Hot corrosion of Gd2Zr2O7, Gd2Zr2O7/YbSZ, YSZ + Gd2Zr2O7/YbSZ, and YSZ thermal barrier coatings exposed to Na2SO4 + V2O5

Tabeshfar, Mohadese; Salehi, Mehdi; Dini, Ghasem; Dahl, Paul Inge; Einarsrud, Mari‐Ann; Wiik, Kjell

doi:10.1016/j.surfcoat.2020.126718

Cited by 10 publications

(2 citation statements)

References 38 publications

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“…In addition, the mechanical property test shows that the fracture toughness and hardness of the formed reaction layer are comparable to the Gd 2 Zr 2 O 7 coating. The turbine blades rotate at high speeds during operation, and the high hardness of the reaction layer contributes to better resistance to erosion and friction caused by sediments in the high-temperature gas path [76]. The fracture toughness is an important parameter for measuring crack propagation ability.…”

Section: Cmas-fe Corrosion Under Growth Of Reaction Layersmentioning

confidence: 99%

Corrosion behavior of Gd ₂Zr ₂O ₇ thermal barrier coatings under Fe-containing environmental sediment attack

Guo,

Li,

Yan

2024

Journal of Advanced Ceramics

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Environmental sediments mainly consisting of CaO-MgO-Al 2 O 3 -SiO 2 (CMAS) corrosion are a serious threat to thermal barrier coatings (TBCs), in which Fe element is usually ignored. Gd 2 Zr 2 O 7 TBCs are famous for their excellent CMAS resistance. In this study, the characteristics of Fe-containing environmental sediments (CMAS-Fe) and their corrosiveness to Gd 2 Zr 2 O 7 coatings were investigated. Four types of CMAS-Fe glass with different Fe contents were fabricated. Their melting points were measured to be 1322-1344 ℃, and the high-temperature viscosity showed a decreasing trend with increasing Fe contents. The corrosion behavior of four types of CMAS-Fe to Gd 2 Zr 2 O 7 coatings at 1350 ℃ was investigated. At the initial corrosion stage (0.1 h), anorthite was precipitated in CMAS-Fe with a high Ca : Si ratio, while Fe-garnet was formed in the melt with the highest Fe content. Prolonging the corrosion time resulted in the formation of a reaction layer, which exhibited an interpenetrating network composed of Gd-oxyapatite, ZrO 2 , and residual CMAS-Fe. Some spinel was precipitated within the reaction layer. After 1 h or even longer time, the reaction layers tended to be stable and compact, which had comparable hardness and fracture toughness to those of Gd 2 Zr 2 O 7 coatings. Under the cyclic CMAS-Fe attack, the residual CMAS-Fe in the interpenetrating network provided a pathway for the redeposited CMAS-Fe infiltration, resulting in the continuous growth of the reaction layer. As a result, the Gd 2 Zr 2 O 7 coatings had a large consumption in the thickness, degrading the coating performance. Therefore, the Gd 2 Zr 2 O 7 coatings exhibit unsatisfactory corrosion resistance to CMAS-Fe attack.

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Section: Cmas-fe Corrosion Under Growth Of Reaction Layersmentioning

confidence: 99%

Corrosion behavior of Gd ₂Zr ₂O ₇ thermal barrier coatings under Fe-containing environmental sediment attack

Guo,

Li,

Yan

2024

Journal of Advanced Ceramics

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“…Chemical reactions can increase the failure speed of TBCs. When the environmental temperature is around 900 • C, molten salts (V 2 O 5 , Na 2 SO 4 and NaCl) in the air can influence the lifetime of TBCs [37]. Molten salts were spun on the surface of the top ceramics and then maintained at 900 • C for 4 h. The corresponding elemental mapping results for the YYG coating with an ultrathin dense layer after hot corrosion tests in V 2 O 5 -Na 2 SO 4 -NaCl molten salts at 900 • C for 4 h are shown in Figure 7.…”

Section: Corrosion Analysismentioning

confidence: 99%

Effects of Top Ceramic Layers with an Ultrathin Dense Layer on the Thermal–Physical Properties of Thermal Barrier Coatings

Ai,

Wang,

Yang

et al. 2023

Coatings

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Thermal barrier coatings have been used to protect superalloys under extremely harsh conditions. The durability of TBCs with a NiCoCrAlY bond layer prepared via the air plasma spray process and an ultrathin dense layer prepared via magnetron sputtering was investigated under different corrosion conditions. This paper discusses the corrosion resistance improvement mechanism of TBCs with a dense layer produced by magnetron sputtering under corrosion conditions with environmental contaminants such as calcium–magnesium–aluminum–silicon oxide systems (CMAS) at 1300 °C and NaCl-Na2SO4-V2O5 (NV) at 900 °C. The corrosion results show that CMAS will react with the stabilizers of zirconium oxide, which will change the rate of the phase transition, as determined via X-ray diffraction tests. A thermal ablation test verified that TBCs with a dense layer have a better corrosion resistance and better thermal insulation properties. All results show that preparing TBCs with a dense layer via the magnetron sputtering method will be an efficient method to improve TBCs’ properties at high temperatures in the future.

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Oxidation Behavior of Single-Layer Gd2Zr2O7, and Gd2Zr2O7/YbSZ, and Double-Layer YSZ + Gd2Zr2O7/YbSZ Thermal Barrier Coatings

Tabeshfar

Dini

Salehi

et al. 2023

High Temperature Corrosion of mater.

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Hot corrosion of Gd2Zr2O7, Gd2Zr2O7/YbSZ, YSZ + Gd2Zr2O7/YbSZ, and YSZ thermal barrier coatings exposed to Na2SO4 + V2O5

Cited by 10 publications

References 38 publications

Corrosion behavior of Gd ₂Zr ₂O ₇ thermal barrier coatings under Fe-containing environmental sediment attack

Corrosion behavior of Gd ₂Zr ₂O ₇ thermal barrier coatings under Fe-containing environmental sediment attack

Effects of Top Ceramic Layers with an Ultrathin Dense Layer on the Thermal–Physical Properties of Thermal Barrier Coatings

Oxidation Behavior of Single-Layer Gd2Zr2O7, and Gd2Zr2O7/YbSZ, and Double-Layer YSZ + Gd2Zr2O7/YbSZ Thermal Barrier Coatings

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Hot corrosion of Gd2Zr2O7, Gd2Zr2O7/YbSZ, YSZ + Gd2Zr2O7/YbSZ, and YSZ thermal barrier coatings exposed to Na2SO4 + V2O5

Cited by 10 publications

References 38 publications

Corrosion behavior of Gd 2Zr 2O 7 thermal barrier coatings under Fe-containing environmental sediment attack

Corrosion behavior of Gd 2Zr 2O 7 thermal barrier coatings under Fe-containing environmental sediment attack

Effects of Top Ceramic Layers with an Ultrathin Dense Layer on the Thermal–Physical Properties of Thermal Barrier Coatings

Oxidation Behavior of Single-Layer Gd2Zr2O7, and Gd2Zr2O7/YbSZ, and Double-Layer YSZ + Gd2Zr2O7/YbSZ Thermal Barrier Coatings

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Hot corrosion of Gd2Zr2O7, Gd2Zr2O7/YbSZ, YSZ + Gd2Zr2O7/YbSZ, and YSZ thermal barrier coatings exposed to Na2SO4 + V2O5

Corrosion behavior of Gd ₂Zr ₂O ₇ thermal barrier coatings under Fe-containing environmental sediment attack

Corrosion behavior of Gd ₂Zr ₂O ₇ thermal barrier coatings under Fe-containing environmental sediment attack