scholarly journals Calibration of Raman Spectroscopy in the Stress Measurement of Air-Plasma-Sprayed Yttria-Stabilized Zirconia

2012 ◽  
Vol 66 (10) ◽  
pp. 1204-1209 ◽  
Author(s):  
Dong Liu ◽  
Oliver Lord ◽  
Peter E.J. Flewitt
Keyword(s):  
Raman Spectroscopy ◽  
Stress Measurement ◽  
Yttria Stabilized Zirconia ◽  
Air Plasma ◽  
Stabilized Zirconia ◽  
Plasma Sprayed

scholarly journals Effects of Selective Laser Modification and Al Deposition on the Hot Corrosion Resistance of Ceria and Yttria-Stabilized Zirconia Thermal Barrier Coatings

Coatings ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 353 ◽  
Author(s):  
Panpan Zhang ◽  
Xiaofeng Zhang ◽  
Fuhai Li ◽  
Zhihui Zhang ◽  
Hong Li ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Hot Corrosion ◽  
Molten Salts ◽  
Yttria Stabilized Zirconia ◽  
Air Plasma ◽  
Laser Remelting ◽  
Stabilized Zirconia ◽  
Α Al2o3 ◽  
Sprayed Coating ◽  
Plasma Sprayed

The air-plasma-sprayed ceria and yttria-stabilized zirconia (CYSZ) coating was modified by selective laser remelting and Al deposition to enhance hot corrosion resistance. The dotted coating was obtained after selective laser remelting. Magnetron sputtering was used to deposit an Al film on the dotted coating, and a vacuum heat treatment was subsequently performed to produce a dense α-Al2O3 overlay. Hot corrosion behavior of the following three types of coatings was investigated: plasma-sprayed, dotted, and dotted coatings combined with Al deposition (DA). Hot corrosion behaviors were evaluated in a mixture of 55 wt % V2O5 and 45 wt % Na2SO4 molten salts at 1000 °C for 30 h. The hot corrosion reaction between molten salts and zirconia stabilizers (Y2O3 and CeO2) led to the generation of monoclinic zirconia, YVO4, and CeVO4 plate-shaped crystals, and the mineralization of CeO2. The results indicated that the hot corrosion resistance of the DA coating was the best, and the dotted coating had superior hot corrosion resistance in comparison with the plasma-sprayed coating. The minimal surface roughness and dense dotted units improved the hot corrosion resistance of the dotted coating. The dense α-Al2O3 overlay with chemical inertness effectively inhibited the infiltration of molten salts, which led to the optimal hot corrosion resistance of the DA coating.

Effect of Second Phase Particles on Solid Particles Erosion of Air Plasma Sprayed Yttria Stabilized Zirconia

2021 ◽  
Vol 875 ◽  
pp. 302-314
Author(s):  
Noveed Ejaz ◽  
Liaqat Ali ◽  
Muhammad Mansoor
Keyword(s):  
Mechanical Response ◽  
Ceramic Materials ◽  
Solid Particles ◽  
Yttria Stabilized Zirconia ◽  
Second Phase ◽  
Air Plasma ◽  
Ambient Conditions ◽  
Stabilized Zirconia ◽  
Phase Component ◽  
Plasma Sprayed

Yttria stabilized zirconia (YSZ) based composite topcoats were prepared with three advanced ceramic materials as second phase component; CaZrO3, (La0.75Nd0.25)2Zr2O7 and Nd2Ce2O7. The solid particles erosion (SPE) testing of the air plasma sprayed composite topcoats was carried out at room temperature and 900 °C to study the effects of second phase on erosion behavior. The erodent was angular fused alumina of 40-45 mm size. The erosion mechanism was followed in all topcoats with cracking and fracturing of the plasma sprayed splats due to erodent particles impact and impingement, whereas micro-ploughing was observed after 900 °C SPE testing as an additional feature. The hardness and intrinsic properties of second phase component in the composite topcoats played a crucial role in improving the erosion rate (ER) at ambient as well as 900 °C. The Nd2Ce2O7/YSZ topcoat show lower ER due to combatively higher hardness of Nd2Ce2O7 and good interfacial bonding with YSZ. The overall lowering of ER at 900 °C as compared to that of at ambient conditions was ascribed to the anelastic mechanical response of the ceramic topcoats due to thermal cycling involved in the SPE testing at high temperature.

Low Temperature Transformation of 3 mol% Yttria Stabilized Zirconia Coatings Deposited by Air Plasma Spraying

2009 ◽  
Vol 620-622 ◽  
pp. 413-416
Author(s):  
Bo Liang ◽  
Huang Chen ◽  
Chuan Xian Ding
Keyword(s):  
Raman Spectroscopy ◽  
Low Temperature ◽  
Water Temperature ◽  
Plasma Spraying ◽  
Deposition Efficiency ◽  
Yttria Stabilized Zirconia ◽  
Air Plasma ◽  
Air Plasma Spraying ◽  
Stabilized Zirconia ◽  
Temperature Transformation

The low temperature transformation of ZrO2-3 mol% Y2O3 coatings were investigated at 40 ~100oC using Raman spectroscopy. The results show that the low temperature transformation of ZrO2-3 mol% Y2O3 coatings is considerably effected by water temperature and mainly occurred on the coating surface. However, the transformation can be retarded by addition of Al2O3. The reasons lie in that the addition of Al2O3 can result in improvement of deposition efficiency and Young’s modulus of ZrO2-3 mol% Y2O3 coatings containing Al2O3.

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