Superior oxidation and spallation resistant NiCoCrAlY bond coat via homogenizing the yttrium distribution

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

doi:10.1016/j.corsci.2019.108145

Superior oxidation and spallation resistant NiCoCrAlY bond coat via homogenizing the yttrium distribution

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

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Abstract

We present a novel approach to significantly improve the oxidation and spallation resistance of a NiCoCrAlY bond coat by homogenizing the yttrium distribution via powder milling and subsequent spark plasma sintering. The NiCoCrAlY bond coat fabricated by this method exhibits a much lower oxidation rate and a significantly better spallation resistance after isothermal oxidation at 1150 °C, compared with the counterpart fabricated from the un-milled powder. To understand the improvement in oxidation resistance, the microstructure of the bond coats, the chemistry and microstructure of the thermally grown oxides (TGOs), the TGO stresses and the interfacial chemistry are systemically investigated.

Original language	English
Journal	Corrosion Science
Early online date	9 Aug 2019
DOIs	https://doi.org/10.1016/j.corsci.2019.108145
Publication status	Published - 1 Oct 2019

Keywords

NiCoCrAlY
Yttrium distribution
Oxidation
Spallation
Lifetime

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10.1016/j.corsci.2019.108145

Superior oxidation and spallation resistant NiCoCrAlY bond coat via homogenizing the yttrium distribution Accepted author manuscript, 14.3 MBLicence: CC BY-NC-ND

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title = "Superior oxidation and spallation resistant NiCoCrAlY bond coat via homogenizing the yttrium distribution",

abstract = "We present a novel approach to significantly improve the oxidation and spallation resistance of a NiCoCrAlY bond coat by homogenizing the yttrium distribution via powder milling and subsequent spark plasma sintering. The NiCoCrAlY bond coat fabricated by this method exhibits a much lower oxidation rate and a significantly better spallation resistance after isothermal oxidation at 1150 °C, compared with the counterpart fabricated from the un-milled powder. To understand the improvement in oxidation resistance, the microstructure of the bond coats, the chemistry and microstructure of the thermally grown oxides (TGOs), the TGO stresses and the interfacial chemistry are systemically investigated.",

keywords = "NiCoCrAlY, Yttrium distribution, Oxidation, Spallation, Lifetime",

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

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journal = "Corrosion Science",

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T1 - Superior oxidation and spallation resistant NiCoCrAlY bond coat via homogenizing the yttrium distribution

AU - Lu, Jie

AU - Chen, Ying

AU - Zhang, Han

AU - Zhao, Chunshan

AU - Zhao, Xiaofeng

AU - Guo, Fangwei

AU - Xiao, Ping

PY - 2019/10/1

Y1 - 2019/10/1

N2 - We present a novel approach to significantly improve the oxidation and spallation resistance of a NiCoCrAlY bond coat by homogenizing the yttrium distribution via powder milling and subsequent spark plasma sintering. The NiCoCrAlY bond coat fabricated by this method exhibits a much lower oxidation rate and a significantly better spallation resistance after isothermal oxidation at 1150 °C, compared with the counterpart fabricated from the un-milled powder. To understand the improvement in oxidation resistance, the microstructure of the bond coats, the chemistry and microstructure of the thermally grown oxides (TGOs), the TGO stresses and the interfacial chemistry are systemically investigated.

AB - We present a novel approach to significantly improve the oxidation and spallation resistance of a NiCoCrAlY bond coat by homogenizing the yttrium distribution via powder milling and subsequent spark plasma sintering. The NiCoCrAlY bond coat fabricated by this method exhibits a much lower oxidation rate and a significantly better spallation resistance after isothermal oxidation at 1150 °C, compared with the counterpart fabricated from the un-milled powder. To understand the improvement in oxidation resistance, the microstructure of the bond coats, the chemistry and microstructure of the thermally grown oxides (TGOs), the TGO stresses and the interfacial chemistry are systemically investigated.

KW - NiCoCrAlY

KW - Yttrium distribution

KW - Oxidation

KW - Spallation

KW - Lifetime

U2 - 10.1016/j.corsci.2019.108145

DO - 10.1016/j.corsci.2019.108145

M3 - Article

SN - 0010-938X

JO - Corrosion Science

JF - Corrosion Science

ER -

Superior oxidation and spallation resistant NiCoCrAlY bond coat via homogenizing the yttrium distribution

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Keywords

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