This title appears in the Scientific Report :
2023
Please use the identifier:
http://hdl.handle.net/2128/34395 in citations.
Please use the identifier: http://dx.doi.org/10.1016/j.surfcoat.2023.129513 in citations.
Effects of laser-structured and APS flash-coated CoNiCrAlY bondcoats on the furnace cycle lifetime of double-layered Y2O3-stabilized ZrO2/MgAl2O4 abradable coatings
Effects of laser-structured and APS flash-coated CoNiCrAlY bondcoats on the furnace cycle lifetime of double-layered Y2O3-stabilized ZrO2/MgAl2O4 abradable coatings
Improving 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 i...
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Personal Name(s): | Heyl, Hanna (Corresponding author) |
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Mack, Daniel Emil / Tandler, Martin / Schrüfer, Susanne / Vaßen, Robert | |
Contributing Institute: |
Werkstoffsynthese und Herstellungsverfahren; IEK-1 |
Published in: | Surface and coatings technology, 464 (2023) S. 129513 - |
Imprint: |
Amsterdam [u.a.]
Elsevier Science
2023
|
DOI: |
10.1016/j.surfcoat.2023.129513 |
Document Type: |
Journal Article |
Research Program: |
Gas turbines |
Link: |
Get full text Published on 2023-04-19. Available in OpenAccess from 2025-04-19. |
Publikationsportal JuSER |
Please use the identifier: http://dx.doi.org/10.1016/j.surfcoat.2023.129513 in citations.
Improving 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. |