Preparation and hot corrosion behavior of plasma sprayed nanostructured Gd 2 Zr 2 O 7 -LaPO 4 thermal barrier coatings

Guo, Liu; Li, Mingzhu; He, Sixian; Zhang, Chenglong; Wang, Qi; Ye, Fuxing

doi:10.1016/j.jallcom.2016.12.241

Cited by 33 publications

(11 citation statements)

References 45 publications

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“…Nanostructured coatings are characterized by high interlamellar strength and good crack propagation resistance. Compared with conventional APS TBCs, nanostructured coatings have lower thermal conductivity, better corrosion resistance and improved thermal cycling duration . However, in spite of the importance of nanostructured coatings, limited information is available in open literature concerning their CMAS corrosion behavior.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, nanostructured TBCs produced by APS have attracted increasing attention due to their superior performance compared with their conventional counterparts. [28][29][30][31][32] It is worthwhile to note that the expression "nanostructured thermal spraying coating" indicates the presence of nanozones embedded in the coating microstructure, rather than a coating completely exhibiting nanostructure. Nanostructured coatings are characterized by high interlamellar strength and good crack propagation resistance.…”

Section: Introductionmentioning

confidence: 99%

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Plasma sprayed nanostructured GdPO₄ thermal barrier coatings: Preparation microstructure and CMAS corrosion resistance

Guo

Cheng

et al. 2017

J Am Ceram Soc

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Nanostructured GdPO4 thermal barrier coatings (TBCs) were prepared by air plasma spraying, and their phase structure evolution and microstructure variation due to calcium–magnesium–alumina–silicate (CMAS) attack have been investigated. The chemical composition of the coating is close to that of the agglomerated particles used for thermal spraying. Nanozones with porous structure are embedded in the coating microstructure, with a percentage of ~30%. CMAS corrosion tests indicated that nanostructured GdPO4 coating is highly resistant to penetration by molten CMAS at 1250°C. Within 1 hour heat treatment duration, a continuous dense reaction layer forms on the coating surface, which are composed of P–Si apatite based on Ca2+xGd8−x(PO4)x(SiO4)6−xO2, anorthite and spinel phases. This layer provides effective prevention against CMAS further infiltration into the coating. Prolonged heat treatment densifies the reaction layer but does not change its phase composition.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Plasma sprayed nanostructured GdPO₄ thermal barrier coatings: Preparation microstructure and CMAS corrosion resistance

Guo

Cheng

et al. 2017

J Am Ceram Soc

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“…In regard to the combustion flame spray (CFS) technique has been proposed, due to the simple hardware configuration related to repair some components that they cannot be transported [14][15][16][17]. Besides the 7YSZ coatings are susceptible to corrosion at high working temperatures caused by molten salts, such as Na, S and V, contained in low-quality fuels [18][19][20][21]. Thus, two main ways have been involved to search alternative coating materials other than the stabilizers to Y 2 O 3 for ZrO 2 -based systems notably type rare-earth zirconate ceramics [22][23][24][25][26], or/and alternative techniques of ZrO 2 -based systems processing.…”

Section: Introductionmentioning

confidence: 99%

Combustion flame spray of 7YSZ powders followed by corrosion in molten salts of the coating

Mendoza

Alvarez

López

2021

Journal of Asian Ceramic Societies

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7YSZ coating was manufactured by combustion flame spray process of 7YSZ powders on MCrAlY substrate. Set parameters of combustion flame spray were used to build up an YSZ coating. Coating thickness in the range of 40-50 μm was obtained having microstructure of lamellar-splat morphology. Afterward, hot corrosion tests of the 7YSZ coating were performed in molten salts at 1050°C. Scanning electron microscopy and X-ray diffraction analysis was used to identify changes in the microstructure of the 7YSZ coating. It was identified as the main failure mechanism developed during spallation of YSZ coating.

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“…In marine environments or for the usage of low-quality fuel, TBCs face problems of molten salt attack, which caused by vanadium, sulfur, and phosphorous from fuel impurities or corrosive environments condensing the coating surfaces [10][11][12][13][14][15]. At 600-1000 • C, molten salt corrosion to YSZ TBCs is rather severe.…”

Section: Introductionmentioning

confidence: 99%

Na2SO4 + V2O5 Corrosion Behavior of BaNd2Ti3O10 for Thermal Barrier Coating Applications

She¹,

Guo²,

Tan³

et al. 2020

Coatings

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BaNd2Ti3O10 has been considered as a promising thermal barrier coating (TBC) candidate material, which reveals many advantages over the widely used TBC material of yttria partially stabilized zirconia, such as lower thermal conductivity, better high-temperature capability, and higher resistance to environmental deposits corrosion. In this study, the hot corrosion behavior of BaNd2Ti3O10 in Na2SO4 + V2O5 molten salt at 900 °C and 1000 °C is investigated. Exposed to the salt for 4 h at 900 °C, BaNd2Ti3O10 pellets had an obvious reaction with the salt, forming corrosion products of NdVO4, TiO2, and BaSO4, and the reaction layer was ~30 μm, beneath which no salt trace could be found. Prolonging the corrosion time to 20 h, the type of the corrosion products had no change. At an elevated corrosion temperature of 1000 °C for 4 h, the corrosion products were still NdVO4, TiO2, and BaSO4, but NdVO4 revealed a significant growth, which fully covered the pellet surface. The mechanisms by which the corrosion reaction between BaNd2Ti3O10 and the molten salt occurred were discussed.

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Preparation and hot corrosion behavior of plasma sprayed nanostructured Gd 2 Zr 2 O 7 -LaPO 4 thermal barrier coatings

Cited by 33 publications

References 45 publications

Plasma sprayed nanostructured GdPO₄ thermal barrier coatings: Preparation microstructure and CMAS corrosion resistance

Plasma sprayed nanostructured GdPO₄ thermal barrier coatings: Preparation microstructure and CMAS corrosion resistance

Combustion flame spray of 7YSZ powders followed by corrosion in molten salts of the coating

Na2SO4 + V2O5 Corrosion Behavior of BaNd2Ti3O10 for Thermal Barrier Coating Applications

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Preparation and hot corrosion behavior of plasma sprayed nanostructured Gd 2 Zr 2 O 7 -LaPO 4 thermal barrier coatings

Cited by 33 publications

References 45 publications

Plasma sprayed nanostructured GdPO4 thermal barrier coatings: Preparation microstructure and CMAS corrosion resistance

Plasma sprayed nanostructured GdPO4 thermal barrier coatings: Preparation microstructure and CMAS corrosion resistance

Combustion flame spray of 7YSZ powders followed by corrosion in molten salts of the coating

Na2SO4 + V2O5 Corrosion Behavior of BaNd2Ti3O10 for Thermal Barrier Coating Applications

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Plasma sprayed nanostructured GdPO₄ thermal barrier coatings: Preparation microstructure and CMAS corrosion resistance

Plasma sprayed nanostructured GdPO₄ thermal barrier coatings: Preparation microstructure and CMAS corrosion resistance