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Communication dans un congrès

Study of delamination induced by laser drilling of thermally sprayed TBC interfaces

Abstract : The efficiency of the aero-engines combustion chambers with thermal barrier coating (TBC) is improved when highly numerous cooling holes are laser drilled with inclined angles. However, during the laser drilling process, especially in the percussion mode, a detrimental crack can be generated at the TBC interface. Thus, each hole could be edged with a nonvisible delaminated area underneath the ceramic top-coat. The present work is focused on the thorough study of the delamination induced by laser percussion drilling when interrupted drilling conditions are achieved. Shallow angles were applied on hole each having one different and increasing number of laser pulses (from 1 to 4). Crack length was assessed by conventional metallographic preparation. A special experimental method was carried out in order to inspect the delaminated interface and the lateral edge of a semi-hole. This non-destructive assessment of the delamination of laser drilled TBC was complemented by a 3D imaging of a semi-hole using X-Ray microtomography. Results are presented paying attention on both crack initiation and propagation during the laser percussion drilling of plasmasprayed TBC.
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Communication dans un congrès
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https://hal-mines-paristech.archives-ouvertes.fr/hal-00714459
Contributeur : Bibliothèque Umr7633 <>
Soumis le : mercredi 4 juillet 2012 - 16:23:41
Dernière modification le : jeudi 24 septembre 2020 - 18:30:04

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  • HAL Id : hal-00714459, version 1

Citation

Caroline Guinard, Vincent Guipont, Henry Proudhon, Michel Jeandin, J. Girardot, et al.. Study of delamination induced by laser drilling of thermally sprayed TBC interfaces. Thermal spray 2012, May 2012, Houston, United States. pp.114-119. ⟨hal-00714459⟩

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