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# Study of Thermal Barrier Coatings in Water Vapor Environment using the LASDAM methodology (LAser Shock for DAmage Monitoring)

Eliott Degouilles, Vincent Guipont, Vincent Maurel, Basile Marchand

► To cite this version:

Eliott Degouilles, Vincent Guipont, Vincent Maurel, Basile Marchand. Study of Thermal Barrier Coatings in Water Vapor Environment using the LASDAM methodology (LAser Shock for DAmage Monitoring). HTCPM 2024, Jun 2024, Les Embiez, France. hal-05069688

HAL Id: hal-05069688

https://minesparis-psl.hal.science/hal-05069688v1

Submitted on 15 May 2025

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Distributed under a Creative Commons Attribution 4.0 International License
# Study of Thermal Barrier Coatings in Water Vapor Environment using the LASDAM methodology (LAser Shock for DAmage Monitoring)

Eliott DEGOUILLES, Vincent GUIPONT, Vincent MAUREL, Basile MARCHAND.

Centre des Matériaux, Mines Paris – PSL, Évry, France

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MINES PARIS

PSL

## TBC4H2 project

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* Dihydrogen can be used in gas turbine

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* Its combustion produces water vapor
$H_2 + \frac{1}{2}O_2 \rightarrow H_2O$

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* Water vapor influences damage mechanisms of high temperature components (e.g. TBCs)

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* Need to be investigated to assess the impact on lifetime

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M-ERA.NET EU-funded project driven by Łukasiewicz Research Network (PL): *Thermal Barrier Coatings for greener heat-to-power applications: understanding limits of operation under hydrogen combustion and sustainable outlook*

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* Study TBCs in a H₂O-rich environment and at high temperatures (1200°C) and compare several cutting-edge systems and processes.

Top
coat
TGO
Bond
coat
Sub-
strate

## Studied TBCs

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NiCoCrAlY

T.Gheno & Al, Alumina Failure and Post-failure Oxidation in the NiCoCrAlY Alloy System at High Temperature, 2021.

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P.Sallot & Al, Microstructure Evolution of a Platinum-Modified Nickel-Aluminide Coating During Thermal and Thermo-mechanical Fatigue, 2015

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Niama Radi, 2024

Single crystal superalloy (René N5)

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E.Degouilles, master's thesis, 2023

## LAser Shock Adhesion Test

### Example on HA188 coated Al₂O₃

X(t) diagram showing
shockwave propagation :

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Tension at the interface
Free surface reflection

Cross section observation of
a blister obtained by laser shock

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Profilometry measurement :
50% amplification

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Infrared thermography :

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* Shockwave generated with a nanosecond laser

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* Stress applied is function of laser fluency

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* Debonding occurs beyond a threshold

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* Assessment of interfacial strength

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## Post-mortem analysis

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* SEM cross-section observation

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* Blister analysis (position, dimensions, etc.)

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* Observation of other transformations (rumpling, etc.)

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* Chemical analysis with EDS : identification of infiltration and oxidation.

## High Temp. Water Vapor Exposure

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* H₂O concentration can influence TBC lifetime

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* H₂O can induce damage in/near the TGO

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* Predominant role of bondcoats

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* Potential source of hydrogen embrittlement.

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K.A. Unocic, B.A. Pint, Effect of water vapor on thermally grown alumina scales on bond coatings, 2013.

James L. Smialek & Al, Moisture-induced delamination video of an oxidized thermal barrier coating, 2008.

M. Rudolphi et al., The effect of moisture on the delayed spallation of thermal barrier coatings: VPS NiCoCrAlY bond coat + APS YSZ top coat, 2008.

## LASDAM

### Example on a TBC system from DLR with and without CMAS

1. Introduce a calibrated defect in TBC with LASAT

2. Thermo-mechanical testing (e.g. thermal cycling)

3. In-situ measurement (IRT/Profilometry)

4. Monitoring of delamination and buckling.

Sample partially infiltrated :

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CMAS infiltration
d = 8 mm

4 defects introduced :
Shock n°1,2,3 outside the infiltrated
area and the shock n°4 inside.

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Evolution of blister height

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More about CMAS on Capucine Billard's poster (283)

## Work content of the TBC4H2 project

Elaboration of cutting-edge

TBC systems by

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Fraunhofer
IWS

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Silesian University
of Technology

Avio Aero
A GE Aviation Business

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Łukasiewicz
Institut Metalurgii Żelaza

will be in charge of
analytical investigation of materials.

Thermal cycling at 1200°C in a
water vapor rich environment
at the DLR facility

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Assessment of mechanical characteristics
(interface strength, damage behavior)
with LASAT and LASDAM

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CENTRE DES MATERIAUX
P.M FOURT

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MINES PARIS

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