On the Microstructural Development in Platinum-Modified Nickel-Aluminide Bond Coats

S. Darzens; Anette M Karlsson

doi:10.1016/j.surfcoat.2003.09.001

On the Microstructural Development in Platinum-Modified Nickel-Aluminide Bond Coats

S. Darzens
, Anette M Karlsson

University of Delaware

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

Abstract

A numerical procedure for simulating the distortions exhibited by a thermally grown oxide (TGO) upon temperature cycling has been adapted to incorporate the microstructure of the bond coat. The focus is on the dual phase β/γ′ microstructure that develops upon oxidation of a system with a Pt-aluminide bond coat. The results reveal that the presence of the γ′-phase next to the TGO reduces its distortion locally, because of the superior high-temperature strength of γ′, relative to β. Conversely, in regions where the β-phase exists adjacent to the TGO, it distorts and the TGO propagates downward, while simultaneously lengthening. These results from the simulations are in direct correspondence with experimental observations.

Original language	American English
Journal	Surface and Coatings Technology
Volume	177
DOIs	https://doi.org/10.1016/j.surfcoat.2003.09.001
State	Published - Jan 30 2004

Keywords

Elastic– plastic material; Finite elements; Thermal barrier coatings; Thermal cycling; Oxidation

Disciplines

Mechanical Engineering

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10.1016/j.surfcoat.2003.09.001License: CC BY

On the Microstructural Development in Platinum-Modified Nickel-AlFinal published version, 1.99 MBLicense: CC BY

http://journals.ohiolink.edu/ejc/article.cgi?issn=02578972&issue=v177-178inone_c&article=108_otmdipnbc

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title = "On the Microstructural Development in Platinum-Modified Nickel-Aluminide Bond Coats",

abstract = " A numerical procedure for simulating the distortions exhibited by a thermally grown oxide (TGO) upon temperature cycling has been adapted to incorporate the microstructure of the bond coat. The focus is on the dual phase β/γ′ microstructure that develops upon oxidation of a system with a Pt-aluminide bond coat. The results reveal that the presence of the γ′-phase next to the TGO reduces its distortion locally, because of the superior high-temperature strength of γ′, relative to β. Conversely, in regions where the β-phase exists adjacent to the TGO, it distorts and the TGO propagates downward, while simultaneously lengthening. These results from the simulations are in direct correspondence with experimental observations.",

keywords = "Elastic– plastic material; Finite elements; Thermal barrier coatings; Thermal cycling; Oxidation",

author = "S. Darzens and Karlsson, \{Anette M\}",

note = "Darzens, S., and Karlsson, A. M., 2004, {"}On the Microstructural Development in Platinum-Modified Nickel-Aluminide Bond Coats,{"} Surface and Coatings Technology, 177-178pp. 108-112.",

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AU - Darzens, S.

AU - Karlsson, Anette M

N1 - Darzens, S., and Karlsson, A. M., 2004, "On the Microstructural Development in Platinum-Modified Nickel-Aluminide Bond Coats," Surface and Coatings Technology, 177-178pp. 108-112.

PY - 2004/1/30

Y1 - 2004/1/30

N2 - A numerical procedure for simulating the distortions exhibited by a thermally grown oxide (TGO) upon temperature cycling has been adapted to incorporate the microstructure of the bond coat. The focus is on the dual phase β/γ′ microstructure that develops upon oxidation of a system with a Pt-aluminide bond coat. The results reveal that the presence of the γ′-phase next to the TGO reduces its distortion locally, because of the superior high-temperature strength of γ′, relative to β. Conversely, in regions where the β-phase exists adjacent to the TGO, it distorts and the TGO propagates downward, while simultaneously lengthening. These results from the simulations are in direct correspondence with experimental observations.

AB - A numerical procedure for simulating the distortions exhibited by a thermally grown oxide (TGO) upon temperature cycling has been adapted to incorporate the microstructure of the bond coat. The focus is on the dual phase β/γ′ microstructure that develops upon oxidation of a system with a Pt-aluminide bond coat. The results reveal that the presence of the γ′-phase next to the TGO reduces its distortion locally, because of the superior high-temperature strength of γ′, relative to β. Conversely, in regions where the β-phase exists adjacent to the TGO, it distorts and the TGO propagates downward, while simultaneously lengthening. These results from the simulations are in direct correspondence with experimental observations.

KW - Elastic– plastic material; Finite elements; Thermal barrier coatings; Thermal cycling; Oxidation

UR - https://engagedscholarship.csuohio.edu/enme_facpub/139

U2 - 10.1016/j.surfcoat.2003.09.001

DO - 10.1016/j.surfcoat.2003.09.001

M3 - Article

VL - 177

JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

ER -

On the Microstructural Development in Platinum-Modified Nickel-Aluminide Bond Coats

Abstract

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