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@ARTICLE{Koch:907128,
      author       = {Koch, Denise and Mack, Daniel E. and Vaßen, Robert},
      title        = {{D}egradation and lifetime of self-healing thermal barrier
                      coatings containing {M}o{S}i2 as self-healing particles in
                      thermo-cycling testing},
      journal      = {Surface and coatings technology},
      volume       = {437},
      issn         = {0257-8972},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2022-01855},
      pages        = {128353 -},
      year         = {2022},
      abstract     = {Yttria-stabilized zirconia (YSZ) is the state-of-the-art
                      top coat material for thermal barrier coatings (TBCs)
                      applied on highly loaded gas turbine parts. During operation
                      at high temperatures, stresses are induced by the thermal
                      expansion coefficient mismatch between the ceramic TBC and
                      the metallic substrate. As a consequence cracks can grow,
                      propagate and finally lead to a spallation of the top coat.
                      Using atmospheric plasma spraying (APS), so-called
                      self-healing MoSi2 particles can be incorporated into the
                      YSZ matrix to mitigate the propagation of cracks leading to
                      a lifetime gain and possibly higher temperature capability
                      of the TBC. In the present work, the healing process is
                      realized by the oxidation of the self-healing particles,
                      which introduces a volume expansion by a formation of
                      reaction products, which can seal the cracks. The
                      self-healing particles were introduced within the first 150
                      μm of the YSZ coating matrix immediately on top of the bond
                      coat. The degradation and lifetime of such systems were
                      studied in furnace cycling and in burner rig tests, in which
                      a temperature gradient through the sample was applied. The
                      lifetime of the self-healing coatings was then compared to
                      the lifetime of an YSZ coating without self-healing
                      particles. In burner rig tests a clear lifetime extension of
                      the self-healing TBCs was observed. The origin of this
                      different behavior was investigated by microstructural
                      analysis in scanning electron microscopy. A further insight
                      into the failure mechanisms was gained by the analysis of a
                      self-healing TBC cycled in a furnace cycling test only for
                      about $55\%$ of its expected lifetime.},
      cin          = {IEK-1},
      ddc          = {670},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {1241 - Gas turbines (POF4-124)},
      pid          = {G:(DE-HGF)POF4-1241},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000787892400002},
      doi          = {10.1016/j.surfcoat.2022.128353},
      url          = {https://juser.fz-juelich.de/record/907128},
}