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@PHDTHESIS{Joeris:1032300,
      author       = {Joeris, Jana},
      title        = {{A}bscheidung kolumnarer {W}ärmedämmschichten mittels
                      {S}uspensionsplasmaspritzen ({SPS}) und {P}lasma {S}pray –
                      {P}hysical {V}apor {D}eposition ({PS}-{PVD}) {P}rozesse},
      volume       = {628},
      school       = {Bochum University},
      type         = {Dissertation},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2024-06139},
      isbn         = {978-3-95806-752-3},
      series       = {Reihe Energie $\&$ Umwelt / Energy $\&$ Environment},
      pages        = {vii, 133},
      year         = {2024},
      note         = {Dissertation, Bochum University, 2023},
      abstract     = {In this work, columnar thermal barrier coatings are
                      prepared by suspension plasma spraying (SPS) and plasma
                      spray-physical vapor deposition (PS-PVD) process. For
                      industrial applications, increasing the lifetime of the
                      coatings is an important aim. For this purpose, the thermal
                      expansion coefficient of metal and ceramic is equalized by
                      introducing an oxide dispersion strengthened (ODS) layer,
                      which can reduce the radial stresses in the thermal barrier
                      coating. Furthermore, the service life is extended by
                      pre-oxidation of the bond coat with formation of an aluminum
                      oxide layer. At the beginning of the work, the material and
                      process parameters for the coating processes are evaluated.
                      The objective is to produce columnar microstructures that
                      have a high column density. In the SPS process, the
                      microstructure is significantly affected by the feed rate of
                      the suspension. Too high feeding rates increases the
                      porosity of the coating strongly and significantly reduce
                      the deposition efficiency. Columnar structures are then
                      difficult to produce. To deposit columnar structures, the
                      atomization of the suspension and the melting of the
                      agglomerated particles must be optimized. This is achieved
                      by optimizing the plasma gas composition and quantity. For
                      the SPS process, a high column density is achieved when
                      as.sprayed bondcoats with a high number of roughness peaks
                      are used, whereas polished surfaces are required for the
                      PS-PVD process. The evaluated parameters are then used to
                      coat cylinders and thermal cycle samples of IN738 and
                      CMSX-4. Thermal cycling samples are used to investigate the
                      thermal shock resistance of the thermal barrier coatings. In
                      addition to the microstructure of the topcoat, the
                      composition of the bondcoats has an impact on their
                      durability. By using ODS layers, the lifetime of the thermal
                      barrier coating (TBC) can be improved. Promising results can
                      be achieved by pre-oxidation of the bondcoats. By
                      heat-treating the bondcoats before coating the topcoat, a
                      thermally grown oxide (TGO) layer is formed, which makes it
                      possible to increase the lifetime of SPS coatings
                      significantly. This makes it possible for the first time to
                      produce single-layer SPS coatings that have comparable
                      lifetimes to other coating processes. The present work was
                      carried out within the framework of the Collaborative
                      Research Center SFB/Transregio 103 "From the atom to the
                      turbine blade".},
      cin          = {IEK-1},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {1241 - Gas turbines (POF4-124)},
      pid          = {G:(DE-HGF)POF4-1241},
      typ          = {PUB:(DE-HGF)3 / PUB:(DE-HGF)11},
      doi          = {10.34734/FZJ-2024-06139},
      url          = {https://juser.fz-juelich.de/record/1032300},
}