Abstract
Surface laser texturing is used to ensure mechanical anchoring and strengthen adhesion between the interfaces of bond coatless thermal barrier coating system. To anticipate a possible loss of mechanical properties and to adapt to the perpetual evolutions of chemical compositions of the system, we analyzed the microstructural evolutions of different Ni-based single crystal superalloys, induced during infrared nanosecond laser ablation. Localized asperities composed of a melted, re-solidified matter, with a different microstructure from that of the bulk material, were generated. Regarding asperity morphologies, recrystallization within the latter could be avoided. Then, to compare different Ni-base single crystal superalloys, the thermal-affected volumes were characterized for two patterns textured under different energetic conditions. It seems that all the studied single crystal superalloys behaved quite similarly during nanosecond laser ablation. Finally, according to these results, ablation kinetics between the γ and γ′ phases of Ni-based superalloys could not be homogeneous.
Highlights
To meet environmental challenges, it is necessary to reduce fuel usage and NOx and CO/CO2 emissions of aero-engines
A thermal barrier coating system is usually composed of three different layers, a bond coat, a natural oxide layer called TGO (Thermally Grown Oxide) and a ceramic top coat, deposited onto a nickel-based single crystal superalloy
Infrared nanosecond laser ablation promotes the formation of asperities composed of The following points summarize the content of this work: melted, re-solidified matter around cavities
Summary
It is necessary to reduce fuel usage and NOx and CO/CO2 emissions of aero-engines. The critical damage mechanisms of the TBC system are mainly related to the coupled evolution of the TGO and the bond coat [7]. These evolutions are due to the growth of the TGO by oxidation [8], and the deformation of TGO/bond coat interface by ratcheting [7] or rumpling [9], in order to relax the accumulated stresses [7,10,11,12,13,14,15,16]
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