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@ARTICLE{Ebert:138240,
      author       = {Ebert, Svenja Maria and Mücke, Robert and Mack, Daniel
                      Emil and Vaßen, Robert and Stöver, Detlev and Wobst, Tanja
                      and Gebhard, Susanne},
      title        = {{F}ailure mechanisms of magnesia alumina spinel abradable
                      coatings under thermal cyclic loading},
      journal      = {Journal of the European Ceramic Society},
      volume       = {33},
      number       = {15-16},
      issn         = {0955-2219},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2013-04420},
      pages        = {3335 - 3343},
      year         = {2013},
      abstract     = {Abradable coatings have been used in low- and high-pressure
                      sections of jet engine compressors for more than 40 years.
                      Today, they are also used in the high-pressure turbine of
                      jet engines and are gaining more interest for applications
                      in industrial gas turbines. They minimise the clearance
                      between the rotating blade tips and the stationary liners.
                      Aside from being abradable, the coatings have to be
                      mechanically stable and withstand high thermo-mechanical
                      loadings. A typical material used in engines today is
                      yttria-stabilised zirconia (YSZ). This material
                      advantageously combines a suitable thermal conductivity with
                      a high thermal expansion coefficient, but shows a
                      temperature capability limited to 1200 °C in long-term
                      applications. Typical abradable coating thicknesses are
                      above 1 mm. With increasing coating thickness and limited
                      cooling efficiency leading to high surface temperatures,
                      there is a risk of premature failure. As a result, new
                      ceramic materials have been developed with better
                      high-temperature capability. The present work investigates
                      an atmospheric plasma sprayed ceramic double-layer coating
                      system composed of 7YSZ as an intermediate layer and
                      magnesia alumina spinel as a top layer. This double-layer
                      system was sprayed onto disc-shaped Inconel 738 superalloy
                      substrates, which were coated with a vacuum plasma sprayed
                      MCrAlY bondcoat. The lifetime of the coating system was
                      assessed via thermal gradient cycling testing with surface
                      temperatures above 1400 °C. During cycling, the samples
                      showed a typical failure mechanism with exfoliation of thin
                      coating lamellae starting from the coating surface. This
                      failure mechanism was not observed in thermal barrier or
                      abradable coatings in the past. The failure mechanism was
                      analysed and mismatch stress calculations were carried out.},
      cin          = {IEK-1},
      ddc          = {660},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {122 - Power Plants (POF2-122)},
      pid          = {G:(DE-HGF)POF2-122},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000324901800051},
      doi          = {10.1016/j.jeurceramsoc.2013.06.021},
      url          = {https://juser.fz-juelich.de/record/138240},
}