Preparation and thermal shock resistance of anorthite solar thermal energy storage ceramics from magnesium slag

Wu, Jianfeng; Yu, Jiaqi; Xu, Xin; Liu, Yang; Zhang, Zhenyu; Wei, Peng

doi:10.1016/j.ceramint.2022.07.305

Cited by 22 publications

(5 citation statements)

References 21 publications

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“…From room temperature to 1000°C, heat capacity increases with temperature due to intensified lattice vibration at high temperatures 27 . The high specific heat capacity indicates excellent high temperature adaptability and high heat storage efficiency 28 . From room temperature to 1000°C, the specific heat capacity of sample B4 is .44–1.25 J/(g K).…”

Section: Methodsmentioning

confidence: 99%

“…27 The high specific heat capacity indicates excellent high temperature adaptability and high heat storage efficiency. 28 From room temperature to 1000 • C, the specific heat capacity of sample B4 is .44-1.25 J/(g K). According to Equation ( 5), the value of heat storage density from room temperature to 1000 • C can be calculated.…”

Section: Thermal Physical Propertiesmentioning

confidence: 99%

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Study on magnesia alumina spinel heat storage ceramics for solar thermal power generation

Xu,

Cheng,

Hao

et al. 2024

Int J Applied Ceramic Tech

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Solar thermal storage ceramic materials use photothermal power generation technology to store heat energy, which is an important way to use clean energy and reduce carbon emissions. In this paper, MgAl2O4 ceramics were prepared by pressureless sintering with fused magnesia and α‐Al2O3 as the primary raw materials and TiO2 as the additive. The phase composition, microstructure, physical properties, thermal shock resistance, and thermal physical properties of MgAl2O4 thermal storage ceramics were studied. The results show that the main crystalline phase of B4 is MgAl2O4 and the secondary crystalline phase is MgTi2O5. Ti4+ is dissolved into MgAl2O4 lattice, which distorts the lattice, reduces activation energy, and promotes sintering. The sample B4 (69.73 wt% α‐Al2O3, 30.27 wt% fused magnesia, and 7 wt% TiO2) sintered at 1510°C had the best comprehensive physical properties, and its bending strength and bulk density were 89.41 MPa and 3.27 g/cm3, respectively. After 30 thermal shock cycles, the bending strength of the sample B4 is slightly lost. The thermal stress generated during the expansion and contraction of the grain volume led to the decrease of the bending strength. From room temperature to 1000°C, the specific heat capacity of sample B4 is .44–1.25 J/(g·K). The heat capacity increases with the increase of temperature, and the heat storage density increases. The heat storage density is 1218.75 kJ/kg (1000°C). Heat capacity increases with temperature due to intensified lattice vibration at high temperatures. Therefore, magnesia alumina spinel ceramics show great potential in solar thermal energy storage.

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Section: Methodsmentioning

confidence: 99%

Section: Thermal Physical Propertiesmentioning

confidence: 99%

Study on magnesia alumina spinel heat storage ceramics for solar thermal power generation

Xu,

Cheng,

Hao

et al. 2024

Int J Applied Ceramic Tech

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“…Second, when microcrack nucleation occurs, the stress redistribution at the main crack tip due to the release of residual stress 81 . When the main crack leading to fracture expands, these uniformly distributed microcracks will prompt the main crack to bifurcate, making the main crack expansion path zigzag and uneven, increasing the surface energy in the expansion process, thus impeding the rapid expansion of the crack and increasing the material toughness 82 …”

Section: Toughening Mechanisms Of Glass‐ceramicsmentioning

confidence: 99%

Recent advances in glass‐ceramics: Performance and toughening mechanisms in restorative dentistry

Liu,

Yao,

Zhang

et al. 2023

J Biomed Mater Res

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The use of glass‐ceramics in the medical field has grown significantly since the 1980s. With excellent aesthetic properties, semi‐translucency, outstanding mechanical properties, corrosion resistance, wear resistance and great biocompatibility and workability glass‐ceramics is one of the most commonly used materials in restorative dentistry and is widely used in veneers, inlays, onlays, all‐ceramic crowns, and implant abutments. This review provides an overview of the research progress of glass‐ceramics in restorative dentistry, focusing on the classification, performance requirements, toughening mechanisms and their association with clinical performance, as well as the manufacturing and fabrication of glass‐ceramics in restorative dentistry. Finally, the developments and prospects of glass‐ceramics in restorative dentistry are summarized and discussed.

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“…The coefficient of thermal expansion between different compositions has a significant effect on the mechanical properties and thermal stability of the ceramic products [ 6 , 7 , 8 , 9 , 10 , 11 ]. To form the mullite/anorthite multiphase and improve the performance of ceramics, anorthite (4.8 × 10 −6 K −1 ) may be introduced into the sintered compact as an alternative method [ 12 ].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Anorthite/Mullite In Situ and Phase Transformation in Porcelain

Lin

Zhong

et al. 2023

Materials

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A high sintering temperature is required to acquire excellent performance in the production of porcelain but results in high fuel consumption. To prepare the porcelain with outstanding performance at a lower temperature, a self-produced additive containing calcium (CaK) was added into a three-component system of kaolinite–feldspar–quartz. XRD and SEM were used to characterize the samples. The toughening mechanism and Gibbs free energy were investigated. After introducing the CaK, the bending strength of the porcelain fired at 1513 K increased from 56.32 ± 0.65 MPa to 95.31 ± 0.63 MPa, which was 21.83% higher than that of the porcelain without CaK at an optimal firing temperature of 1603 K. The main crystal phase of the sample comprised mullite and quartz in the raw materials at 1453~1603 K. The anorthite was observed at 1453 K and interlocked with needle-shaped mullite at 1513 K in the porcelain after adding CaK, which resulted in the higher bending strength. Quantitative analysis indicated that the amount of anorthite decreased at 1513 K and disappeared at 1543 K; the amount of mullite increased with temperature. The Gibbs free energy of the reaction (CaO•Al2O3•2SiO2 + 2(Al2O3•2SiO2) → 3Al2O3•2SiO2 + CaO + 4SiO2) at high temperature was negative, which suggested that the formation of mullite (3Al2O3•2SiO2) from anorthite (CaO•Al2O3•2SiO2) was possible. These findings implied that the addition of CaK contributed to the appropriate phase composition and microstructure, and the excellent performance of the porcelain at a lower temperature. In addition, the transformation between anorthite and mullite was possible in the special raw material system. The results are of interest in producing anorthite/mullite ceramics at reduced sintering temperatures and the conversion between anorthite and mullite.

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Preparation and thermal shock resistance of anorthite solar thermal energy storage ceramics from magnesium slag

Cited by 22 publications

References 21 publications

Study on magnesia alumina spinel heat storage ceramics for solar thermal power generation

Study on magnesia alumina spinel heat storage ceramics for solar thermal power generation

Recent advances in glass‐ceramics: Performance and toughening mechanisms in restorative dentistry

Preparation of Anorthite/Mullite In Situ and Phase Transformation in Porcelain

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