Tracking the Calcium Magnesium-Alumino-Silicate (CMAS) Infiltration into an Air-Plasma Spray Thermal Barrier Coating using X-ray Imaging

Xun Zhang; Xiao Shan; Philip Withers; Xiaofeng Zhao; Ping Xiao

doi:10.1016/j.scriptamat.2019.09.016

Tracking the Calcium Magnesium-Alumino-Silicate (CMAS) Infiltration into an Air-Plasma Spray Thermal Barrier Coating using X-ray Imaging

Xun Zhang, Xiao Shan, Philip Withers, Xiaofeng Zhao, Ping Xiao

Materials Engineering

Shanghai Jiao Tong University

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

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Abstract

The progressive infiltration of a free-standing air plasma spray (APS) thermal barrier coating (TBC) by calcium-magnesium-alumino-silicate (CMAS) at 1250°C is followed non-destructively by time-lapse X-ray micro-computed tomography (µ-CT). The top ∼50 µm of the TBC expands rapidly (within the first 20 min) by as much as 70% due to the physical ingress of the CMAS along the splat boundaries and becomes exfoliated. The ingress and resulting exfoliation are shown to be driven by capillary forces with the exfoliated depth dependent on the CMAS loading. The remainder of the TBC swells at a slower rate (ultimately by 15%) but remains intact.

Original language	English
Pages (from-to)	94-98
Number of pages	5
Journal	Scripta Materialia
Volume	176
Early online date	10 Oct 2019
DOIs	https://doi.org/10.1016/j.scriptamat.2019.09.016
Publication status	Published - 1 Feb 2020

Keywords

Aero engine
Correlative microscopy
Failure
High temperature
Volcanic ash

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10.1016/j.scriptamat.2019.09.016

SMM-19-1461R1 (1)Accepted author manuscript, 18.8 MB

Tomographic Imaging CCPi
Withers, P. (PI), Lee, P. (CoI) & Lionheart, W. (CoI)
29/08/15 → 28/08/20
Project: Research
Next Generation Multi-Dimensional X-ray Imaging
Withers, P. (PI), Burke, G. (CoI), Cernik, R. (CoI), Haigh, S. (CoI), Lee, P. (CoI) & Lionheart, W. (CoI)
1/02/15 → 31/01/20
Project: Research
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

Cite this

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title = "Tracking the Calcium Magnesium-Alumino-Silicate (CMAS) Infiltration into an Air-Plasma Spray Thermal Barrier Coating using X-ray Imaging",

abstract = "The progressive infiltration of a free-standing air plasma spray (APS) thermal barrier coating (TBC) by calcium-magnesium-alumino-silicate (CMAS) at 1250°C is followed non-destructively by time-lapse X-ray micro-computed tomography (µ-CT). The top ∼50 µm of the TBC expands rapidly (within the first 20 min) by as much as 70% due to the physical ingress of the CMAS along the splat boundaries and becomes exfoliated. The ingress and resulting exfoliation are shown to be driven by capillary forces with the exfoliated depth dependent on the CMAS loading. The remainder of the TBC swells at a slower rate (ultimately by 15%) but remains intact.",

keywords = "Aero engine, Correlative microscopy, Failure, High temperature, Volcanic ash",

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

year = "2020",

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day = "1",

doi = "10.1016/j.scriptamat.2019.09.016",

language = "English",

volume = "176",

pages = "94--98",

journal = "Scripta Materialia",

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T1 - Tracking the Calcium Magnesium-Alumino-Silicate (CMAS) Infiltration into an Air-Plasma Spray Thermal Barrier Coating using X-ray Imaging

AU - Zhang, Xun

AU - Shan, Xiao

AU - Withers, Philip

AU - Zhao, Xiaofeng

AU - Xiao, Ping

PY - 2020/2/1

Y1 - 2020/2/1

N2 - The progressive infiltration of a free-standing air plasma spray (APS) thermal barrier coating (TBC) by calcium-magnesium-alumino-silicate (CMAS) at 1250°C is followed non-destructively by time-lapse X-ray micro-computed tomography (µ-CT). The top ∼50 µm of the TBC expands rapidly (within the first 20 min) by as much as 70% due to the physical ingress of the CMAS along the splat boundaries and becomes exfoliated. The ingress and resulting exfoliation are shown to be driven by capillary forces with the exfoliated depth dependent on the CMAS loading. The remainder of the TBC swells at a slower rate (ultimately by 15%) but remains intact.

AB - The progressive infiltration of a free-standing air plasma spray (APS) thermal barrier coating (TBC) by calcium-magnesium-alumino-silicate (CMAS) at 1250°C is followed non-destructively by time-lapse X-ray micro-computed tomography (µ-CT). The top ∼50 µm of the TBC expands rapidly (within the first 20 min) by as much as 70% due to the physical ingress of the CMAS along the splat boundaries and becomes exfoliated. The ingress and resulting exfoliation are shown to be driven by capillary forces with the exfoliated depth dependent on the CMAS loading. The remainder of the TBC swells at a slower rate (ultimately by 15%) but remains intact.

KW - Aero engine

KW - Correlative microscopy

KW - Failure

KW - High temperature

KW - Volcanic ash

U2 - 10.1016/j.scriptamat.2019.09.016

DO - 10.1016/j.scriptamat.2019.09.016

M3 - Article

SN - 1359-6462

VL - 176

SP - 94

EP - 98

JO - Scripta Materialia

JF - Scripta Materialia

ER -

Tracking the Calcium Magnesium-Alumino-Silicate (CMAS) Infiltration into an Air-Plasma Spray Thermal Barrier Coating using X-ray Imaging

Abstract

Keywords

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Projects

Tomographic Imaging CCPi

Next Generation Multi-Dimensional X-ray Imaging

Structural Evolution across multiple time and length scales

Cite this