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@ARTICLE{Bakan:1005227,
      author       = {Bakan, Emine and Vaßen, Robert},
      title        = {{C}rack healing mechanisms in atmospheric plasma sprayed
                      {Y}b-silicate coatings during post-process heat treatment},
      journal      = {Journal of the European Ceramic Society},
      volume       = {43},
      number       = {8},
      issn         = {0955-2219},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2023-01375},
      pages        = {3684-3693},
      year         = {2023},
      abstract     = {The microstructural evolution of partially amorphous,
                      atmospheric plasma-sprayed Yb-silicate coatings was
                      investigated after heat treatment (HT, 1300 °C). Open
                      porosity as well as crack area and widths in the coatings
                      were characterized. A correlation was found between the
                      increasing amorphous content of the as-sprayed coatings and
                      the reduction in crack area due to crack healing after HT.
                      Characterization results also suggested larger crack widths
                      in the coatings after HT. The first crack-healing mechanism
                      proposed was the capillarity-driven viscous flow of the
                      amorphous phase in the coatings. It was experimentally shown
                      that viscous flow-driven crack spheroidization (crack width
                      enlargement), and crack healing started in the coatings at
                      1050 °C. Secondly, metastable to stable phase
                      transformation (> 1100 °C) induced expansion in the
                      constrained coatings was discussed as a crack healing
                      mechanism. Finally, a two-step heat treatment was designed
                      to prevent crack width enlargement during HT resulting in
                      reduced porosity.},
      cin          = {IEK-1},
      ddc          = {660},
      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:000951698900001},
      doi          = {10.1016/j.jeurceramsoc.2023.02.005},
      url          = {https://juser.fz-juelich.de/record/1005227},
}