Microstructural degradation of Electron Beam-Physical Vapour Deposition Thermal Barrier Coating during thermal cycling tracked by X-ray micro-computed tomography

Xun Zhang; Yang Zhao; Philip Withers; Ping Xiao

doi:10.1016/j.scriptamat.2018.04.010

Microstructural degradation of Electron Beam-Physical Vapour Deposition Thermal Barrier Coating during thermal cycling tracked by X-ray micro-computed tomography

Xun Zhang, Yang Zhao, Philip Withers, Ping Xiao

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Abstract

The degradation of an Electron Beam-Physical Vapour Deposition Thermal Barrier Coating caused by thermal cycling at 1150 °C has been followed in 3D non-destructively by time-lapse X-ray micro-computed tomography (μ-CT). Quantitative analysis of X-ray μ-CT virtual cross-sections on small samples is validated by destructive cross-sectional scanning electron microscopy (SEM) micrographs of larger ones. The evolution of thermally-grown oxide (TGO) is quantified. The TGO/bond coat interface roughness is measured in 3D. No
significant rumpling is observed. Undulations are found locally at the interface of the as-deposited sample. Such undulations can increase in amplitude during cycling providing locations for interfacial cracks to initiate.

Original language	English
Journal	Scripta Materialia
Early online date	19 Apr 2018
DOIs	https://doi.org/10.1016/j.scriptamat.2018.04.010
Publication status	Published - 2018

Keywords

High temperature
Turbine blade
β-(Ni, Pt)Al
Interface
Non-destructive

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10.1016/j.scriptamat.2018.04.010

SMM-18-432R1Accepted author manuscript, 617 KB

Structural Evolution across multiple time and length scales
Withers, P. (PI), Cartmell, S. (CoI), Cernik, R. (CoI), Derby, B. (CoI), Eichhorn, S. (CoI), Freemont, A. (CoI), Hollis, C. (CoI), Mummery, P. (CoI), Sherratt, M. (CoI), Thompson, G. (CoI) & Watts, D. (CoI)
1/06/11 → 31/05/16
Project: Research

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title = "Microstructural degradation of Electron Beam-Physical Vapour Deposition Thermal Barrier Coating during thermal cycling tracked by X-ray micro-computed tomography",

abstract = "The degradation of an Electron Beam-Physical Vapour Deposition Thermal Barrier Coating caused by thermal cycling at 1150 °C has been followed in 3D non-destructively by time-lapse X-ray micro-computed tomography (μ-CT). Quantitative analysis of X-ray μ-CT virtual cross-sections on small samples is validated by destructive cross-sectional scanning electron microscopy (SEM) micrographs of larger ones. The evolution of thermally-grown oxide (TGO) is quantified. The TGO/bond coat interface roughness is measured in 3D. Nosignificant rumpling is observed. Undulations are found locally at the interface of the as-deposited sample. Such undulations can increase in amplitude during cycling providing locations for interfacial cracks to initiate.",

keywords = "High temperature, Turbine blade, β-(Ni, Pt)Al, Interface, Non-destructive",

author = "Xun Zhang and Yang Zhao and Philip Withers and Ping Xiao",

year = "2018",

doi = "10.1016/j.scriptamat.2018.04.010",

language = "English",

journal = "Scripta Materialia",

issn = "1359-6462",

publisher = "Elsevier BV",

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T1 - Microstructural degradation of Electron Beam-Physical Vapour Deposition Thermal Barrier Coating during thermal cycling tracked by X-ray micro-computed tomography

AU - Zhang, Xun

AU - Zhao, Yang

AU - Withers, Philip

AU - Xiao, Ping

PY - 2018

Y1 - 2018

N2 - The degradation of an Electron Beam-Physical Vapour Deposition Thermal Barrier Coating caused by thermal cycling at 1150 °C has been followed in 3D non-destructively by time-lapse X-ray micro-computed tomography (μ-CT). Quantitative analysis of X-ray μ-CT virtual cross-sections on small samples is validated by destructive cross-sectional scanning electron microscopy (SEM) micrographs of larger ones. The evolution of thermally-grown oxide (TGO) is quantified. The TGO/bond coat interface roughness is measured in 3D. Nosignificant rumpling is observed. Undulations are found locally at the interface of the as-deposited sample. Such undulations can increase in amplitude during cycling providing locations for interfacial cracks to initiate.

AB - The degradation of an Electron Beam-Physical Vapour Deposition Thermal Barrier Coating caused by thermal cycling at 1150 °C has been followed in 3D non-destructively by time-lapse X-ray micro-computed tomography (μ-CT). Quantitative analysis of X-ray μ-CT virtual cross-sections on small samples is validated by destructive cross-sectional scanning electron microscopy (SEM) micrographs of larger ones. The evolution of thermally-grown oxide (TGO) is quantified. The TGO/bond coat interface roughness is measured in 3D. Nosignificant rumpling is observed. Undulations are found locally at the interface of the as-deposited sample. Such undulations can increase in amplitude during cycling providing locations for interfacial cracks to initiate.

KW - High temperature

KW - Turbine blade

KW - β-(Ni, Pt)Al

KW - Interface

KW - Non-destructive

U2 - 10.1016/j.scriptamat.2018.04.010

DO - 10.1016/j.scriptamat.2018.04.010

M3 - Article

SN - 1359-6462

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Microstructural degradation of Electron Beam-Physical Vapour Deposition Thermal Barrier Coating during thermal cycling tracked by X-ray micro-computed tomography

Abstract

Keywords

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Structural Evolution across multiple time and length scales

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