Interactions between rare-earth zirconates (RE2Zr2O7) and CMAS silicate melts

Wu, Yang; Zhi, Wenbo; Li, Yu; Guo, Xingye; Zhou, Zheng; Shao, Wei; He, Dingyong

doi:10.1016/j.corsci.2023.111526

Cited by 11 publications

(1 citation statement)

References 51 publications

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“…The ability of TBC materials to effectively resist CMAS relies on the rapid crystalline interaction with the CMAS melt, which is contingent upon the chemical composition of the local melt. Some studies found that the presence of Fe exerts an influence on the formation of both Fegarnet phase and spinel, consequently impacting the formation of a compact crystalline layer [37,38]. Mechnich and Brace [33] also found an unreported Gd,Fe-zirconolite recession product (Gd 0.95 Zr 1.15 Fe 0.8 Ti 0.9 Al 0.2 O 7 ) in the volcanic ash-induced decomposition of Gd 2 Zr 2 O 7 .…”

Section: Introductionmentioning

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: Introductionmentioning

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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Multilayer GZ/YSZ thermal barrier coating from suspension and solution precursor plasma spray

Leng,

Romero,

Curry

et al. 2024

Ceramics International

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Hot corrosion behavior of multicomponent rare earth phosphate materials exposed to molten V2O5 salt

Li,

Sun,

et al. 2024

Ceramics International

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Interactions between rare-earth zirconates (RE2Zr2O7) and CMAS silicate melts

Cited by 11 publications

References 51 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

Multilayer GZ/YSZ thermal barrier coating from suspension and solution precursor plasma spray

Hot corrosion behavior of multicomponent rare earth phosphate materials exposed to molten V2O5 salt

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Interactions between rare-earth zirconates (RE2Zr2O7) and CMAS silicate melts

Cited by 11 publications

References 51 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

Multilayer GZ/YSZ thermal barrier coating from suspension and solution precursor plasma spray

Hot corrosion behavior of multicomponent rare earth phosphate materials exposed to molten V2O5 salt

Contact Info

Product

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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