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@PHDTHESIS{Blandin:58846,
      author       = {Blandin, Gwendolin and Steinbrech, Rolf Willi},
      title        = {{T}hermomechanisches {V}erhalten von plasmagespritzten
                      {S}chichtsystemen zur {W}ärmedämmung},
      volume       = {3954},
      issn         = {0944-2952},
      school       = {Techn. Hochsch. Aachen},
      type         = {Dr. (FH)},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-58846, Juel-3954},
      series       = {Berichte des Forschungszentrums Jülich},
      pages        = {IV, 121 p.},
      year         = {2002},
      note         = {Record converted from VDB: 12.11.2012; Aachen, Techn.
                      Hochsch., Diss., 2002},
      abstract     = {Thermal barrier coatings are increasingly utilized to
                      protect gas turbine components from high temperature
                      exposure. Thus the use of TBCs allows an improvement of the
                      system efficiency, since the coated components can support
                      higher inlet temperatures. For stationary gas turbine
                      applications, the combination of an oxidation resistant
                      MCrAlY bond coat and a 7-8 WL $\%$ Y$_{2}$O$_{3}$-ZrO$_{2}$
                      plasma sprayed top coat is currently the favored TBC-system.
                      To predict the life duration of the TBC-system, the
                      determination of the high temperature behavior of the
                      protective coatings in composite geometry is indispensable.
                      Also the residual stresses, which result from spraying
                      process and thermal expansion misfit between the bonded
                      layers, are of crucial importance. In the present study,
                      experiments were selected to evaluate the thermoelastic
                      properties of a plasma sprayed TBC in composite geometry.
                      The curvature behavior of three-layer specimen strips was
                      observed between room temperature and 1000°C, when
                      submitted exclusively to temperature. Also isothermal
                      4-point bending tests were performed at room temperature,
                      600°C and 950°C. During curvature and bending experiments,
                      shape and structure changes were monitored in-situ using a
                      high resolution telescope in combination with a digital data
                      acquisition system. In parallel, a linear-elastic model was
                      developed to calculate analytically the stress distribution
                      in multi-layered systems. The high temperature experiments
                      on the TBC-specimen strips demonstrate that the bonded
                      materials behave elastically up to 600°C. Depending on the
                      specimens geometry, i.e. on the stress distribution,
                      non-elastic effects can occur above 600°C (crack formation
                      in the ceramic coating or stress relaxation and phase
                      changes in the bond coat). When all layers show an elastic
                      behavior, the stress distribution can be calculated at room
                      and at high temperatures. Using the proposed linear-elastic
                      model, the temperature dependent elastic modulus of the
                      ceramic TBC in composite geometry can also be derived. The
                      obtained values are about 20 \% behind the modulus offree
                      standing layers.},
      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/58846},
}