed
                      over 300 hours at 1050°C prior to testing. Critical strain
                      values were determined in correlation to the damage
                      evolution. A TMF testing device was build up, designed to
                      simulate the service loading of turbine blades in the lab as
                      a superposition of cyclic thermal and cyclic mechanical
                      loads. The progressive method of Pulse Thermography has been
                      used to detect hidden delamination cracks within the TBC. To
                      design the experimental simulation, a dwell time at high
                      temperature was integrated into the thermomechanical cycle,
                      which led to an activation of oxidation processes at the
                      interface. This was shown to be a necessary requirement in
                      order to simulate the failure type of the TBC system, known
                      from gas turbines.},
      cin          = {IWV-2},
      ddc          = {620},
      cid          = {I:(DE-Juel1)VDB2},
      pnm          = {Werkstoffsysteme für Kraftwerke},
      pid          = {G:(DE-Juel1)FUEK248},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/42143},
}