Influence of Ruthenium on the Oxidation Behavior of Platinum-Rich γ–γ′ Bond Coats and Their Performance in Thermal Barrier Coatings Deposited on a Nickel-Base Superalloy

H. M. Tawancy; A. I. Mohammed; L. M. Al-Hadhrami; H. Dafalla; F. K. Alyousef

doi:10.1007/s11085-015-9568-x

Influence of Ruthenium on the Oxidation Behavior of Platinum-Rich γ–γ′ Bond Coats and Their Performance in Thermal Barrier Coatings Deposited on a Nickel-Base Superalloy

H. M. Tawancy^*
, A. I. Mohammed
, L. M. Al-Hadhrami
, H. Dafalla
, F. K. Alyousef

^*Corresponding author for this work

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

5 Scopus citations

Abstract

We show that a γ–γ′ bond coat synthesized by diffusing 5 μm layer of Pt and 5 μm layer of Ru into a Ni-base superalloy has oxidation resistance and thermal barrier coating performance approaching those provided by the conventional bond coat synthesized by 8 μm layer of Pt. However, this is found to be dependent upon the deposition sequence of the Pt and Ru layers due to the corresponding significant effect on bond coat microstructure. Deposition of Pt followed by Ru results in a microstructure similar to that of the conventional bond coat. Reversing the deposition sequence results in a surface layer of Cr-rich sigma phase, which precludes the formation of protective layer of Al₂O₃. It is concluded that it is possible to substitute some of the Pt consumption with the less expensive Ru while still maintaining adequate properties.

Original language	English
Pages (from-to)	527-539
Number of pages	13
Journal	Oxidation of Metals
Volume	84
Issue number	5-6
DOIs	https://doi.org/10.1007/s11085-015-9568-x
State	Published - 23 Jul 2015

Bibliographical note

Publisher Copyright:
© 2015, Springer Science+Business Media New York.

Keywords

Bond coats
Electron microscopy
Oxidation
Ruthenium
Thermal barrier coatings

ASJC Scopus subject areas

Inorganic Chemistry
Metals and Alloys
Materials Chemistry

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title = "Influence of Ruthenium on the Oxidation Behavior of Platinum-Rich γ{\textendash}γ′ Bond Coats and Their Performance in Thermal Barrier Coatings Deposited on a Nickel-Base Superalloy",

abstract = "We show that a γ{\textendash}γ′ bond coat synthesized by diffusing 5 μm layer of Pt and 5 μm layer of Ru into a Ni-base superalloy has oxidation resistance and thermal barrier coating performance approaching those provided by the conventional bond coat synthesized by 8 μm layer of Pt. However, this is found to be dependent upon the deposition sequence of the Pt and Ru layers due to the corresponding significant effect on bond coat microstructure. Deposition of Pt followed by Ru results in a microstructure similar to that of the conventional bond coat. Reversing the deposition sequence results in a surface layer of Cr-rich sigma phase, which precludes the formation of protective layer of Al2O3. It is concluded that it is possible to substitute some of the Pt consumption with the less expensive Ru while still maintaining adequate properties.",

keywords = "Bond coats, Electron microscopy, Oxidation, Ruthenium, Thermal barrier coatings",

author = "Tawancy, \{H. M.\} and Mohammed, \{A. I.\} and Al-Hadhrami, \{L. M.\} and H. Dafalla and Alyousef, \{F. K.\}",

note = "Publisher Copyright: {\textcopyright} 2015, Springer Science+Business Media New York.",

year = "2015",

month = jul,

day = "23",

doi = "10.1007/s11085-015-9568-x",

language = "English",

volume = "84",

pages = "527--539",

journal = "Oxidation of Metals",

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Influence of Ruthenium on the Oxidation Behavior of Platinum-Rich γ–γ′ Bond Coats and Their Performance in Thermal Barrier Coatings Deposited on a Nickel-Base Superalloy. / Tawancy, H. M.; Mohammed, A. I.; Al-Hadhrami, L. M. et al.
In: Oxidation of Metals, Vol. 84, No. 5-6, 23.07.2015, p. 527-539.

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

TY - JOUR

T1 - Influence of Ruthenium on the Oxidation Behavior of Platinum-Rich γ–γ′ Bond Coats and Their Performance in Thermal Barrier Coatings Deposited on a Nickel-Base Superalloy

AU - Tawancy, H. M.

AU - Mohammed, A. I.

AU - Al-Hadhrami, L. M.

AU - Dafalla, H.

AU - Alyousef, F. K.

PY - 2015/7/23

Y1 - 2015/7/23

N2 - We show that a γ–γ′ bond coat synthesized by diffusing 5 μm layer of Pt and 5 μm layer of Ru into a Ni-base superalloy has oxidation resistance and thermal barrier coating performance approaching those provided by the conventional bond coat synthesized by 8 μm layer of Pt. However, this is found to be dependent upon the deposition sequence of the Pt and Ru layers due to the corresponding significant effect on bond coat microstructure. Deposition of Pt followed by Ru results in a microstructure similar to that of the conventional bond coat. Reversing the deposition sequence results in a surface layer of Cr-rich sigma phase, which precludes the formation of protective layer of Al2O3. It is concluded that it is possible to substitute some of the Pt consumption with the less expensive Ru while still maintaining adequate properties.

AB - We show that a γ–γ′ bond coat synthesized by diffusing 5 μm layer of Pt and 5 μm layer of Ru into a Ni-base superalloy has oxidation resistance and thermal barrier coating performance approaching those provided by the conventional bond coat synthesized by 8 μm layer of Pt. However, this is found to be dependent upon the deposition sequence of the Pt and Ru layers due to the corresponding significant effect on bond coat microstructure. Deposition of Pt followed by Ru results in a microstructure similar to that of the conventional bond coat. Reversing the deposition sequence results in a surface layer of Cr-rich sigma phase, which precludes the formation of protective layer of Al2O3. It is concluded that it is possible to substitute some of the Pt consumption with the less expensive Ru while still maintaining adequate properties.

KW - Bond coats

KW - Electron microscopy

KW - Oxidation

KW - Ruthenium

KW - Thermal barrier coatings

UR - https://www.scopus.com/pages/publications/84945440919

U2 - 10.1007/s11085-015-9568-x

DO - 10.1007/s11085-015-9568-x

M3 - Article

AN - SCOPUS:84945440919

SN - 0030-770X

VL - 84

SP - 527

EP - 539

JO - Oxidation of Metals

JF - Oxidation of Metals

IS - 5-6

ER -

Influence of Ruthenium on the Oxidation Behavior of Platinum-Rich γ–γ′ Bond Coats and Their Performance in Thermal Barrier Coatings Deposited on a Nickel-Base Superalloy

Abstract

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Keywords

ASJC Scopus subject areas

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