Comparative performance of selected bond coats in advanced thermal barrier coating systems

H. M. Tawancy; N. Sridhar; N. M. Abbas; D. S. Rickerby

doi:10.1023/A:1004825932601

Comparative performance of selected bond coats in advanced thermal barrier coating systems

H. M. Tawancy^*
, N. Sridhar
, N. M. Abbas
, D. S. Rickerby

^*Corresponding author for this work

King Fahd University of Petroleum & Minerals

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

37 Scopus citations

Abstract

An investigation was carried out to determine the comparative performance of selected bond coats representing the diffusion aluminides and overlays in thermal barrier coating systems. Emphasis was placed upon oxidation behavior, thermal stability, and failure mechanism. Isothermal oxidation tests were carried out at temperatures in the range of 1000°C to 1150°C. Scanning electron microscopy combined with energy dispersive x-ray spectroscopy, x-ray diffraction, and transmission electron microscopy were used to characterize the coating microstructure. Among the bond coats examined, overlays exhibited the best performance followed by Pt-aluminides and simple aluminides for a given alloy substrate. However, for all types of bond coats, failure of the coating system occurred by decohesion of the oxide scale at the oxide-bond coat interface. All bond coats examined were found to be degraded by oxidation and interdiffusion with the alloy substrate permitting the formation of non-protective oxide scale near the bond coat surface. Platinum as well as active elements such as Hf and Y were identified as key elements in improving the performance of thermal barrier coating systems.

Original language	English
Pages (from-to)	3615-3629
Number of pages	15
Journal	Journal of Materials Science
Volume	35
Issue number	14
DOIs	https://doi.org/10.1023/A:1004825932601
State	Published - Jul 2000

Bibliographical note

Funding Information:
It is a pleasure to acknowledge the financial support of Rolls-Royce plc who also provided the material used in this study. Also, the support of the Research Institute of King Fahd University of Petroleum and Minerals where the characterization study was carried out is greatly appreciated.

ASJC Scopus subject areas

Ceramics and Composites
Materials Science (miscellaneous)
General Materials Science
Mechanics of Materials
Mechanical Engineering
Polymers and Plastics

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title = "Comparative performance of selected bond coats in advanced thermal barrier coating systems",

abstract = "An investigation was carried out to determine the comparative performance of selected bond coats representing the diffusion aluminides and overlays in thermal barrier coating systems. Emphasis was placed upon oxidation behavior, thermal stability, and failure mechanism. Isothermal oxidation tests were carried out at temperatures in the range of 1000°C to 1150°C. Scanning electron microscopy combined with energy dispersive x-ray spectroscopy, x-ray diffraction, and transmission electron microscopy were used to characterize the coating microstructure. Among the bond coats examined, overlays exhibited the best performance followed by Pt-aluminides and simple aluminides for a given alloy substrate. However, for all types of bond coats, failure of the coating system occurred by decohesion of the oxide scale at the oxide-bond coat interface. All bond coats examined were found to be degraded by oxidation and interdiffusion with the alloy substrate permitting the formation of non-protective oxide scale near the bond coat surface. Platinum as well as active elements such as Hf and Y were identified as key elements in improving the performance of thermal barrier coating systems.",

author = "Tawancy, \{H. M.\} and N. Sridhar and Abbas, \{N. M.\} and Rickerby, \{D. S.\}",

note = "Funding Information: It is a pleasure to acknowledge the financial support of Rolls-Royce plc who also provided the material used in this study. Also, the support of the Research Institute of King Fahd University of Petroleum and Minerals where the characterization study was carried out is greatly appreciated.",

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AU - Tawancy, H. M.

AU - Sridhar, N.

AU - Abbas, N. M.

AU - Rickerby, D. S.

N1 - Funding Information: It is a pleasure to acknowledge the financial support of Rolls-Royce plc who also provided the material used in this study. Also, the support of the Research Institute of King Fahd University of Petroleum and Minerals where the characterization study was carried out is greatly appreciated.

PY - 2000/7

Y1 - 2000/7

N2 - An investigation was carried out to determine the comparative performance of selected bond coats representing the diffusion aluminides and overlays in thermal barrier coating systems. Emphasis was placed upon oxidation behavior, thermal stability, and failure mechanism. Isothermal oxidation tests were carried out at temperatures in the range of 1000°C to 1150°C. Scanning electron microscopy combined with energy dispersive x-ray spectroscopy, x-ray diffraction, and transmission electron microscopy were used to characterize the coating microstructure. Among the bond coats examined, overlays exhibited the best performance followed by Pt-aluminides and simple aluminides for a given alloy substrate. However, for all types of bond coats, failure of the coating system occurred by decohesion of the oxide scale at the oxide-bond coat interface. All bond coats examined were found to be degraded by oxidation and interdiffusion with the alloy substrate permitting the formation of non-protective oxide scale near the bond coat surface. Platinum as well as active elements such as Hf and Y were identified as key elements in improving the performance of thermal barrier coating systems.

AB - An investigation was carried out to determine the comparative performance of selected bond coats representing the diffusion aluminides and overlays in thermal barrier coating systems. Emphasis was placed upon oxidation behavior, thermal stability, and failure mechanism. Isothermal oxidation tests were carried out at temperatures in the range of 1000°C to 1150°C. Scanning electron microscopy combined with energy dispersive x-ray spectroscopy, x-ray diffraction, and transmission electron microscopy were used to characterize the coating microstructure. Among the bond coats examined, overlays exhibited the best performance followed by Pt-aluminides and simple aluminides for a given alloy substrate. However, for all types of bond coats, failure of the coating system occurred by decohesion of the oxide scale at the oxide-bond coat interface. All bond coats examined were found to be degraded by oxidation and interdiffusion with the alloy substrate permitting the formation of non-protective oxide scale near the bond coat surface. Platinum as well as active elements such as Hf and Y were identified as key elements in improving the performance of thermal barrier coating systems.

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JO - Journal of Materials Science

JF - Journal of Materials Science

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ER -

Comparative performance of selected bond coats in advanced thermal barrier coating systems

Abstract

Bibliographical note

ASJC Scopus subject areas

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