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

doi:10.1016/j.corsci.2019.108126

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 language	English
Number of pages	14
Journal	Corrosion Science
Volume	159
Early online date	30 Jul 2019
DOIs	https://doi.org/10.1016/j.corsci.2019.108126
Publication status	Published - 1 Oct 2019

Keywords

NiCoCrAlY
Grain size
Porosity
Oxidation

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10.1016/j.corsci.2019.108126

Effect of microstructure of a NiCoCrAlY coating fabricated by high-velocity air fuel on the isothermal oxidation Accepted author manuscript, 8.28 MBLicence: CC BY-NC-ND

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

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.",

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author = "Jie Lu and Han Zhang and Ying Chen and Xiaofeng Zhao and Fangwei Guo and Ping Xiao",

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TY - JOUR

T1 - Effect of microstructure of a NiCoCrAlY coating fabricated by high-velocity air fuel on the isothermal oxidation

AU - Lu, Jie

AU - Zhang, Han

AU - Chen, Ying

AU - Zhao, Xiaofeng

AU - Guo, Fangwei

AU - Xiao, Ping

PY - 2019/10/1

Y1 - 2019/10/1

N2 - 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.

AB - 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.

KW - NiCoCrAlY

KW - Grain size

KW - Porosity

KW - Oxidation

U2 - 10.1016/j.corsci.2019.108126

DO - 10.1016/j.corsci.2019.108126

M3 - Article

SN - 0010-938X

VL - 159

JO - Corrosion Science

JF - Corrosion Science

ER -

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

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Keywords

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