Microstructure and Thermal Properties of the Early-Stage Experimental Thermal Barrier Coatings Deposited by Hybrid Plasma Spraying

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389021%3A_____%2F24%3A00603763" target="_blank" >RIV/61389021:_____/24:00603763 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/68407700:21340/24:00379701

Výsledek na webu

<a href="https://link.springer.com/article/10.1007/s11666-023-01708-w" target="_blank" >https://link.springer.com/article/10.1007/s11666-023-01708-w</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/s11666-023-01708-w" target="_blank" >10.1007/s11666-023-01708-w</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Microstructure and Thermal Properties of the Early-Stage Experimental Thermal Barrier Coatings Deposited by Hybrid Plasma Spraying

Popis výsledku v původním jazyce

Hybrid plasma spraying combines plasma spraying of dry coarse powders and liquids (suspensions or solutions) potentially providing high deposition rates and coatings with novel microstructures and amended functionality. Such composites may be potentially interesting also for the thermal barrier coatings (TBCs). In this study, the first experimental TBCs with hybrid ceramic top-coats were deposited by hybrid water-/argon-stabilized plasma (WSP-H) technology. Coarse dry YSZ (yttria-stabilized zirconia: ZrO2-Y2O3) powder was selected to form the top-coat matrix. Suspensions of YSZ, Al2O3 (alumina), YAG (yttrium aluminum garnet: Y3Al5O12), or GZO (gadolinium zirconate: Gd2Zr2O7) were the source of the additional miniature phase. Uniform functionalized coatings with TBC-relevant thickness and microstructure were successfully deposited. Hybrid and reference coatings deposited also with WSP-H torch and with YSZ feedstocks showed comparable thermal diffusivity regardless of the spraying conditions but the addition of Al2O3 and YAG increased it by ~ 65%, whereas GZO decreased it by ~ 20%. Thermal cycling resistance of the coatings was evaluated by thermal cycling fatigue (TCF) test. Hybrid coating with the addition of YSZ miniature phase endured on average 640 TCF cycles, which was 250-300 cycles less than the reference YSZ coatings deposited without liquid feedstocks but still comparable to the currently used YSZ-based industrial TBCs. Coatings with dissimilar chemistry of additional miniature splats showed inferior mean TCF lifetimes: GZO 438 cycles, Al2O3 272 cycles, and YAG 173 cycles, opening space for further coating optimization. All hybrid coatings failed above the bond-coat/top-coat interface. Comparison of coatings before and after the thermal exposure by scanning electron microscopy (SEM) and x-ray diffraction (XRD) revealed possible changes within the coating microstructure, namely sintering (typical for top-coat consisting only of YSZ), conversion of metastable and amorphous phase (top-coats with the addition of Al2O3 and YAG) or interaction between the matrix and secondary phase (top-coat with the addition of GZO).

Název v anglickém jazyce

Microstructure and Thermal Properties of the Early-Stage Experimental Thermal Barrier Coatings Deposited by Hybrid Plasma Spraying

Popis výsledku anglicky

Hybrid plasma spraying combines plasma spraying of dry coarse powders and liquids (suspensions or solutions) potentially providing high deposition rates and coatings with novel microstructures and amended functionality. Such composites may be potentially interesting also for the thermal barrier coatings (TBCs). In this study, the first experimental TBCs with hybrid ceramic top-coats were deposited by hybrid water-/argon-stabilized plasma (WSP-H) technology. Coarse dry YSZ (yttria-stabilized zirconia: ZrO2-Y2O3) powder was selected to form the top-coat matrix. Suspensions of YSZ, Al2O3 (alumina), YAG (yttrium aluminum garnet: Y3Al5O12), or GZO (gadolinium zirconate: Gd2Zr2O7) were the source of the additional miniature phase. Uniform functionalized coatings with TBC-relevant thickness and microstructure were successfully deposited. Hybrid and reference coatings deposited also with WSP-H torch and with YSZ feedstocks showed comparable thermal diffusivity regardless of the spraying conditions but the addition of Al2O3 and YAG increased it by ~ 65%, whereas GZO decreased it by ~ 20%. Thermal cycling resistance of the coatings was evaluated by thermal cycling fatigue (TCF) test. Hybrid coating with the addition of YSZ miniature phase endured on average 640 TCF cycles, which was 250-300 cycles less than the reference YSZ coatings deposited without liquid feedstocks but still comparable to the currently used YSZ-based industrial TBCs. Coatings with dissimilar chemistry of additional miniature splats showed inferior mean TCF lifetimes: GZO 438 cycles, Al2O3 272 cycles, and YAG 173 cycles, opening space for further coating optimization. All hybrid coatings failed above the bond-coat/top-coat interface. Comparison of coatings before and after the thermal exposure by scanning electron microscopy (SEM) and x-ray diffraction (XRD) revealed possible changes within the coating microstructure, namely sintering (typical for top-coat consisting only of YSZ), conversion of metastable and amorphous phase (top-coats with the addition of Al2O3 and YAG) or interaction between the matrix and secondary phase (top-coat with the addition of GZO).

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

20506 - Coating and films

Projekt

<a href="/cs/project/GA22-21478S" target="_blank" >GA22-21478S: Vysokoentalpická depozice hybridních plazmových nástřiků</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2024

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Journal of Thermal Spray Technology

ISSN

1059-9630

e-ISSN

1544-1016

Svazek periodika

33

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

14

Strana od-do

732-745

Kód UT WoS článku

001142083000001

EID výsledku v databázi Scopus

2-s2.0-85182171922