Effect of Fe2O3–TiO2-Sm2O3 composite additive on sintering behavior and thermal properties of Al2O3 ceramics for thermal storage

Xu, Xin; Zhang, Qiankun; Wu, Jianfeng; Zhang, Zhenyu; Wei, Ping; Yang, Linjun

doi:10.1016/j.ceramint.2021.12.359

Cited by 5 publications

(2 citation statements)

References 26 publications

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“…Xu 9 systematically studied the effects of additives (Fe 2 O 3 , TiO 2 , and Sm 2 O 3 ) on Al 2 O 3 ‐based ceramics for solar thermal storage. The results showed that Fe 2 O 3 and TiO 2 promoted grain growth through a solid solution mechanism, but Sm 2 O 3 preferred to form SmFe 4 Al 8 O 19 at the grain boundaries, which slowed grain growth and refined the grains.…”

Section: Introductionmentioning

confidence: 99%

Thermal shock resistance and dimensional stability of zirconia‐corundum‐mullite composites for solar thermal storage

Zhou,

Wu,

et al. 2023

Int J Applied Ceramic Tech

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Zirconia‐corundum‐mullite composites were prepared from andalusite, ZrO2, and α‐Al2O3 and evaluated for application as solar thermal storage materials in this study. The effects of ZrO2 concentration (0–25 wt%) and sintering temperature(1500–1650°C) on the bending strength, phase composition, microstructure, dimensional stability, and thermal shock resistance of the samples were investigated. The results showed that sample C2 (containing 10 wt% ZrO2) sintered at 1600°C exhibited the best properties. A portion of Y2O3 existed in ZrO2, which excited a small amount of t‐ZrO2 in the sample after sintering, while the other portion of Y2O3 was separated from ZrO2 and participated in the formation of a high‐temperature liquid phase. The liquid phase reduced the dimensional stability of the sample. However, the liquid phase could also promote sintering, reducing the optimal sintering temperature, with lower sintering temperatures increasing the dimensional stability of the sample. Once again, the C2 sample exhibited the highest thermal shock resistance, with a strength loss of 2.76 MPa after 30 thermal shock tests. The thermal storage density(25–1100°C) of C2 was 1121 kJ/kg. In summary, sample C2 exhibits a high degree of dimensional stability and thermal shock resistance and can thus be used as a reliable solar thermal storage material.

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Section: Introductionmentioning

confidence: 99%

Thermal shock resistance and dimensional stability of zirconia‐corundum‐mullite composites for solar thermal storage

Zhou,

Wu,

et al. 2023

Int J Applied Ceramic Tech

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“…This work studies the effects of both potassium loading and calcination temperature on the structure and electronic state of synthesized potassium-doped iron oxide. Based on recent studies, the calcination temperature may affect the catalytic activity of iron oxide-based catalysts by changing the electronic and chemical state of potassium in the vicinity of iron oxide [ 26 , 27 , 28 ]. On the other hand, the changing composition of potassium may also affect active sites on the catalyst and, thereby, the catalytic performance [ 29 , 30 , 31 ].…”

Section: Introductionmentioning

confidence: 99%

Chemical State of Potassium on the Surface of Iron Oxides: Effects of Potassium Precursor Concentration and Calcination Temperature

et al. 2022

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Potassium is used extensively as a promoter with iron catalysts in Fisher–Tropsch synthesis, water–gas shift reactions, steam reforming, and alcohol synthesis. In this paper, the identification of potassium chemical states on the surface of iron catalysts is studied to improve our understanding of the catalytic system. Herein, potassium-doped iron oxide (α-Fe2O3) nanomaterials are synthesized under variable calcination temperatures (400–800 °C) using an incipient wetness impregnation method. The synthesis also varies the content of potassium nitrate deposited on superfine iron oxide with a diameter of 3 nm (Nanocat®) to reach atomic ratios of 100 Fe:x K (x = 0–5). The structure, composition, and properties of the synthesized materials are investigated by X-ray diffraction, differential scanning calorimetry, thermogravimetric analysis, Fourier-transform infrared, Raman spectroscopy, inductively coupled plasma-atomic emission spectroscopy, and X-ray photoelectron spectroscopy, as well as transmission electron microscopy, with energy-dispersive X-ray spectroscopy and selected area electron diffraction. The hematite phase of iron oxide retains its structure up to 700 °C without forming any new mixed phase. For compositions as high as 100 Fe:5 K, potassium nitrate remains stable up to 400 °C, but at 500 °C, it starts to decompose into nitrites and, at only 800 °C, it completely decomposes to potassium oxide (K2O) and a mixed phase, K2Fe22O34. The doping of potassium nitrate on the surface of α-Fe2O3 provides a new material with potential applications in Fisher–Tropsch catalysis, photocatalysis, and photoelectrochemical processes.

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Fabrication and properties of high-thermal-storage RTO ceramics using bauxite tailings and red mud

Chai

Chen

Fang

et al. 2023

Ceramics International

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Effect of Fe2O3–TiO2-Sm2O3 composite additive on sintering behavior and thermal properties of Al2O3 ceramics for thermal storage

Cited by 5 publications

References 26 publications

Thermal shock resistance and dimensional stability of zirconia‐corundum‐mullite composites for solar thermal storage

Thermal shock resistance and dimensional stability of zirconia‐corundum‐mullite composites for solar thermal storage

Chemical State of Potassium on the Surface of Iron Oxides: Effects of Potassium Precursor Concentration and Calcination Temperature

Fabrication and properties of high-thermal-storage RTO ceramics using bauxite tailings and red mud

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