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| Hauptseite > Publikationsdatenbank > Functional performance of Gd 2 Zr 2 O 7 /YSZ multi-layered thermal barrier coatings deposited by suspension plasma spray > print |
| Hauptseite > Publikationsdatenbank > Functional performance of Gd 2 Zr 2 O 7 /YSZ multi-layered thermal barrier coatings deposited by suspension plasma spray > print |
| 001 | 838245 | ||
| 005 | 20240711085618.0 | ||
| 024 | 7 | _ | |a 10.1016/j.surfcoat.2016.12.062 |2 doi |
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| 100 | 1 | _ | |a Mahade, Satyapal |0 P:(DE-Juel1)169700 |b 0 |e Corresponding author |
| 245 | _ | _ | |a Functional performance of Gd 2 Zr 2 O 7 /YSZ multi-layered thermal barrier coatings deposited by suspension plasma spray |
| 260 | _ | _ | |a Amsterdam [u.a.] |c 2017 |b Elsevier Science |
| 336 | 7 | _ | |a article |2 DRIVER |
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| 520 | _ | _ | |a 7–8 wt.% yttria stabilized zirconia (YSZ) is the standard ceramic top coat material used in gas turbines to insulate the underlying metallic substrate. However, at higher temperatures (> 1200 °C), phase stability and sintering becomes an issue for YSZ. At these temperatures, YSZ is also susceptible to CMAS (calcium magnesium alumino silicates) infiltration. New ceramic materials such as pyrochlores have thus been proposed due to their excellent properties such as lower thermal conductivity and better CMAS attack resistance compared to YSZ. However, pyrochlores have inferior thermo mechanical properties compared to YSZ. Therefore, double-layered TBCs with YSZ as the intermediate layer and pyrochlore as the top ceramic layer have been proposed. In this study, double layer TBC comprising gadolinium zirconate (GZ)/YSZ and triple layer TBC (GZdense/GZ/YSZ) comprising relatively denser GZ top layer on GZ/YSZ were deposited by suspension plasma spray. Also, single layer 8YSZ TBC was suspension plasma sprayed to compare its functional performance with the multi-layered TBCs. Cross sections and top surface morphology of as sprayed TBCs were analyzed by scanning electron microscopy (SEM). XRD analysis was done to identify phases formed in the top surface of as sprayed TBCs. Porosity measurements were made using water intrusion and image analysis methods. Thermal diffusivity of the as sprayed TBCs was measured using laser flash analysis and thermal conductivity of the TBCs was calculated. The multi-layered GZ/YSZ TBCs were shown to have lower thermal conductivity than the single layer YSZ. The as sprayed TBCs were also subjected to thermal cyclic testing at 1300 °C. The double and triple layer TBCs had a longer thermal cyclic life compared to YSZ. The thermo cycled samples were analyzed by SEM. |
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