Hot corrosion behavior of La2Zr2O7 with the addition of Y2O3 thermal barrier coatings in contacts with vanadate–sulfate salts

Xu, Zhenhua; He, Limin; Mu, Rende; He, Shi; Huang, Guanghong; Cao, Xia

doi:10.1016/j.jallcom.2010.05.121

Cited by 28 publications

(5 citation statements)

References 21 publications

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“…GdYb-YSZ coatings contain more rare-earth elements than YSZ coatings. Moreover, Yb 2 O 3 has a lower basicity than Y 2 O 3 and Gd 2 O 3 [41,42]. Thus, some rare-earth elements, such as Yb, can remain in the coating as stabilizers when coming in contact with molten salt.…”

Section: Resultsmentioning

confidence: 99%

Hot-Corrosion Behavior of Gd2O3–Yb2O3 Co-Doped YSZ Thermal Barrier Coatings in the Presence of V2O5 Molten Salt

Yang¹,

She²,

Liu³

2023

Coatings

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In this study, thermal barrier coatings (TBC) consisting of 3.5 mol% Yb2O3-stabilized ZrO2 co-doped with 1 mol% Gd2O3 and 1 mol% Yb2O3 (referred to as GdYb-YSZ) were fabricated by means of air plasma spraying. The as-fabricated coatings exhibited a metastable tetragonal (t′) structure. The hot-corrosion behavior of the GdYb–YSZ TBCs was investigated at 700, 800, 900, and 1000 °C for 10 h in the presence of V2O5 molten salt. During the corrosion tests, the t′ phase transformed into a monoclinic (m) phase; nevertheless, it was still detected on the corroded surfaces. The amount of t′ phase decreased with increasing corrosion temperature. The corrosion products formed on the GdYb-YSZ TBCs in V2O5 comprised Yb, Gd-doped YVO4, and m-ZrO2, irrespective of the temperature of corrosion. However, higher temperatures changed the morphologies of the Yb- and Gd-doped YVO4 corrosion products. The GdYb–YSZ TBCs exhibited improved corrosion resistance to V2O5 molten salt when compared to YSZ TBCs, and the related mechanism is discussed in detail in this paper.

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Section: Resultsmentioning

confidence: 99%

Hot-Corrosion Behavior of Gd2O3–Yb2O3 Co-Doped YSZ Thermal Barrier Coatings in the Presence of V2O5 Molten Salt

Yang¹,

She²,

Liu³

2023

Coatings

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“…The most typical corrosive chemicals for TBCs in a gas turbine engine include vanadium compounds (V2O5, NaVO3), sulfur-containing compounds (SO2 and sulfate salts such as Na2SO4, MgSO4), and the mixture of them [73,74]. When the APS deposited LZ based TBC was exposed to the single corrosive chemical at high temperature, it was less damaged by the vanadium compounds (at 1000 o C) but severely attacked by the sulfur-containing compounds (at 900 o C).…”

Section: Hot Corrosion and Cmas Infiltration Damagementioning

confidence: 99%

“…However, the 8YSZ coating showed an excellent resistance to sulfur-containing compounds [73]. In expecting to improve the corrosive resistance from Na2SO4 and V2O5, the LZ coating was deposited using EB-PVD with the addition of Y2O3 [74]. The composited coating exhibited a good resistance to V2O5…”

Section: Hot Corrosion and Cmas Infiltration Damagementioning

confidence: 99%

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Lanthanum zirconate based thermal barrier coatings: A review

Zhang

Guo

Jung

et al. 2017

Surface and Coatings Technology

192

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This review article summarizes the latest information about the manufacturing techniques of lanthanum zirconate (La2Zr2O7, LZ) powder and La2Zr2O7 based thermal barrier coatings (TBCs). Lanthanum zirconate is a promising candidate material for TBC applications, due to its lower thermal conductivity and higher thermal stability compared to other traditional TBC systems. In this work, the physical, thermal, and mechanical properties of the powder and coatings are evaluated. The durability experiments of the TBCs in various thermal, mechanical, and corrosive conditions is also reviewed. In addition, theoretical studies on the powder and coatings properties are presented. Finally, future research directions of lanthanum zirconate as TBC applications are proposed.

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“…The A 2 Zr 2 O 7 -type (A = lanthanide) pyrochlore oxides have attracted great attention for a long time due to their hightemperature stability and various potential domains of applications such as solid electrolytes, oxygen electrodes, catalysts, thermal barrier coating materials, and so on [13][14][15][16] structure shows the well-known ability of the structure to accommodate oxygen nonstoichiometry. Recently, new A 2 Zr 2 O 7 -type oxides are of considerable scientific interests owing to variable cation radius ratios of r(A 3+ )/r(Zr 4+ ) and oxygen nonstoichiometry [7,[17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Preparation, structure and electrical conductivity of the pyrochlore-type phase Sm2Zr2O7 codoped with bivalent magnesium and trivalent dysprosium cations

Xiong

Liu

Ouyang

et al. 2011

Journal of Alloys and Compounds

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Hot corrosion behavior of La2Zr2O7 with the addition of Y2O3 thermal barrier coatings in contacts with vanadate–sulfate salts

Cited by 28 publications

References 21 publications

Hot-Corrosion Behavior of Gd2O3–Yb2O3 Co-Doped YSZ Thermal Barrier Coatings in the Presence of V2O5 Molten Salt

Hot-Corrosion Behavior of Gd2O3–Yb2O3 Co-Doped YSZ Thermal Barrier Coatings in the Presence of V2O5 Molten Salt

Lanthanum zirconate based thermal barrier coatings: A review

Preparation, structure and electrical conductivity of the pyrochlore-type phase Sm2Zr2O7 codoped with bivalent magnesium and trivalent dysprosium cations

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