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001007221 1001_ $$0P:(DE-Juel1)186718$$aHeyl, Hanna$$b0$$eCorresponding author$$ufzj
001007221 245__ $$aEffects of laser-structured and APS flash-coated CoNiCrAlY bondcoats on the furnace cycle lifetime of double-layered Y2O3-stabilized ZrO2/MgAl2O4 abradable coatings
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001007221 520__ $$aImproving the mechanical interlocking within the layers of an abradable and a thermal barrier coating (TBC) plays a key role in extending its lifetime. This can be achieved by increasing the surface profile of the bondcoat using laser ablation and flash coating. To this end, this work analyzes the impact of laser-ablated and atmospherically plasma-sprayed flash-coated CoNiCrAlY bondcoats on the furnace cycle lifetime of double-layered Y2O3-stabilized ZrO2/MgAl2O4 abradable coatings. The three different bondcoat modifications studied in this work are, namely, a laser-ablated vacuum plasma sprayed bondcoat with a square-shaped grid surface structure, a laser-ablated vacuum plasma sprayed bondcoat with an additional atmospheric plasma sprayed fine flash-coat for increased micro-roughness, and a standard vacuum plasma sprayed bondcoat with a coarse and a subsequent fine atmospherically plasma sprayed flash-coat. As a reference sample, a standard vacuum plasma sprayed bondcoat is used. A detailed analysis of the optimal laser parameters to manufacture homogenous laser-structured bondcoats is presented, while furnace cycle tests at 1100 °C are used to identify the performance of the different bondcoat/ceramic topcoat systems. The obtained results show that the cycling lifetime improved for all three modified bondcoats compared to the standard bondcoat. However, the two laser-structured bondcoats present the most significant increase by almost three times. X-ray diffraction and scanning electron microscope results further reveal that the laser ablation process has no considerable effect on the material composition. Furthermore, roughness measurements highlight that the bondcoat's macro-roughness has a more pronounced effect on the cycling life than its micro-roughness. The furnace cycle tests, moreover, show that both laser-structured bondcoats have different failure modes, but similar cycling lifetime.
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001007221 7001_ $$0P:(DE-Juel1)129630$$aMack, Daniel Emil$$b1$$ufzj
001007221 7001_ $$0P:(DE-Juel1)167449$$aTandler, Martin$$b2$$ufzj
001007221 7001_ $$0P:(DE-HGF)0$$aSchrüfer, Susanne$$b3
001007221 7001_ $$0P:(DE-Juel1)129670$$aVaßen, Robert$$b4$$ufzj
001007221 773__ $$0PERI:(DE-600)1502240-7$$a10.1016/j.surfcoat.2023.129513$$gVol. 464, p. 129513 -$$p129513 -$$tSurface and coatings technology$$v464$$x0257-8972$$y2023
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001007221 8564_ $$uhttps://juser.fz-juelich.de/record/1007221/files/Manuscript_Heyl.pdf$$yPublished on 2023-04-19. Available in OpenAccess from 2025-04-19.
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