Hot corrosion behavior of Yb2Si2O7 ceramic under NaVO3 salt attack

Zhang, Yongqiu; Zou, Binglin; Xi, Cai; Wang, Ying; Cao, Xueqiang

doi:10.1016/j.ceramint.2019.09.070

Cited by 10 publications

(3 citation statements)

References 28 publications

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“…This implies that at this higher temperature, the material is more prone to corrosion. Finally, Zhang et al [57] undertook a study to determine the behaviour of Yb2Si2O7 ceramics when exposed to molten salt (NaVO3) at 1000°C-1500°C. They observed that the reaction between Yb2Si2O7 and NaVO3 produced rodshaped YbVO4 (ytterbium vanadate) grains at temperatures between 1000 and 1200 °C.…”

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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“…For rare earth silicates, the chemical compositions and crystal structures have a signi cantly in uence on their mechanical and corrosion resistance [17,[22][23][24][25]. Rare earth silicates powders are mainly synthesized by solid-state reaction [19,[26][27][28][29][30], hydrothermal syntheses [31], sol-gel [32][33][34][35][36] and chemical coprecipitation methods [37]. For solid-state reaction method, rare earth silicates powders were synthesized through direct reaction between rare earth oxide and silicon oxide at relatively higher calcination temperature, however, the obtained powders usually have micron-scale and exhibit agglomeration to some extent.…”

Section: Introductionmentioning

confidence: 99%

Structural evolution and synthesis mechanism of ytterbium disilicate powders prepared by cocurrent chemical coprecipitation method

Wang

Liu

et al. 2022

Ceramics International

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Ytterbium disilicate powders were synthesized by cocurrent chemical coprecipitation method. The in uence of Si/Yb molar ratio and calcination temperature on compositions and structures of Yb 2 Si 2 O 7 products were investigated. The formation mechanism and thermal behavior of precursor as well as the phase evolution of Yb 2 Si 2 O 7 were also discussed in depth. Results show that pure β-Yb 2 Si 2 O 7 powders with nanoscale size can be obtained from the precursor with Si/Yb molar ratio of 1.1 after being calcinated at temperatures above 1200 ℃. The Yb 2 Si 2 O 7 precursor is an amorphous polymer crosslinked with -[Si-O-Yb]-chain segments which are formed though Yb atoms embedding in the -[Si-O-Si]network. After a continuous dihydroxylation and structural ordering, the amorphous precursor transformed to α-Yb 2 Si 2 O 7 crystals by atomic rearrangement. Elevated calcination temperature can induce to the coordination structures and environment evolutions of structural units and then converted to stable (Si 2 O 7 ) groups and (YbO 6 ) polyhedrons, which results in the formation of β-Yb 2 Si 2 O 7 .

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“…Recently, Fan et al [17] investigated the hot corrosion behavior of γ-Y 2 Si 2 O 7 in the molten salt of Na 2 SO 4 and V 2 O 5 . Also, the hot corrosion behavior of Yb 2 Si 2 O 7 bulk under NaVO 3 salt at 1000-1500°C was studied in our group [18]. Although the working temperature of the Yb 2 Si 2 O 7 used as EBCs can exceed 1000°C, the operating temperatures of turbine engine blades at different positions are different.…”

Section: Introductionmentioning

confidence: 99%

Hot corrosion behavior of Yb2Si2O7 ceramic by NaVO3 at 500 °C to 900 °C

Zhang

Zou

et al. 2021

Journal of Asian Ceramic Societies

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The hot corrosion behavior of Yb 2 Si 2 O 7 bulk exposed to NaVO 3 was investigated at 500-900°C. Results indicated that the hot corrosion reaction could occur at 500°C, the corrosion products were composed of YbVO 4 and SiO 2 at 500-900°C. The content of YbVO 4 and SiO 2 in the corrosion product at 500°C was small and the crystal size of YbVO 4 was fine. As temperature increased, a continuous and dense corrosion layer could be formed on the bulk surface, which prevented the hot corrosion reaction from occurring dramatically. The hot corrosion reaction products mainly consisted of rod-shaped YbVO 4 beyond 600°C. Since the corrosion reaction driving force increased with temperature, the rod-like YbVO 4 crystals tended to go from slender to plump; moreover, both ends changed from irregular lamination to regular quadrangular pyramid shape; also SiO 2 crystals partly changed from flocculent to ellipsoid shape. The hot corrosion mechanisms of Yb 2 Si 2 O 7 bulk exposed to NaVO 3 at 500-900°C were investigated based on the corrosion products.

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Hot corrosion behavior of Yb2Si2O7 ceramic under NaVO3 salt attack

Cited by 10 publications

References 28 publications

Overview of corrosion behaviour of ceramic materials in molten salt environments

Overview of corrosion behaviour of ceramic materials in molten salt environments

Structural evolution and synthesis mechanism of ytterbium disilicate powders prepared by cocurrent chemical coprecipitation method

Hot corrosion behavior of Yb2Si2O7 ceramic by NaVO3 at 500 °C to 900 °C

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