Microstructure evolution and hot corrosion mechanisms of Ba2REAlO5 (RE = Yb, Er, Dy) exposed to V2O5 + Na2SO4 molten salt

Guo, Liu; Zhang, Chenglong; He, Qing; Yu, Jianxing; Yan, Zheng; Ye, Fuxing; Dan, Chengyi; Ji, Vincent

doi:10.1016/j.jeurceramsoc.2018.03.047

Cited by 14 publications

(7 citation statements)

References 43 publications

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“…As the results, (Sm 0.5 Sc 0.5 ) 2 Zr 2 O 7 showed better hot corrosion resistance to Na 2 SO 4 + V 2 O 5 salt than Sm 2 Zr 2 O 7 . Moreover, prospective Ba 2 REAlO 5 TBC, which is known to have excellent sintering resistance and ultralow thermal conductivity, 68 was also tested in the Na 2 SO 4 + V 2 O 5 containing environment by Lei Guo et al 69 Interestingly, the continuous and dense layers formed on Ba 2 REAlO 5 TBC after exposure. These layers limit the molten salts' further penetration and increase corrosion resistance.…”

Section: Resultsmentioning

confidence: 99%

Research hotspots and future trends of hot corrosion research: a bibliometric analysis

Nurrochman,

Junianto,

Korda

et al. 2023

RSC Adv.

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Section: Resultsmentioning

confidence: 99%

Research hotspots and future trends of hot corrosion research: a bibliometric analysis

Nurrochman,

Junianto,

Korda

et al. 2023

RSC Adv.

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“…The EDS spectrum of the YYG coating with an ultrathin dense layer (as shown in Figure 8) proved that there were no coating elements (such as Y, Yb, Gd) on the surface. The chemical compositions of the surface micrographs of the YYG coating with an ultrathin dense layer after corrosion (as shown in Table 2) show that the surface components are Na2SO4 and NaVO3 [38]. This indicates that the surface of the ceramic layer of the thermal barrier coatings is completely covered in corrosive salts.…”

Section: Corrosion Analysismentioning

confidence: 95%

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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“…The above results indicate that no difference exists in the type of corrosion products of the LYZ coatings in molten V2O5 salt and different Na2SO4+V2O5 mixed salts at 1000 °C, i.e., LaVO4, YbVO4 and m-ZrO2. It is known that the reaction between vanadate and Re2Zr2O7 follows the Lewis acid-base law [14], and the Lewis base La2O3 and Yb2O3 will preferentially react with the vanadate to form LaVO4 and YbVO4. Consequently, the depletion of La2O3 and Yb2O3 in the LYZ solid solution resulted in the partially phase transition from Fʹ phase to the m-ZrO2 phase.…”

Section: Influence Of the Na2so4 On The V2o5 Corrosion Of Lyz Coatingmentioning

confidence: 99%

“…However, for the degradation of TBCs in molten salt, the penetration ability of the molten salt is also of great importance. Previous study found that preventing the penetration of molten salts into the interior of the TBCs could contribute to prolonging its corrosion lifetime [14]. Currently, most research on the corrosion mechanism of TBCs is focused on the chemical reaction process.…”

Section: Influence Of the Na2so4 On The V2o5 Corrosion Of Lyz Coatingmentioning

confidence: 99%

Hot corrosion behaviours of the LaYbZr₂O₇ thermal barrier coatings in different corrosive salts

Yan,

Xiang,

Lei

et al. 2024

J. Phys.: Conf. Ser.

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In this study, the LaYbZr2O7 (LYZ) thermal barrier coatings (TBCs) were deposited by air plasma spray (APS) and were subjected to hot corrosion in the single V2O5 salts and the mixture of V2O5+Na2SO4 with different Na2SO4 content at 1000 °C. The reaction mechanism and corrosion layer evolution of the LYZ coating in different corrosive molten were comparatively investigated. After hot corrosion in the single V2O5 salt, the surface of the LYZ coating develops a dense corrosion layer, which could keep structural integrity with the extension of exposure time, indicating the LYZ coating showed higher resistance to the V2O5 corrosion. However, the dense layer failed to form on the surface of the LYZ coating in the V2O5+Na2SO4 mixed salts. With the increase of Na2SO4 content, the corrosion products formed on the surface of the LYZ coating gradually decreased, and the corrosion layer disappeared. The dominant reason for the difference was that the addition of Na2SO4 resulted in the acidity reduction of the mixed salts, which eventually caused a decrease in the corrosion rate. Compared with the single V2O5, the V2O5+Na2SO4 mixed salts showed higher penetration ability in the LYZ coating and could be more damaging.

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Microstructure evolution and hot corrosion mechanisms of Ba2REAlO5 (RE = Yb, Er, Dy) exposed to V2O5 + Na2SO4 molten salt

Cited by 14 publications

References 43 publications

Research hotspots and future trends of hot corrosion research: a bibliometric analysis

Research hotspots and future trends of hot corrosion research: a bibliometric analysis

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

Hot corrosion behaviours of the LaYbZr₂O₇ thermal barrier coatings in different corrosive salts

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Microstructure evolution and hot corrosion mechanisms of Ba2REAlO5 (RE = Yb, Er, Dy) exposed to V2O5 + Na2SO4 molten salt

Cited by 14 publications

References 43 publications

Research hotspots and future trends of hot corrosion research: a bibliometric analysis

Research hotspots and future trends of hot corrosion research: a bibliometric analysis

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

Hot corrosion behaviours of the LaYbZr2O7 thermal barrier coatings in different corrosive salts

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Product

Resources

About

Microstructure evolution and hot corrosion mechanisms of Ba2REAlO5 (RE = Yb, Er, Dy) exposed to V2O5 + Na2SO4 molten salt

Hot corrosion behaviours of the LaYbZr₂O₇ thermal barrier coatings in different corrosive salts