Heterogeneous Thermal Barrier Coatings with Engineered Gradient Interfaces

0566172 - ÚFP 2023 RIV DE eng C - Konferenční příspěvek (zahraniční konf.)
Mušálek, Radek - Tesař, Tomáš - Medřický, Jan
Heterogeneous Thermal Barrier Coatings with Engineered Gradient Interfaces.
Internation Thermal Spray Conference Proceedings. Düsseldorf: DVS Media GmbH, 2022, s. 913-918. ISBN 978-3-96144-180-8.
[International Thermal Spray Conference 2022. Vídeň (AT), 04.05.2022-06.05.2022]
Grant CEP: GA ČR(CZ) GA22-21478S
Institucionální podpora: RVO:61389021
Klíčová slova: thermal barrier * thermal spray * coatings
Obor OECD: Coating and films

Recent development of plasma spraying with liquid feedstocks enabled deposition of novel thermal barrier coatings (TBCs) with top-coats incorporating various desirable features, such as columnar microstructure or ultrafine porosi-ty. Moreover, different materials may be relatively easily combined, e.g., by alternating feedstocks in the feed line or using feedstock mixtures. Coatings with gradient change of chemistry/microstructure towards the free-surface can be also prepared by gradual change of the feedstock composition, which may be potentially beneficial for ex-ample to mitigate stresses at the macroscopic interfaces between TBC layers (typically bond-coat/top-coat or within layered top-coat). In this study, three experimental TBCs with gradient top-coats were successfully deposited by hybrid water/argon-stabilized WSP-H plasma torch, i.e., one version of coating with 8 wt.% yttria stabilized zirconia transitioning into gadolinium zirconate Gd2Zr2O7 (YSZ→GZO) and two versions of Al2O3 transitioning into YSZ (Al2O3→YSZ). Thermal cycling fatigue (TCF) test with peak temperature of 1100 °C showed outstanding thermal shock resistance of the YSZ→GZO coating and mediocre to poor resistance of both Al2O3→YSZ coatings.
Trvalý link: https://hdl.handle.net/11104/0337595