The effect of Pt content on γ-γ′ NiPtAl coatings

J. A. Haynes; B. A. Pint; Y. Zhang; I. G. Wright

doi:10.1016/j.surfcoat.2008.08.063

The effect of Pt content on γ-γ′ NiPtAl coatings

J. A. Haynes, B. A. Pint, Y. Zhang, I. G. Wright

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Abstract

This study investigated the impact of Pt content on the coating composition and subsequent oxidation behavior of γ-γ′ NiPtAl diffusion coatings. Coatings were fabricated by vacuum annealing electroplated Pt on single-crystal and directionally-solidified superalloy substrates. Specimens with 7 and 12 μm thick layers of electroplated Pt were annealed at 1100 or 1175 °C. Coating compositions were characterized to evaluate the distribution of Pt and Al as a function of annealing temperature and Pt thickness. Selected coatings were evaluated in cyclic oxidation at 1100 and 1150 °C. Coatings with higher Pt contents showed improvements in spallation resistance, particularly at 1100 °C for a directionally-solidified superalloy substrate with higher Hf and S contents.

Original language	English
Pages (from-to)	413-416
Number of pages	4
Journal	Surface and Coatings Technology
Volume	203
Issue number	5-7
DOIs	https://doi.org/10.1016/j.surfcoat.2008.08.063
State	Published - Dec 25 2008

Keywords

Aluminide coatings
Bond coatings
High temperature oxidation
Platinum coatings
Platinum effect
TBC

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10.1016/j.surfcoat.2008.08.063

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title = "The effect of Pt content on γ-γ′ NiPtAl coatings",

abstract = "This study investigated the impact of Pt content on the coating composition and subsequent oxidation behavior of γ-γ′ NiPtAl diffusion coatings. Coatings were fabricated by vacuum annealing electroplated Pt on single-crystal and directionally-solidified superalloy substrates. Specimens with 7 and 12 μm thick layers of electroplated Pt were annealed at 1100 or 1175 °C. Coating compositions were characterized to evaluate the distribution of Pt and Al as a function of annealing temperature and Pt thickness. Selected coatings were evaluated in cyclic oxidation at 1100 and 1150 °C. Coatings with higher Pt contents showed improvements in spallation resistance, particularly at 1100 °C for a directionally-solidified superalloy substrate with higher Hf and S contents.",

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T1 - The effect of Pt content on γ-γ′ NiPtAl coatings

AU - Haynes, J. A.

AU - Pint, B. A.

AU - Zhang, Y.

AU - Wright, I. G.

PY - 2008/12/25

Y1 - 2008/12/25

N2 - This study investigated the impact of Pt content on the coating composition and subsequent oxidation behavior of γ-γ′ NiPtAl diffusion coatings. Coatings were fabricated by vacuum annealing electroplated Pt on single-crystal and directionally-solidified superalloy substrates. Specimens with 7 and 12 μm thick layers of electroplated Pt were annealed at 1100 or 1175 °C. Coating compositions were characterized to evaluate the distribution of Pt and Al as a function of annealing temperature and Pt thickness. Selected coatings were evaluated in cyclic oxidation at 1100 and 1150 °C. Coatings with higher Pt contents showed improvements in spallation resistance, particularly at 1100 °C for a directionally-solidified superalloy substrate with higher Hf and S contents.

AB - This study investigated the impact of Pt content on the coating composition and subsequent oxidation behavior of γ-γ′ NiPtAl diffusion coatings. Coatings were fabricated by vacuum annealing electroplated Pt on single-crystal and directionally-solidified superalloy substrates. Specimens with 7 and 12 μm thick layers of electroplated Pt were annealed at 1100 or 1175 °C. Coating compositions were characterized to evaluate the distribution of Pt and Al as a function of annealing temperature and Pt thickness. Selected coatings were evaluated in cyclic oxidation at 1100 and 1150 °C. Coatings with higher Pt contents showed improvements in spallation resistance, particularly at 1100 °C for a directionally-solidified superalloy substrate with higher Hf and S contents.

KW - Aluminide coatings

KW - Bond coatings

KW - High temperature oxidation

KW - Platinum coatings

KW - Platinum effect

KW - TBC

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DO - 10.1016/j.surfcoat.2008.08.063

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VL - 203

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EP - 416

JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

IS - 5-7

ER -

The effect of Pt content on γ-γ′ NiPtAl coatings

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