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@INPROCEEDINGS{Hejrani:204894,
      author       = {Hejrani, Elham and Sebold, Doris and Mauer, Georg and
                      Naumenko, Dmitry and Vassen, Robert and Quadakkers, Willem
                      J.},
      title        = {{D}ifferences in {O}xidation {R}esistance of {MC}r{A}l{Y}
                      {C}oatings {M}anufactured by {L}ow {P}ressure and
                      {H}igh-{V}elocity {A}tmospheric {P}lasma {S}praying},
      reportid     = {FZJ-2015-05486},
      year         = {2015},
      note         = {First prize in the poster competition},
      abstract     = {Gordon Conference High Temperature CorrosionNew London,
                      USA, 26 – 31 July 2015Differences in Oxidation Resistance
                      of MCrAlY Coatings Manufactured by Low Pressure and
                      High-Velocity Atmospheric Plasma SprayingE. Hejrani1) , D.
                      Sebold2), G. Mauer2), D. Naumenko1), R. Vassen2), W.J.
                      Quadakkers1)Forschungszentrum Jülich, Institute for Energy
                      and Climate Research (IEK)52425 Jülich, D1) Microstructure
                      and Properties of Materials (IEK-2)2) Materials Synthesis
                      and Processing (IEK-1)In industrial gas turbines coatings of
                      the MCrAlY type (M = Co, Ni) are commonly used to protect
                      metallic components against damage by high temperature
                      oxidation and corrosion processes. They are also frequently
                      used as bond coats in ceramic thermal barrier coating
                      systems. Due to the high affinity to oxygen of the alloying
                      additions Al, Cr and especially Y, MCrAlY coatings are often
                      manufactured by low pressure plasma spraying (LPPS) to
                      minimize oxygen uptake of the coating and prevent oxidation
                      of the mentioned alloying elements during processing. Plasma
                      spraying at atmospheric conditions (APS) is a cost-effective
                      alternative if it would be possible to limit the oxygen
                      uptake as well as to obtain sufficiently dense coatings. In
                      the present investigation free standing MCrAlY coatings with
                      a thickness of approximately 3 mm were manufactured using a
                      three-cathode plasma torch with a high velocity nozzle and
                      adapted plasma parameters. The high particle velocities
                      result in reduced particle oxidation during flight and
                      contribute to coating densification by kinetic rather than
                      thermal energy. Free standing coatings with the same
                      composition were additionally manufactured by conventional
                      low pressure plasma spraying (LPPS).From the free standing
                      coatings rectangular specimens with a thickness of 2 and 0.6
                      mm were machined and investigated in respect to cyclic and
                      isothermal oxidation testing at 1100 and 1000°C. The
                      isothermal tests were carried out in a thermo-gravimetrical
                      analysis (TGA) facility to obtain detailed information about
                      oxidation kinetics. The use of specimens of different
                      thickness allowed estimating the differences in reservoir of
                      free, i.e. non-oxidized Y in the coatings and its effect on
                      mechanisms of surface scale formation. The coating
                      microstructures as well as external and internal oxidation
                      products were characterized by using a combination of
                      analysis methods such as light and electron optical
                      microscopy, energy and wave length dispersive x-ray analysis
                      (EDX/WDX), x-ray diffraction (XRD), glow discharge optical
                      emission spectroscopy (GDOES) as well as Laser Raman
                      Spectroscopy (LRS). Differences in scale growth rate and
                      adherence as function of coating manufacturing process and
                      specimen thickness will be illustrated and correlated with
                      the results of the detailed microstructural analyses.},
      month         = {Jul},
      date          = {2015-07-26},
      organization  = {Gordon Research Conference High
                       Temperature Corrosion, New London, NH
                       (USA), 26 Jul 2015 - 31 Jul 2015},
      subtyp        = {After Call},
      cin          = {IEK-1 / IEK-2},
      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)24},
      url          = {https://juser.fz-juelich.de/record/204894},
}