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@ARTICLE{Hejrani:826837,
      author       = {Hejrani, E. and Sebold, D. and Nowak, W. J. and Mauer, G.
                      and Naumenko, D. and Vassen, Robert and Quadakkers, W. J.},
      title        = {{I}sothermal and cyclic oxidation behavior of free standing
                      {MC}r{A}l{Y} coatings manufactured by high-velocity
                      atmospheric plasma spraying},
      journal      = {Surface and coatings technology},
      volume       = {313},
      issn         = {0257-8972},
      address      = {Amsterdam [u.a.]},
      publisher    = {Elsevier Science},
      reportid     = {FZJ-2017-01053},
      pages        = {191-201},
      year         = {2017},
      abstract     = {In the present paper the high temperature oxidation
                      behavior of a free standing NiCoCrAlY coating produced by
                      high-velocity atmospheric plasma spraying (HV-APS) is
                      investigated and compared with that produced by conventional
                      low pressure plasma spraying (LPPS). Isothermal
                      thermogravimetric experiments at 1000 and 1100 °C in
                      synthetic air revealed a lower oxidation rate of the HV-APS
                      than the LPPS coating. Both coatings formed oxide scales
                      based on alpha alumina, however, in the LPPS coating
                      incorporation of coarse mixed Y/Al-oxide pegs into the scale
                      occurred, increasing the oxidation rate by providing short
                      circuit paths for oxygen diffusion probably due to higher
                      diffusivities in the mixed oxide and/or along the interfaces
                      between mixed oxide and alumina. In the HV-APS coatings most
                      of the yttrium was tied-up in sub-μm Y-containing oxide
                      particles and only minor amounts of mixed Y/Al oxide
                      precipitates were found in the alumina surface scale. Cyclic
                      air oxidation tests at 1100 °C revealed a lower oxidation
                      rate and better scale adherence for the HV-APS coating.The
                      results thus show that HV-APS is a promising method for the
                      processing of MCrAlY coatings. The specific yttrium
                      distribution in form of fine oxide precipitates in the
                      HV-APS material prevents the formation of deleterious Y-rich
                      oxide pegs and promotes formation of a slowly growing,
                      protective alumina scale with excellent adherence.},
      cin          = {IEK-1 / IEK-2},
      ddc          = {620},
      cid          = {I:(DE-Juel1)IEK-1-20101013 / I:(DE-Juel1)IEK-2-20101013},
      pnm          = {113 - Methods and Concepts for Material Development
                      (POF3-113)},
      pid          = {G:(DE-HGF)POF3-113},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000398873100024},
      doi          = {10.1016/j.surfcoat.2017.01.081},
      url          = {https://juser.fz-juelich.de/record/826837},
}