Microstructure, mechanical and thermal properties of YSZ thermal barrier coatings deposited by axial suspension plasma spraying

• Autorzy: Poliarus Olena , Morgiel Jerzy , Żórawski Wojciech , Góral Anna , Pomorska Małgorzata , Wojciechowski Krzysztof T. , Cherniushok Oleksandr

Identyfikatory

DOI

10.1007/s43452-023-00616-8

• Języki publikacji: EN

Abstrakty

EN

Yttrium-stabilized zirconia (YSZ) thermal barrier coatings (TBCs) are indispensable elements of present-day turbine propulsion systems. The ones deposited with atmospheric plasma spraying (APS) are characterized by required low thermal conductivity, but they are unable to survive frequent thermomechanical loading and therefore their application is limited to parts remaining stationary. Expanding capability of TBCs is sought in various areas, but the one realized through modification of most proliferated apparatus used for plasma spraying (PS) (from radial to axial injection) and substituting micrometric powders with the nano-structured suspension needs least changes in the industry established procedures and offers the highest property improvement. The present experiment covered the deposition of ZrO_2-8Y₂O₃ YSZ TBC using both atmospheric and suspension PS processes. They were performed with commercial micrometric and nano-structured YSZ (8% Y₂O₃) powders. The coatings morphology and microstructure were characterized with 3D profilometry, scanning and transmission electron microscopy (SEM/TEM) methods. Finally, the coating’s hardness and heat conductivity were measured. This complex approach allowed to state that PS of micrometric t’-ZrO₂ powder having an admixture of m-ZrO₂ phase is capable of only partial improvement in its homogenization. However, the suspension PS process of nano-structured powder eliminated any traces of the monoclinic phase from the coating. The TEM microstructure observations indicated that the suspension PS coating is built by in-flight solidified droplets as well as by the melted ones flattened on arrival. A surface layer of liquefied material on solid droplets increases their adhesion to surface asperities promoting pseudo-columnar growth of the coating. The preservation of monotonic slow increase of thermal conductivity during heating of the suspension PS coating means, that its pseudo-columnar microstructure is better suited to withstand high strains during such treatment.

Słowa kluczowe

EN

yttrium stabilized zirconia; YSZ; suspension plasma spraying; SPS; atmospheric plasma spraying; APS; thermal barrier coatings; TBC

PL

tlenek cyrkonu stabilizowany itrem; YSZ; natryskiwanie plazmowe zawiesin; SPS; natryskiwanie plazmowe atmosferyczne; APS; powłokowa bariera cieplna; TBC

• Wydawca: Springer ; Wrocław University of Science and Technology
• Czasopismo: Archives of Civil and Mechanical Engineering
• Rocznik: 2023
• Tom: Vol. 23, no. 2
• Strony: art. no., e89, 2023
• Opis fizyczny: Bibliogr. 26 poz., rys., tab., wykr.

Twórcy

autor

Poliarus Olena

• Frantsevich Institute for Problems of Materials Science, National Academy of Sciences of Ukraine (NASU), Krzhizhanovsky str, Kyiv 03142, Ukraine

• https://orcid.org/0000-0003-3181-419X

autor

Morgiel Jerzy

• Institute of Metallurgy and Materials Science, Polish Academy of Sciences (PAS), 25 Reymonta St, 30‑059 Krakow, Poland

autor

Żórawski Wojciech

• Laser Processing Research Centre, Kielce University of Technology, 7 Tysiąclecia Państwa Polskiego Av, 25‑314 Kielce, Poland

autor

Góral Anna

• Institute of Metallurgy and Materials Science, Polish Academy of Sciences (PAS), 25 Reymonta St, 30‑059 Krakow, Poland

autor

Pomorska Małgorzata

• Institute of Metallurgy and Materials Science, Polish Academy of Sciences (PAS), 25 Reymonta St, 30‑059 Krakow, Poland

autor

Wojciechowski Krzysztof T.

• Department of Inorganic Chemistry, Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Mickiewicza Ave. 30, 30‑059 Krakow, Poland

autor

Cherniushok Oleksandr

• Department of Inorganic Chemistry, Faculty of Materials Science and Ceramics, AGH University of Science and Technology, Mickiewicza Ave. 30, 30‑059 Krakow, Poland

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