Hot Corrosion Behavior of BaLa2Ti3O10 Thermal Barrier Ceramics in V2O5 and Na2SO4 + V2O5 Molten Salts

Liu, Hui; Jin, Chengyan; Zhu, Jihong

doi:10.3390/coatings9060351

Cited by 5 publications

(3 citation statements)

References 35 publications

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“…Liu et al [46] discovered the influence of molten salts (Na2SO4, and V2O5) on the ceramic material (BaLa2Ti3O10). According to the results of this investigation, BaLa2Ti3O10 ceramic, a potential candidate for Thermal Barrier Coating, exhibits greater resistance to V2O5 salt corrosion despite having strong resistance to both salts.…”

Section: La2hf2o7mentioning

confidence: 99%

Overview of corrosion behaviour of ceramic materials in molten salt environments

Ndukwe,

Okolo,

Nwadirichi

2024

Zas Mat

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This study reviewed previous studies between the years 2015 and 2021 on how ceramic materials degraded in the presence of molten salt environments. The processes of corrosion resistance of various ceramic compositions subjected to various molten salt compositions and temperatures were also scrutinized. The results offer important new insights into the variables affecting ceramics' corrosion behaviour and the production of corrosion products. The reported result reveals that the ceramic material with the composition (Sm0.5Sc0.5)2Zr2O7 performed better than that of Sm2Zr2O7 in terms of hot corrosion resistance in molten salt (V2O5 + Na2SO4). It has also been reported that corrosion behaviour is influenced by particle size. Notably, zirconia (n-YSZ) with nanoscale grain sizes was more susceptible to hot corrosion, which was explained by increased specific surface areas. On the other hand, sintering and additives have been found to enhance corrosion resistance. The Y-Y2Si2O7 ceramic's resistance to corrosion in (V2O5 + Na2SO4) molten salt was enhanced by the addition of alumina. The results of these investigations help us understand how corrosion works and what influences ceramic materials' susceptibility to deterioration in molten salt media. This information can direct the creation of more corrosive-resistant ceramic materials for use in high-temperature environments or molten salt-based energy systems, among other corrosive uses.

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Section: La2hf2o7mentioning

confidence: 99%

Overview of corrosion behaviour of ceramic materials in molten salt environments

Ndukwe,

Okolo,

Nwadirichi

2024

Zas Mat

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“…However, the working temperature of YSZ TBCs is strictly limited to below 1200 • C, which seriously hinders the development of advanced engines with higher temperature capability. At higher temperatures above 1200 • C, YSZ TBCs suffer from undesirable phase transformation (t' decomposes into cubic (c) and tetragonal (t) phases, with the t phase transforming deleteriously to monoclinic (m) phase on cooling), deterioration of strain tolerance and thermal insulation capacity resulting from coating densification, as well as severe corrosion either from environmental deposits under specific flight routes or from corrosive salts in low-quality fuels [6][7][8][9]. Consequently, the search for new TBC materials that could work stably for long term at higher working temperatures has never stopped.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Yb2O3-Gd2O3-Y2O3 Co-Doped ZrO2 Agglomerated and Calcined Powders for Air Plasma Spraying

et al. 2021

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Yb2O3-Gd2O3-Y2O3 co-doped ZrO2 (YGYZ) is considered to be a promising material in thermal barrier coating (TBC) applications. In this study, 2Yb2O3–2Gd2O3–6Y2O3–90ZrO2 (mol.%) (10YGYZ) feedstock candidates for air plasma spraying (APS) were prepared by calcination of agglomerated powders at 1100, 1200, 1300, 1400, and 1500 °C for 3 h, respectively. Incomplete solid solution was observed in calcined powders at 1100, 1200 and 1300 °C, and the 1500 °C calcined powder exhibited poor flowability due to intense sintering effect. The 1400 °C calcined powders were eventually determined to be the optimized feedstock for proper phase structure (cubic phase), great flowability, suitable apparent density and particle size distribution, etc. 10YGYZ TBCs with the optimized feedstock were prepared by APS, exhibiting pure c phase and good chemical uniformity. Controllable preparation of coatings with different porosity (i.e., 7%–9% and 12%–14%) was realized by stand-off distance adjustment.

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“…However, the presence of voids and segmented cracks at the top surface of plasma sprayed coating, lead to decrease the life time of the coating [8,9]. Surface defects act as the path for penetration of oxygen and contaminates from the low grade fuel to attack the TBCs system [10]. Tremendous techniques were used to improve the performance of TBCs [11,12].…”

Section: Introductionmentioning

confidence: 99%

Effect of Laser Treatment on the Surface Roughness of Multilayer Plasma Sprayed Thermal Barrier Coating System

Habeeb¹,

Kadhim²,

Hashim³

et al. 2021

ETJ

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Thermal barrier coatings (TBCs) are used in advanced engines working at higher temperatures. Higher efficiency and performance of gas turbine engines will require careful selection of TBCs. In this study, Ni22Cr10Al1.0Y (Amdry 9625) bond coat and two types of top coat including ceria stabilized zirconia (CSZ) ZrO2-24CeO2-2.5Y2O3) and yttria stabilized zirconia (YSZ) ZrO2-8Y2O3 were deposited on IN 625 by air plasma spraying (APS). The thickness of the duplex ceramic coat based on zirconia was in the range between 350 to 400 µm. The effect of high power Yb:YAG solid state laser at different laser parameters on feature, microstructure and roughness of plasma sprayed and laser sealed coating of multilayer ceria stabilized zirconia/ yttria stabilized zirconia was investigated. Surface roughness has been reduced significantly after laser sealing. The effect of laser process parameters carried out using Taguchi’s L16 orthogonal array design. Minimum roughness can be obtained at moderate power density and longer interaction time with sufficient specific energy to produce complete melting of coating. Characterization and analysis of results was achieved by employing scanning electron microscopy (SEM) , (EDS) and image J analysis. It was found from the results, there were significant improvements in the performance of plasma sprayed coatings after laser sealing due to the reduction of surface coating defects.

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Hot Corrosion Behavior of BaLa2Ti3O10 Thermal Barrier Ceramics in V2O5 and Na2SO4 + V2O5 Molten Salts

Cited by 5 publications

References 35 publications

Overview of corrosion behaviour of ceramic materials in molten salt environments

Overview of corrosion behaviour of ceramic materials in molten salt environments

Optimization of Yb2O3-Gd2O3-Y2O3 Co-Doped ZrO2 Agglomerated and Calcined Powders for Air Plasma Spraying

Effect of Laser Treatment on the Surface Roughness of Multilayer Plasma Sprayed Thermal Barrier Coating System

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