Effect of microstructure of a NiCoCrAlY coating fabricated by high-velocity air fuel on the isothermal oxidation

Jie Lu, Han Zhang, Ying Chen, Xiaofeng Zhao, Fangwei Guo, Ping Xiao

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Abstract

The effect of grain size and porosity of a NiCoCrAlY coating fabricated by high-velocity air fuel on the isothermal oxidation behavior is studied. To understand this effect, the microstructure of coating, the chemistry and microstructure of thermally grown oxides (TGO), the phase transformation of alumina, the oxidation rate, and the TGO stress are investigated. It is demonstrated in this study that the oxidation and spallation resistance of TGO are predominantly determined by the porosity rather than grain size for the long term oxidation, although the nanoscale γ-grains can facilitate the earlier establishment of α-Al2O3 scale.
Original languageEnglish
Number of pages14
JournalCorrosion Science
Volume159
Early online date30 Jul 2019
DOIs
Publication statusPublished - 1 Oct 2019

Keywords

  • NiCoCrAlY
  • Grain size
  • Porosity
  • Oxidation

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