Investigation of viscosity and structure of CaO-SiO2-MgO-Al2O3-BaO-B2O3 slag melt

Liu, Wenguo; Pang, Zhuogang; Wang, Jingsong; Zuo, Haibin; Xue, Qingguo

doi:10.1016/j.ceramint.2022.02.268

Cited by 25 publications

(19 citation statements)

References 34 publications

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“…As it is well known, the units of B-O network in the oxide melt are less stable than that of Si-O and Al-O bonding, which leads to a decreased melt viscosity. 32,35,36 The molar fractions of SiO 2 , Al 2 O 3 , and TiO 2 in the melt were decreased by 11.77%, 11.82%, and 11.96% when B 2 O 3 content increased from 18.70 to 28.28 mol.%, respectively. This also indicates that an increased B 2 O 3 content reduced the melt network strength and symmetry, which in turn lead to a reduction in viscosity.…”

Section: Effects Of B 2 O 3 /Sio 2 Molar Ratio and B 2 O 3 Content On...mentioning

confidence: 96%

“…The viscous activation energy (E η ) reflects the fluidity of the melt, which can characterize the sensitivity of the viscosity to temperature. Many researchers 20,29,30,32 have used the Arrhenius equation 37 to calculate E η . The fitting lines of experimental data are plotted in Figure 5, where lnη shows a linear correlation with 1/T.…”

Section: Effects Of B 2 O 3 /Sio 2 Molar Ratio and B 2 O 3 Content On...mentioning

confidence: 99%

“…26,27 The effect of B 2 O 3 con-tent on the viscosity and structure of silicate-based slags was studied in the past. [26][27][28][29][30][31][32] Sadaf et al 26 investigated the viscosity and crystallization behavior of (45 − 0.556x) CaO-(36 − 0.444x) SiO 2 -(4 + x) B 2 O 3 -4 Al 2 O 3 -8 Na 2 O-2 MgO-Li 2 O slag at 1300 • C. No crystallization phenomenon was observed when B 2 O 3 content exceeded 6 wt.%. Although the increase of B 2 O 3 content improved the degree of polymerization (DOP), it reduced the provided percentage of silicate unit in the melt due to the increase of [BO 3 ] unit.…”

Section: Introductionmentioning

confidence: 99%

“…This process disrupts the homogeneity of the structure, and affects both the slag viscosity and the viscous activation energy. Liu et al 32 found that the DOP of ( 37 In order to develop a novel B 2 O 3 -SiO 2 -based glass lubricant with an appropriate viscosity for the extrusion of TC4 alloy, viscosity and melt structure study on the designed glass lubricants were carried out in this paper. Al 2 O 3 , Na 2 O, and TiO 2 were selected as the secondary material due to their functions on glass property adjustment.…”

Section: Introductionmentioning

confidence: 99%

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Effect of B₂O₃/SiO₂ molar ratio and B₂O₃ content on viscosity and structure of B₂O₃–SiO₂–Al₂O₃–Na₂O–TiO₂ glass lubricant

Cui,

Lv,

et al. 2024

J Am Ceram Soc.

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Glass lubricant with a suitable viscosity is essential for producing high‐quality titanium products by the hot extrusion process. In this study, a novel lubricant of B2O3–SiO2–Al2O3–Na2O–TiO2 (BSANT) glass was proposed, where the effects of B2O3/SiO2 molar ratio (B/Si) and B2O3 content on viscosity and structure were investigated. The results showed that the BSANT glass viscosity was gradually decreased, and the viscous activation energy was decreased by 20.24% with an increased B/Si ratio from 0.415 to 0.719. This was attributed to the decreased amounts of Q3, [BO4], [AlO4], and bridging oxygen (BO) in the network structure, which in turn resulted in a decreased network degree of polymerization. When B2O3 content was increased from 18.70 to 33.12 mol.%, the melt viscosity value at 950 ℃ was decreased by 64.51%, and the viscous activation energy was reduced by 15.82%. Boron anomalies were also observed in glass melts with the B2O3 content from 28.28 to 33.12 mol.%. The mechanisms responsible for this phenomenon were thoroughly discussed in the study. Additionally, a comparison and discussion of the applications of glass lubricants in metal hot working were presented. A glass lubricant with a specific composition was recommended for use in hot extrusion process within the temperature range of 950–1100°C due to its relatively stable viscosity properties.

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Section: Effects Of B 2 O 3 /Sio 2 Molar Ratio and B 2 O 3 Content On...mentioning

confidence: 96%

Section: Effects Of B 2 O 3 /Sio 2 Molar Ratio and B 2 O 3 Content On...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of B₂O₃/SiO₂ molar ratio and B₂O₃ content on viscosity and structure of B₂O₃–SiO₂–Al₂O₃–Na₂O–TiO₂ glass lubricant

Cui,

Lv,

et al. 2024

J Am Ceram Soc.

