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@PHDTHESIS{Heckmann:32189,
      author       = {Heckmann, S.},
      title        = {{E}rmittlung des {V}erformungs- und
                      {S}chädigungsverhaltens von {W}ärmedämmschichtsystemen},
      volume       = {4077},
      issn         = {0944-2952},
      school       = {Techn. Hochsch. Aachen},
      type         = {Dr. (FH)},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-32189, Juel-4077},
      series       = {Berichte des Forschungszentrums Jülich},
      pages        = {163 p.},
      year         = {2003},
      note         = {Record converted from VDB: 12.11.2012; Aachen, Techn.
                      Hochsch., Diss., 2003},
      abstract     = {The application of gas turbines for the generation of
                      electricity bas significantly increased over the past
                      decades. In order to reduce emissions and to conserve fossil
                      fuels, the thermal efficiency of stationary gas turbines
                      should be increased. This can be achieved mainly by higher
                      turbine inlet temperatures and by reduction of the cooling
                      air flow. The use of thermal barrier coatings (TBCs) has
                      great potential for increasing the thermal efficiency, while
                      at the same time limiting metal temperatures of the blades.
                      The exploitation of the potential of TBCs has, however, been
                      hampered by the lack of systematic data concerning the
                      damage development, and of the material properties that
                      affect it. In the present work, the damage development in a
                      TBC system has been investigated under simulated service
                      conditions. The system consisted of an atmospheric plasma
                      sprayed, yttrium stabilized zirconium oxide; a bond coat
                      (BC) layer of NiCoCrAlY (balance Ni, $21.1\%Co,$ $17.1\%Cr,$
                      $12.6\%Al,$ $0.61\%Y,$ $0.4\%Hf)$ that also acts as a
                      corrosion protection; and a substrate of the polycrystalline
                      turbine blade alloy IN 792 CC or the single crystalline
                      CMSX-4. For the isothermal low cycle fatigue (LCF) testing,
                      additional means for the heating of coated specimens were
                      developed and for the thermomechanical fatigue (TMF) tests,
                      completely new test techniques were necessary. The
                      manufacture of specimens of the isolated coating and
                      compression testing of these specimen were successfully
                      carried out. The results obtained show that there are
                      significant differences in the damage development in TMF
                      loading and in isothermal (LCF) loading. In TMF loading with
                      maximum and minimum temperatures of 950 and 450°C, shorter
                      fatigue lives than those in the LCF tests were measured.
                      Investigations of the damage in the TBC using acoustic
                      emission and calculation of the stress in the TBC have
                      contributed to the understanding of the damage processes. To
                      obtain data for the analysis of the mechanical behaviour,
                      the time-dependent deformation behaviours of both TBC and BC
                      and the elastic modulus of the TBC were determined. Based on
                      these data, a deformation model was derived, which
                      interpreted the deformation under compressive stress as a
                      change in the defect structure of the TBC.},
      cin          = {IWV-2},
      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/32189},
}