Determination of thermal conductivities of B2O3-SiO2 and CaO-B2O3-SiO2 melts

Nishi, Tsuyoshi; Tanaka, Kihachiro; Ohnuma, Katsuya; Manako, Takumi; Ohta, Hiromichi; Sukenaga, Sohei; Shibata, Hiroyuki; Kakihara, Toshiaki

doi:10.1016/j.jnucmat.2018.08.010

Cited by 10 publications

(15 citation statements)

References 9 publications

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“…16) Furthermore, CaO-SiO 2 -20 mass% Al 2 O 3 (CaO/SiO 2 = 0.67, 1.00, or 1.22) ternary melts containing alkaline-earth oxides such as MgO or BaO exhibited similar viscosity trends. 16) The influences of basicity and alkali and alkaline-earth oxide contents on the melt viscosity are explained based on structural data obtained from 27 Al and 29 Si MAS NMR spectra.…”

Section: Viscositymentioning

confidence: 99%

“…[25][26][27][28] To study the influences of the Na and Ca contents on the thermal conductivities of borosilicate melts, melt properties were systematically measured using a specially developed laser flash method. 29,30) The thermal conductivities of B 2 O 3 -SiO 2 -based glasses (B1-B4) and 27-29-mass% CaO-B 2 O 3 -SiO 2 -based glasses (C1-C4) prepared using different B 2 O 3 /SiO 2 ratios were measured using the laser flash method and a cell configured for front heating and detection in the range 1 548-1 573 K, and the results are summarized in Fig. 8.…”

Section: Thermal Conductivitymentioning

confidence: 99%

“…[13][14][15][16][17][18][19][20][21][22][23] However, because of errors in experimental data collected under different conditions at different laboratories, systematic experiments must be conducted. 9) To measure physical properties and elucidate reaction mechanisms, structures have previously been analyzed using methods such as Raman spectroscopy and 29 Si magic-angle-spinning magnetic resonance spectroscopy (MAS NMR), which are powerful for detecting SiO 2 -network polymerization and depolymerization in melts and glasses. SiO 2 -network structural units represent a combination of different Q n species exhibiting BOs and NBOs, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, a method must be developed for fabricating stable glasses. [24][25][26][27][28][29][30][31] SiO 2 is the main component in silicate glasses used to store spent nuclear fuels, and borate (B 2 O 3 ) and/or phosphate (P 2 O 5 ) is/ are added to modify the glass properties. Because of their high strengths and neutron-absorption capacities, borosilicate glasses are attracting considerable attention for storing spent nuclear fuels.…”

Section: Introductionmentioning

confidence: 99%

“…Because the viscosities and thermal conductivities of these glasses must be controlled at high temperatures, glass structures have also been studied using 11 B MAS NMR. [29][30][31] Additionally, fluorides are used for electrolytically extracting rare metals and aluminum from ores and scrap metals melted at high temperatures. 32,33) Accordingly, the production of molten alkali/alkaline-earth halide salts is very important.…”

Section: Introductionmentioning

confidence: 99%

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Structural Analysis Methods for Characterizing Multicomponent Melts and Glasses Processed at High Temperatures

et al. 2023

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Recent structural-analysis research was reviewed for characterizing multicomponent melts and glasses processed at high temperatures. Multicomponent melts and glasses are often formed in slags during pyrometallurgical processing and the vitrification of highly radioactive wastes from nuclear power plants. Melt and glass physical properties were interpreted based on structural analyses using different methods. For example, the viscosities of different molten-silicate compositions were explained based on Raman and magic-angle-spinning magnetic resonance (MAS NMR) spectra. In addition, the thermal conductivities of multicomponent vitrified glasses were examined based on the structures elucidated using MAS NMR spectroscopy. X-ray absorption spectroscopy, which provides information about element chemical states, is used to analyze the local structure around specific elements in both melts and glasses. These studies show that structural analysis methods provide important information for designing and controlling melts and glasses processed at high temperatures. The structures characterized using different analysis methods were presented to elucidate the physical properties of multicomponent melts and glasses processed at high temperatures and propose prospects and directions for further research of process-oriented methods.

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Section: Viscositymentioning

confidence: 99%

Section: Thermal Conductivitymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structural Analysis Methods for Characterizing Multicomponent Melts and Glasses Processed at High Temperatures

et al. 2023

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Chameleon‐Inspired, Dipole Moment‐Increasing, Fire‐Retardant Strategies Toward Promoting the Practical Application of Radiative Cooling Materials

Cai,

Qi,

Cui

et al. 2024

Adv Funct Materials

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Toward addressing the aesthetic demand, IR emissivity, and fire hazards of radiative cooling materials in the practical application, chameleon‐inspired is tactfully employed, dipole moment‐increasing, and fire‐retardant strategies to manufacture an advanced polyurea‐based composite coating through incorporating thermochromic microcapsules, boron nitride nanosheets, and montmorillonite nanosheets. The chameleon‐inspired thermochromic microcapsules and admirable IR emissivity (supported by the original IR emittance spectra) realized by the increasing dipole moment allow the composite coatings to spontaneously adjust the solar absorption and reflection during hot daytime, while enabling high‐efficiency radiative cooling throughout the day. The IR emissivity higher than most literature is attributed to the strong interfacial interactions within polyurea composite coatings which improve the dipole moment of C─O─C, Si─O, and B─N bonds by increasing the distance between the centers of positive and negative charges, thus producing more IR emissions. Furthermore, the thermally melted montmorillonite nanosheets can form a ceramic protective layer enhanced by boron nitride nanosheets, further suppressing combustion behavior to improve the fire safety performance of polyurea coatings. The integration of thermochromic functionality, high fire safety, and admirable IR emissivity not only contribute to promoting the practical application of radiative cooling materials, but also provide a precious reference route to design high IR emissivity.

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The Methodology Development for Improving Energy Utilization and Reducing Fluoride Pollution of the Electroslag Remelting Process: A Review

Duan

2020

steel research int.

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Traditional electroslag remelting (ESR) technology using the slag with a high CaF2 content is faced with a high specific power consumption and fluoride pollution. Under double pressure, it is therefore very important to have a good understanding of the ESR process. The energy utilization, η, of the ESR depends on both the electrical, ηE, and thermal efficiency, ηH. Tailoring slag composition is one of the useful techniques to enhance energy utilization, because slag is very important to generate Joule heat for melting electrodes, control horizontal heat transfer, and maintain uniform distribution of alloy elements from the bottom to top of the remelted ingots in the ESR process. Therefore, herein, the aim is to review the effects of slag composition, especially CaF2 content, and temperature on the electrical conductivity and thermal conductivity, which further influence the heat balance during the ESR process. The volatilization mechanism of the liquid fluoride‐containing slag at an elevated temperature is introduced from the perspective of thermodynamics and kinetics. Meanwhile, some of the recent advances and technology improvements in energy utilization and productivity enhancements for the ESR process are summarized, which provide benefits to achieve sustainable development for the ESR process.

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Determination of thermal conductivities of B2O3-SiO2 and CaO-B2O3-SiO2 melts

Cited by 10 publications

References 9 publications

Structural Analysis Methods for Characterizing Multicomponent Melts and Glasses Processed at High Temperatures

Structural Analysis Methods for Characterizing Multicomponent Melts and Glasses Processed at High Temperatures

Chameleon‐Inspired, Dipole Moment‐Increasing, Fire‐Retardant Strategies Toward Promoting the Practical Application of Radiative Cooling Materials

The Methodology Development for Improving Energy Utilization and Reducing Fluoride Pollution of the Electroslag Remelting Process: A Review

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