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@BOOK{Subanovic:136189,
      author       = {Subanovic, Marko},
      title        = {{E}influss der {B}ondcoatzusammensetzung und
                      {H}erstellungsparameter auf die {L}ebensdauer von
                      {W}ärmedämmschichten bei zyklischer {T}emperaturbelastung},
      volume       = {42},
      school       = {RWTH Aachen},
      type         = {Dr.},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {PreJuSER-136189},
      isbn         = {978-3-89336-582-1},
      series       = {Schriften des Forschungszentrums Jülich. Reihe Energie und
                      Umwelt / Energy und Environment},
      pages        = {188, VI S.},
      year         = {2009},
      note         = {Record converted from JUWEL: 18.07.2013; RWTH Aachen,
                      Diss., 2008},
      abstract     = {In the present study the influence of the bond coat
                      composition on the lifetime of thermal barrier coatings
                      during thermal cycling was investigated. The knowledge, that
                      the reactive elements (RE), which are essential for the
                      improvement of the oxide scale adhesion, are “lost”,
                      during the bond coat processing, made it necessary to
                      investigate systematically the influence of the different
                      manufacturing stages on the RE distribution. After VPS
                      (vacuum plasma spraying) with a high oxygen partial pressure
                      in the spraying chamber, the reactive elements in the
                      NiCoCrAl-coating were tied up in oxide precipitates, and
                      thus their beneficial effect on the scale adhesion was
                      inhibited. Another important observation is that the RE’s
                      are depleted during the bondcoat vacuum heat-treatment. The
                      degree of Y-depletion depends not only on the Y-reservoir in
                      the coating (Y-content and thickness) but also on the
                      heat-treatment parameters, such as vacuum quality and
                      temperature. A thin, dense alumina oxide scale with a smooth
                      interface between bond coat and TGO doesn’t necessary lead
                      to a lifetime extension of the EB-PVD TBC’s. TBC’s with
                      such oxide morphology typically failed due to crack
                      formation and propagation along the interface between the
                      TGO and the bondcoat. By addition of zirconium it was
                      possible to shift the failure initiation from the interface
                      TGO/bondcoat to the interface TBC/TGO, which can apparently
                      accommodate more thermal strain energy before failure. The
                      shift of the failure location was achieved by a change of
                      the oxide morphology, which mainly relies on adjusting a
                      non-even wavy interface between the TGO and the bond coat
                      and formation of defected oxide layers. In contrast, a
                      defected oxide scale with a high growth rate shortened the
                      life time of APSTBC’s. Porosity and spinel formation
                      weakened the mechanical integrity of the oxide scale, and
                      facilitated the crack formation and propagation of the
                      already existing cracks. The potential to improve lifetimes
                      of APS-TBC’s should arise from an adjustment of optimal
                      interface roughness between TBC and bond coat, a TBC
                      morphology with defect perpendicular to the crack
                      propagation direction, formation of oxide scales with a low
                      defect density and growth rate, “strong” interface
                      between bond coat and oxide. [...]},
      keywords     = {Boncoat / Wärmedämmschichten / metallische
                      Haftvermittlerschichten},
      cin          = {IEF-2},
      ddc          = {500},
      cid          = {I:(DE-Juel1)VDB810},
      pnm          = {Rationelle Energieumwandlung},
      pid          = {G:(DE-Juel1)FUEK402},
      shelfmark    = {THS - Turbines, pumps / FMTG - High temperature alloys /
                      THS - Turbinen, Pumpen / FZJ - Schriftenreihen des
                      Forschungszentrums Jülich},
      typ          = {PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/136189},
}