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@PHDTHESIS{Guignard:128939,
      author       = {Guignard, Alexandre},
      title        = {{D}evelopment of thermal spray processes with liquid
                      feedstocks},
      volume       = {141},
      school       = {Ruhr-Universität Bochum},
      type         = {Dr.},
      address      = {Jülich},
      publisher    = {Forschungszentrum Jülich GmbH Zentralbibliothek, Verlag},
      reportid     = {FZJ-2013-00465},
      isbn         = {978-3-89336-788-7},
      series       = {Schriften des Forschungszentrums Jülich : Energie $\&$
                      Umwelt / Energy $\&$ Environment},
      pages        = {128 S.},
      year         = {2012},
      note         = {Record converted from JUWEL: 18.07.2013; Ruhr-Universität
                      Bochum, Diss., 2012},
      abstract     = {The manufacture of submicrometer-structured coatings by
                      thermal spraying is currently a subject of increasing
                      research efforts in order to obtain unique and often
                      enhanced properties compared to conventional coatings.
                      Injecting suspensions of submicron ceramic particles into
                      the plasma jet or the flame enables to deposit
                      finely-structured coatings. Such fine microstructures are
                      desired for a large range of applications, such as in the
                      field of thermal barrier coatings (TBCs) for gas turbines.
                      Suspension plasma sprayed (SPS) TBCs show unique mechanical,
                      thermal and optical properties compared to conventional
                      atmospheric plasma sprayed (APS) TBCs. They have thus the
                      potential of providing increased TBC performances under
                      severe thermo-mechanical loading. The benefits of
                      SPS-deposited yttria-stabilized zirconia (YSZ) TBCs are
                      demonstrated, such as very fine porosity, high segmentation
                      crack density and low Young’s modulus. Although
                      segmentation cracks survive during thermal cycling at
                      1400°C, it was shown that the sintering tendency is high at
                      such temperature exposure. An improvement of the SPS YSZ
                      microstructure was realized by reducing significantly the
                      fraction of unmolten clusters. However, this improvement was
                      not reflected in thermal cycling performances in a burner
                      rig. Further experimental investigations with modified
                      spraying parameters yielded a columnar-structured YSZ
                      coating. This type of microstructure is advantageous for TBC
                      applications since intercolumnar voids can comply with
                      in-plane stresses during thermal cycling, similar to
                      electron beam physical vapor deposited (EB-PVD) TBCs.
                      Further investigations on the SPS process with lanthanum
                      zirconate (La$_{2}$Zr$_{2}$O$_{7}$) as a new promising
                      material for TBCs yielded almost stoichiometric coatings by
                      preventing lanthania evaporation with at the same time
                      columnar-type structure being promising in terms of
                      compliance. The deposition of TiO$_{2}$ coatings by SPS was
                      also investigated. A large range of various microstructures
                      was produced and specific anatase phase content can be
                      tailored. Tree-like columnar structures are particularly
                      attractive for their large surface area that promotes
                      photoactivity. SPS appears as a highly versatile process
                      with great potential for the manufacture of these coatings.},
      keywords     = {Dissertation (GND)},
      cin          = {IEK-1},
      ddc          = {500},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {122 - Power Plants (POF2-122)},
      pid          = {G:(DE-HGF)POF2-122},
      typ          = {PUB:(DE-HGF)11 / PUB:(DE-HGF)3},
      url          = {https://juser.fz-juelich.de/record/128939},
}