Thermal conductivity of Na2O–B2O3–SiO2 melts

Nishi, Tsuyoshi; Manako, Takumi; Ohnuma, Katsuya; Ohta, Hiromichi; Sukenaga, Sohei; Shibata, Hiroyuki; Oniki, Toshiro

doi:10.1080/00223131.2019.1617206

Cited by 3 publications

(7 citation statements)

References 9 publications

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“…Highly pure silica (SiO 2 ) is a raw material for the manufacture of glass, − optical fibers, essential electronic parts, optical instruments, and refractory materials . In conventional diffusion flame synthesis (DFS) of SiO 2 , H 2 or CH 4 is used as the fuel, and O 2 is used as the oxidizer, and dry argon (Ar) is used as the carrier gas that brings the precursor into a high-temperature flame.…”

Section: Resultsmentioning

confidence: 99%

Thermodynamic Analysis of the Key Reactions in Synthesizing Inorganic Silicon Compounds or Products

Xia

Gao

Zhang

et al. 2023

Ind. Eng. Chem. Res.

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Inorganic silicon compounds or products, such as silicon oxides (SiO 2 ), metallurgical silicon (m-Si), silicon carbide (SiC), silicon halides (such as SiH n Cl 4−n , n = 0−4 or SiX n , X = F, n = 2; X = Br, n = 4), silicon hydrides (SiH 4 and Si 2 H 6 ), nitrogen compounds (Si 3 N 4 ), and the others (Si 2 Cl 6 and Si 2 OCl 6 ), have been remarkably developed in the past years. Silicon chemistry involves various important reactions, such as the hydrochlorination of silicon to chlorosilanes, hydrogenation of silicon tetrachloride in the presence of silicon to trichlorosilane, reduction of quartz sand by carbon to silicon, silicon carbide, and silicon monoxide (also known as the Acheson process). Understanding the basic thermodynamics of these reactions is essential for optimizing the related reaction conditions and catalyst development (if any). This work comprehensively investigated the thermodynamics of siliconrelated reactions by using the Gibbs energy minimization method. The effects of the reaction conditions, including temperature, pressure, and ratio of reactants, on the conversion of reactants and the product selectivity, are quantitatively calculated in detail. Optimal operational conditions for each reaction are suggested. This work provides a comprehensive reference for reaction thermodynamics for silicon-related key industrial reactions.

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Section: Resultsmentioning

confidence: 99%

Thermodynamic Analysis of the Key Reactions in Synthesizing Inorganic Silicon Compounds or Products

Xia

Gao

Zhang

et al. 2023

Ind. Eng. Chem. Res.

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“…[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%

“…29) Clearly, the melt thermal conductivities decreased and increased with increasing B 2 O 3 /SiO 2 ratio to and from 0. 29,30) The characteristic thermal conductivities of borosilicate glasses are attributed to borate-induced changes in the NBO/T ratio in silicate networks.…”

Section: Thermal Conductivitymentioning

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

Self Cite

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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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Thermal Conductivity of Borosilicate Melts

Nishi

Ohta

2019

Materia Japan

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Thermal conductivity of Na₂O–B₂O₃–SiO₂ melts

Cited by 3 publications

References 9 publications

Thermodynamic Analysis of the Key Reactions in Synthesizing Inorganic Silicon Compounds or Products

Thermodynamic Analysis of the Key Reactions in Synthesizing Inorganic Silicon Compounds or Products

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

Thermal Conductivity of Borosilicate Melts

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