Microstructure design of the laser glazed layer on thermal barrier coatings and its effect on the CMAS corrosion

Guo, Liu; Gao, Yuan; Cheng, Yuxiang; Sun, Jingyong; Ye, Fuxing; Wang, Lu

doi:10.1016/j.corsci.2021.109847

Cited by 30 publications

(11 citation statements)

References 42 publications

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“…A smoother surface reduces contact regions between the coating and corrosive materials and increases the wetting angle of the corrosive salts on the YSZ surface, improving hot corrosion resistance. 29 When compared to APS YSZ, the surface roughness of the YSZ was reduced by approximately 35%. Except for the network cracks caused by the laser scanning, the YSZ’s surface is smooth.…”

Section: Resultsmentioning

confidence: 97%

“…Following laser surface modification, a dense coating layer of roughly 50 µm was observed on the coated surface. According to Gua et al, 29 laser glazing removed un-melted particles from the YSZ surface and gave smoother morphology. At working temperatures, the dense layer on the coated surface protects the TBC system from oxygen and other molten salts.…”

Section: Resultsmentioning

confidence: 99%

“…Laser glazing improves hot corrosion and oxidation of the resistance of the coating while retaining its heat transmission abilities. 29…”

Section: Resultsmentioning

confidence: 99%

“…Laser glazing improves hot corrosion and oxidation of the resistance of the coating while retaining its heat transmission abilities. 29 As seen in Figure 2, TBC is comprised of a metallic substrate, bond coat, and ceramic top layer. Bond coat thicknesses were measured between 70 to 75 µm, and ceramic layer thicknesses were recorded between 220 to 230 µm.…”

Section: Structural Characterizationmentioning

confidence: 99%

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Hot corrosion and CMAS degradation of laser-glazed YSZ coating with optimum parameter

Avcı,

Karabaş,

Akdoğan Eker

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part L:

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The purpose of this research is to look into the effect of laser surface modification on the hot corrosion and hot corrosion + calcium–magnesium aluminosilicate (CMAS) resistance of YSZ thermal barrier coating. Metco AMDRY 997 (Ni–22Cr–10Al–Y) powder was coated as a bond coat on the AISI 304L stainless steel substrate using a high-velocity oxy-fuel spray technique. As a ceramic top layer, 204 NS YSZ (ZrO2·8Y2O3) particles were plasma sprayed on the bond coat. Following that, the entire coating surface was treated with a 20-kHz pulsed CO2 laser to increase the coatings’ surface performance. A corrosion test was carried out in a box furnace for 20 h at 1050 °C. SEM images of laser-glazed coatings revealed denser surfaces than those of air-spraying coatings. The laser-modified coating is more resistant to hot corrosion than unmodified coatings. The X-ray diffraction analysis revealed that the reaction between yttria (Y2O3) and V2O5 resulted in the formation of YVO4 crystals as a corrosion product. According to energy dispersive spectroscopy results, laser-glazed coatings reduced molten salt diffusion from surface to bond coat. As a result, laser-glazed coatings demonstrated improved hot corrosion resistance and decreased corrosion products on the bond coat zone. After the hot corrosion test, the laser-treated composite had a 55% lower thermally grown oxide layer than untreated APS YSZ. The optimum laser parameter was used as 77.7 W laser power, 120 mm/s scanning speed, and 215 mm laser distance.

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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

“…Laser glazing improves hot corrosion and oxidation of the resistance of the coating while retaining its heat transmission abilities. 29…”

Section: Resultsmentioning

confidence: 99%

Section: Structural Characterizationmentioning

confidence: 99%

See 2 more Smart Citations

Hot corrosion and CMAS degradation of laser-glazed YSZ coating with optimum parameter

Avcı,

Karabaş,

Akdoğan Eker

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part L:

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“…Furthermore, once inside the coating, the CMAS can separate the crystals from the structure, implying a further increase in volume [21] [22] [30]. However, to infiltrate the TBC structure through pores and microcracking, CMAS must melt [31] to form silicate. However, because no wettability was observed, silicate formation probably did not occur, and thus penetration did not occur, or if it did, it was a small amount of material.…”

Section: Variation In Volumementioning

confidence: 99%

Study on the Attack of Molten Silicates on Plasma-Sprayed Thermal Barrier Coatings

Martins,

Friehe,

Silva

et al. 2023

JMMCE

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Thermal barrier coating (TBC) revolutionized the industry by allowing higher operating temperatures for equipment, such as gas turbines in the aeronautical industry. However, at high temperatures, the TBC is exposed to the attack of molten silicates, known as CMAS (Calcium-Magnesium-Alumino-Silicate), which are particles from the environment that infiltrate the TBC, causing delamination. In this study, samples coated with TBC by thermal spray and covered with CMAS were evaluated at temperatures of 1200˚C and 1250˚C. For each temperature, exposure times of 1 h and 5 h were used. Samples with longer exposure time had a considerable volume increase. The main contribution of this work was to demonstrate the non-wettability of the CMAS, even in the 5-h heat treatments, which prevented its infiltration in the deeper regions. The conditions to guarantee the formation of the silicate and its consequent wettability are also discussed.

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Trends and Perspectives in Mitigating CMAS Infiltration in Thermal Barrier Coating

Gaudin,

Despres,

Dolmaire

et al. 2023

Engineering Materials

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Microstructure design of the laser glazed layer on thermal barrier coatings and its effect on the CMAS corrosion

Cited by 30 publications

References 42 publications

Hot corrosion and CMAS degradation of laser-glazed YSZ coating with optimum parameter

Hot corrosion and CMAS degradation of laser-glazed YSZ coating with optimum parameter

Study on the Attack of Molten Silicates on Plasma-Sprayed Thermal Barrier Coatings

Trends and Perspectives in Mitigating CMAS Infiltration in Thermal Barrier Coating

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