Effects of Thermal Exposure on Microstructure of Thermal Barriers Deposited by Hybrid Plasma Spraying

0581976 - ÚFP 2024 RIV CA eng C - Conference Paper (international conference)
Mušálek, Radek - Tesař, Tomáš - Medřický, Jan - Lukáč, František - Dudík, Jonáš
Effects of Thermal Exposure on Microstructure of Thermal Barriers Deposited by Hybrid Plasma Spraying.
Thermal Spray 2023: Proceedings from the International Thermal Spray Conference. Québec City: ASM International, 2023, s. 422-427. ISBN 978-1-62708-453-6.
[International Thermal Spray Conference. Quebec City (CA), 22.05.2023-25.05.2023]
Institutional support: RVO:61389021
Keywords : hybrid plasma spraying * thermal barrier * microstructure
OECD category: Materials engineering
https://dl.asminternational.org/itsc/proceedings-abstract/ITSC2023/84536/422/26340

Hybrid plasma spraying combines plasma spraying of dry powders and liquids (suspensions and solutions). Combination of these two approaches allows deposition of microstructures consisting of both conventional coarse and ultrafine splats. Moreover, splats with dissimilar size may have also different chemistry. Such combination is potentially interesting for many fields of thermal spraying, including thermal barrier coatings (TBCs), as novel microstructures may be economically and relatively easily obtained. The technology has recently reached a level, where coatings with interesting hybrid microstructures may be reliably deposited, so that their potential for practical applications may be evaluated. In this study, first experimental TBCs with YSZ-based hybrid topcoat were deposited by hybrid water/argon stabilized plasma (WSP-H) technology. Al2O3 and YAG were selected as secondary phase deposited from suspension as both provide strong materials contrast in scanning electron microscope (SEM) so they can be used as “markers” in the coating microstructure. Samples were exposed to thermal cycling simulating in-service TBC conditions in order to test their thermal shock resistance. Changes of the coating microstructure were studied by SEM analysis and X-ray diffraction.
Permanent Link: https://hdl.handle.net/11104/0350112