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@ARTICLE{Mahade:838245,
      author       = {Mahade, Satyapal and Curry, Nicholas and Björklund, Stefan
                      and Markocsan, Nicolaie and Nylén, Per and Vaßen, Robert},
      title        = {{F}unctional performance of {G}d 2 {Z}r 2 {O} 7 /{YSZ}
                      multi-layered thermal barrier coatings deposited by
                      suspension plasma spray},
      journal      = {Surface and coatings technology},
      volume       = {318},
      issn         = {0257-8972},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2017-06900},
      pages        = {208 - 216},
      year         = {2017},
      abstract     = {7–8 $wt.\%$ yttria stabilized zirconia (YSZ) is the
                      standard ceramic top coat material used in gas turbines to
                      insulate the underlying metallic substrate. However, at
                      higher temperatures (> 1200 °C), phase stability and
                      sintering becomes an issue for YSZ. At these temperatures,
                      YSZ is also susceptible to CMAS (calcium magnesium alumino
                      silicates) infiltration. New ceramic materials such as
                      pyrochlores have thus been proposed due to their excellent
                      properties such as lower thermal conductivity and better
                      CMAS attack resistance compared to YSZ. However, pyrochlores
                      have inferior thermo mechanical properties compared to YSZ.
                      Therefore, double-layered TBCs with YSZ as the intermediate
                      layer and pyrochlore as the top ceramic layer have been
                      proposed. In this study, double layer TBC comprising
                      gadolinium zirconate (GZ)/YSZ and triple layer TBC
                      (GZdense/GZ/YSZ) comprising relatively denser GZ top layer
                      on GZ/YSZ were deposited by suspension plasma spray. Also,
                      single layer 8YSZ TBC was suspension plasma sprayed to
                      compare its functional performance with the multi-layered
                      TBCs. Cross sections and top surface morphology of as
                      sprayed TBCs were analyzed by scanning electron microscopy
                      (SEM). XRD analysis was done to identify phases formed in
                      the top surface of as sprayed TBCs. Porosity measurements
                      were made using water intrusion and image analysis methods.
                      Thermal diffusivity of the as sprayed TBCs was measured
                      using laser flash analysis and thermal conductivity of the
                      TBCs was calculated. The multi-layered GZ/YSZ TBCs were
                      shown to have lower thermal conductivity than the single
                      layer YSZ. The as sprayed TBCs were also subjected to
                      thermal cyclic testing at 1300 °C. The double and triple
                      layer TBCs had a longer thermal cyclic life compared to YSZ.
                      The thermo cycled samples were analyzed by SEM.},
      cin          = {IEK-1},
      ddc          = {620},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {113 - Methods and Concepts for Material Development
                      (POF3-113)},
      pid          = {G:(DE-HGF)POF3-113},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000402356100024},
      doi          = {10.1016/j.surfcoat.2016.12.062},
      url          = {https://juser.fz-juelich.de/record/838245},
}