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@ARTICLE{Bakan:154057,
      author       = {Bakan, Emine and Mack, Daniel Emil and Mauer, Georg and
                      Vassen, Robert},
      title        = {{G}adolinium {Z}irconate/{YSZ} {T}hermal {B}arrier
                      {C}oatings: {P}lasma {S}praying, {M}icrostructure and
                      {T}hermal {C}ycling {B}ehavior},
      journal      = {Journal of the American Ceramic Society},
      volume       = {97},
      number       = {12},
      issn         = {0002-7820},
      address      = {Oxford [u.a.]},
      publisher    = {Wiley-Blackwell},
      reportid     = {FZJ-2014-03462},
      pages        = {4045-4051},
      year         = {2014},
      abstract     = {Processing of Gd2Zr2O7 by atmospheric plasma spraying (APS)
                      is challenging due to the difference in vapor pressure
                      between gadolinia and zirconia. Gadolinia is volatilized to
                      a greater extent than zirconia and the coating composition
                      unfavorably deviates from the initial stoichiometry. Aiming
                      at stoichiometric coatings, APS experiments were performed
                      with a TriplexPro™ plasma torch at different current
                      levels. Particle diagnostics proved to be an effective tool
                      for the detection of potential degrees of evaporation via
                      particle temperature measurements at these varied current
                      levels. Optimized spray parameters for Gd2Zr2O7 in terms of
                      porosity and stoichiometry were used to produce double-layer
                      TBCs with an underlying yttria-stabilized zirconia (7YSZ)
                      layer. For comparison, double layers were also deposited
                      with relatively high torch currents during Gd2Zr2O7
                      deposition, which led to a considerable amount of
                      evaporation and relatively low porosities. These coatings
                      were tested in thermal cycling rigs at 1400°C surface
                      temperature. Double layers manufactured with optimized
                      Gd2Zr2O7 spray parameters revealed very good thermal cycling
                      performance in comparison to standard 7YSZ coatings, whereas
                      the others showed early failures. Furthermore, different
                      failure modes were observed; coatings with long lifetime
                      failed due to TGO growth, while the coatings displaying
                      early failures spalled through crack propagation in the
                      upper part of the 7YSZ layer.},
      cin          = {IEK-1},
      ddc          = {660},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {122 - Power Plants (POF2-122) / HITEC - Helmholtz
                      Interdisciplinary Doctoral Training in Energy and Climate
                      Research (HITEC) (HITEC-20170406)},
      pid          = {G:(DE-HGF)POF2-122 / G:(DE-Juel1)HITEC-20170406},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000346099800049},
      doi          = {10.1111/jace.13204},
      url          = {https://juser.fz-juelich.de/record/154057},
}