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@ARTICLE{Steinke:12315,
      author       = {Steinke, T. and Sebold, D. and Mack, D. E. and Vaßen, R.
                      and Stöver, D.},
      title        = {{A} novel test approach for plasma-sprayed coatings tested
                      simultaneously under {CMAS} and thermal gradient cycling
                      conditions},
      journal      = {Surface and coatings technology},
      volume       = {205},
      issn         = {0257-8972},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {PreJuSER-12315},
      pages        = {2287 - 2295},
      year         = {2010},
      note         = {Record converted from VDB: 12.11.2012},
      abstract     = {Plasma-sprayed ceramic coatings, used as thermal barrier or
                      abradable coatings in high-pressure stages of gas turbines,
                      are exposed to high thermo-mechanical loading due to harsh
                      operating conditions. Under certain conditions they also
                      have to withstand attack by
                      calcium-magnesium-alumino-silicate (CMAS) deposits resulting
                      from the ingestion of siliceous minerals with the intake
                      air.Resistance to this kind of attack becomes more important
                      at higher temperatures, when the melting temperature of the
                      CMAS deposits is exceeded and a penetration into the coating
                      microstructural features (cracks and pores) can take place.
                      During cooling the CMAS solidifies and the coating loses its
                      strain tolerance, which can lead to coating failure.
                      Although the basic principles of failure seem to be
                      understood, a detailed analysis of the mechanisms and the
                      possibilities of avoiding delamination are still lacking,
                      especially because there are as yet no adequate test
                      beds.This paper investigates the possibility of testing such
                      coatings in a burner rig test facility under thermal
                      gradient cycling conditions and at the same time CMAS
                      deposition. This novel and unique test approach promises a
                      coating screening and characterization test under service
                      conditions. The CMAS rig was established because the test
                      conditions simulated here are closer to actual engine
                      conditions, as compared to previous tests with primarily
                      CMAS deposition and subsequent thermal furnace testing.The
                      experimental setup of this new test approach is described
                      and the applicability is confirmed. Furthermore, a first
                      evaluation for plasma-sprayed coatings is presented. A
                      significantly reduced lifetime was found for samples tested
                      with CMAS attack in comparison to tests with water
                      deposition only. The lifetime was also reduced compared to
                      older results without any corrosive media. A decrease of
                      nearly two orders of magnitude was found. A microstructural
                      evaluation of the coatings is presented and the mechanisms
                      and reasons for the very early failure are discussed. (C)
                      2010 Elsevier B.V. All rights reserved.},
      keywords     = {J (WoSType)},
      cin          = {IEK-1},
      ddc          = {620},
      cid          = {I:(DE-Juel1)IEK-1-20101013},
      pnm          = {Rationelle Energieumwandlung},
      pid          = {G:(DE-Juel1)FUEK402},
      shelfmark    = {Materials Science, Coatings $\&$ Films / Physics, Applied},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000286343100067},
      doi          = {10.1016/j.surfcoat.2010.09.008},
      url          = {https://juser.fz-juelich.de/record/12315},
}