Synthesis and oxidation performance of Al-enriched γ + γ′ coatings on Ni-based superalloys via secondary aluminizing

J. P. Stacy; Y. Zhang; B. A. Pint; J. A. Haynes; B. T. Hazel; B. A. Nagaraj

doi:10.1016/j.surfcoat.2007.06.053

Synthesis and oxidation performance of Al-enriched γ + γ′ coatings on Ni-based superalloys via secondary aluminizing

J. P. Stacy, Y. Zhang, B. A. Pint, J. A. Haynes, B. T. Hazel, B. A. Nagaraj

Research output: Contribution to journal › Article › peer-review

33 Scopus citations

Abstract

"Simple" Pt-enriched γ + γ′ coatings (16-19 at.% Al) were fabricated on René 142 and single-crystal N5 Ni-based superalloys by electroplating a thin layer of Pt followed by a diffusion treatment in vacuum at 1175 °C. By introducing a secondary short-term aluminizing step via pack cementation with NaCl activator, "enriched" γ + γ′ coatings were achieved with an increased Al content (∼ 22 at.% Al). The changes in composition profiles between the simple and "enriched" γ + γ′ coatings were discussed. Incorporation of reactive elements, such as Hf, into the γ + γ′ coating during the aluminizing process also was explored. The cyclic oxidation performance of the "enriched" γ₊ γ′ coatings was evaluated at 1100°C.

Original language	English
Pages (from-to)	632-636
Number of pages	5
Journal	Surface and Coatings Technology
Volume	202
Issue number	4-7
DOIs	https://doi.org/10.1016/j.surfcoat.2007.06.053
State	Published - Dec 15 2007

Funding

The authors would like to acknowledge K.M. Cooley, G.W. Garner, and L.R. Walker at Oak Ridge National Laboratory (ORNL) and L.R. Liu at Tennessee Technological University (TTU) for assisting with the experimental work, and I.G. Wright and P.F. Tortorelli at ORNL for reviewing the manuscript. This research is sponsored by the National Science Foundation - GOALI Program under Grant No. 0504566. Additional support is from the U.S. Department of Energy, Fossil Energy Advanced Materials Research Program, under contract DE-AC05-00OR22725 with UT-Battelle LLC and subcontract 4000032193 with TTU and the SHaRE User Facility by the Division of Materials Sciences and Technology.

Keywords

Aluminizing
Bond coat
Oxidation
Pack cementation
γ + γ′ two-phase coating

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10.1016/j.surfcoat.2007.06.053

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abstract = "{"}Simple{"} Pt-enriched γ + γ′ coatings (16-19 at.% Al) were fabricated on Ren{\'e} 142 and single-crystal N5 Ni-based superalloys by electroplating a thin layer of Pt followed by a diffusion treatment in vacuum at 1175 °C. By introducing a secondary short-term aluminizing step via pack cementation with NaCl activator, {"}enriched{"} γ + γ′ coatings were achieved with an increased Al content (∼ 22 at.% Al). The changes in composition profiles between the simple and {"}enriched{"} γ + γ′ coatings were discussed. Incorporation of reactive elements, such as Hf, into the γ + γ′ coating during the aluminizing process also was explored. The cyclic oxidation performance of the {"}enriched{"} γ + γ′ coatings was evaluated at 1100°C.",

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T1 - Synthesis and oxidation performance of Al-enriched γ + γ′ coatings on Ni-based superalloys via secondary aluminizing

AU - Stacy, J. P.

AU - Zhang, Y.

AU - Pint, B. A.

AU - Haynes, J. A.

AU - Hazel, B. T.

AU - Nagaraj, B. A.

PY - 2007/12/15

Y1 - 2007/12/15

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AB - "Simple" Pt-enriched γ + γ′ coatings (16-19 at.% Al) were fabricated on René 142 and single-crystal N5 Ni-based superalloys by electroplating a thin layer of Pt followed by a diffusion treatment in vacuum at 1175 °C. By introducing a secondary short-term aluminizing step via pack cementation with NaCl activator, "enriched" γ + γ′ coatings were achieved with an increased Al content (∼ 22 at.% Al). The changes in composition profiles between the simple and "enriched" γ + γ′ coatings were discussed. Incorporation of reactive elements, such as Hf, into the γ + γ′ coating during the aluminizing process also was explored. The cyclic oxidation performance of the "enriched" γ + γ′ coatings was evaluated at 1100°C.

KW - Aluminizing

KW - Bond coat

KW - Oxidation

KW - Pack cementation

KW - γ + γ′ two-phase coating

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VL - 202

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JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

IS - 4-7

ER -

Synthesis and oxidation performance of Al-enriched γ + γ′ coatings on Ni-based superalloys via secondary aluminizing

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Keywords

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