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“…In addition, increasing the content of CaO can improve the viscosity of slag. The properties of MgO are similar to CaO, and it can also improve fluidity by reducing the viscosity of the slag [ 8 , 9 ]. Al 2 O 3 is a representative amphoteric oxide, and there are obvious differences in its properties in different contents.…”

Section: Introductionmentioning

confidence: 99%

Developments in Atomistic and Nano Structure Evolution Mechanisms of Molten Slag Using Atomistic Simulation Methods

Jiang,

Li,

et al. 2024

Nanomaterials

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Molten slag has different properties depending on its composition. The relationship between its composition, structure, and properties has been the focus of attention in industrial manufacturing processes. This review describes the atomistic scale mechanisms by which oxides of different compositions affect the properties and structure of slag, and depicts the current state of research in the atomic simulation of molten slag. At present, the research on the macroscopic properties of molten slag mainly focuses on viscosity, free-running temperature, melting point, and desulphurization capacity. Regulating the composition has become the most direct and effective way to control slag properties. Analysis of the microevolution mechanism is the fundamental way to grasp the macroscopic properties. The microstructural evolution mechanism, especially at the atomic and nanoscale of molten slag, is reviewed from three aspects: basic oxides, acidic oxides, and amphoteric oxides. The evolution of macroscopic properties is analyzed in depth through the evolution of the atomic structure. Resolution of the macroscopic properties of molten slag by the atomic structure plays a crucial role in the development of fundamental theories of physicochemistry.

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An Insight in the Viscosity–Temperature Property of CaO‐SiO₂‐Al₂O₃‐Based Slag Systems from Melt Structure

Zhang,

He,

Zhang

et al. 2024

steel research int.

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Viscosity is an important property for CaO‐SiO2‐Al2O3‐based slag systems, which showcases different scenarios in basic and acid slag systems with temperature change. This article elucidates the mechanism of their difference in viscosity–temperature property from melt structure. Results reveal that basic slag shows a low degree of polymerization (DOP) and a low viscosity of the melt due to an excessive O2− ions depolymerizing the complex network structures, resulting in more low‐polymerized Q0(Si) units and less high‐polymerized Q3(Si) units. With the temperature decreases, the DOP and viscosity do not change significantly. However, the low DOP and viscosity favor crystal precipitation in the melt, leading to a solid–liquid mixed state of the slag, and thus a sharp increase in viscosity when the temperature decreases to 1275 °C. For acid slag, it undergoes a transformation into aluminosilicate structures with the introduction of numerous [AlO4]5− tetrahedra, accompanied by a significant increase in the relative mole fraction of high‐polymerized Q3(Si) units. Consequently, the DOP and viscosity are obviously higher than that of the basic slag. Furthermore, the DOP and viscosity of the acid slag increase continuously with the temperature decreasing, thus impeding crystal precipitation and enhancing the glass transition tendency of the molten slag.

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Investigation of viscosity and structure of CaO-SiO2-MgO-Al2O3-BaO-B2O3 slag melt

Cited by 25 publications

References 34 publications

Effect of B₂O₃/SiO₂ molar ratio and B₂O₃ content on viscosity and structure of B₂O₃–SiO₂–Al₂O₃–Na₂O–TiO₂ glass lubricant

Effect of B₂O₃/SiO₂ molar ratio and B₂O₃ content on viscosity and structure of B₂O₃–SiO₂–Al₂O₃–Na₂O–TiO₂ glass lubricant

Developments in Atomistic and Nano Structure Evolution Mechanisms of Molten Slag Using Atomistic Simulation Methods

An Insight in the Viscosity–Temperature Property of CaO‐SiO₂‐Al₂O₃‐Based Slag Systems from Melt Structure

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Investigation of viscosity and structure of CaO-SiO2-MgO-Al2O3-BaO-B2O3 slag melt

Cited by 25 publications

References 34 publications

Effect of B2O3/SiO2 molar ratio and B2O3 content on viscosity and structure of B2O3–SiO2–Al2O3–Na2O–TiO2 glass lubricant

Effect of B2O3/SiO2 molar ratio and B2O3 content on viscosity and structure of B2O3–SiO2–Al2O3–Na2O–TiO2 glass lubricant

Developments in Atomistic and Nano Structure Evolution Mechanisms of Molten Slag Using Atomistic Simulation Methods

An Insight in the Viscosity–Temperature Property of CaO‐SiO2‐Al2O3‐Based Slag Systems from Melt Structure

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Product

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Effect of B₂O₃/SiO₂ molar ratio and B₂O₃ content on viscosity and structure of B₂O₃–SiO₂–Al₂O₃–Na₂O–TiO₂ glass lubricant

Effect of B₂O₃/SiO₂ molar ratio and B₂O₃ content on viscosity and structure of B₂O₃–SiO₂–Al₂O₃–Na₂O–TiO₂ glass lubricant

An Insight in the Viscosity–Temperature Property of CaO‐SiO₂‐Al₂O₃‐Based Slag Systems from Melt Structure