Novel Method for Determining the Interfacial Properties of Melt Slags Based on Single Hot Thermocouple Technique

Wang, Zhe; Wen, Guangrui; Tang, Ping; Hou, Zibing; Gu, Sijia

doi:10.2355/isijinternational.isijint-2019-111

Cited by 4 publications

(2 citation statements)

References 33 publications

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“…[15,16] In addition, fluorides play an important role in controlling horizontal heat transfer by facilitating the precipitation of 3CaO•2SiO 2 •CaF 2 . [17][18][19] Interestingly, due to the different types of fluorine raw materials, the mold powders with identical chemical compositions could have different heat control effects. Previous studies have investigated the environmental pollution of fluoride gas during mold powder melting.…”

Section: Introductionmentioning

confidence: 99%

Effects of Fluorides on NaF Vaporization during Mold Powder Melting by Thermodynamic Equilibrium Calculation

Li,

Wen,

Tang

et al. 2024

steel research int.

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Low‐basicity fluorine‐containing mold powder, which forms a porous slag film with NaF pores, is expected to solve the contradiction between heat transfer and lubrication during the continuous casting of peritectic steel. Herein, to study the influences of different fluorine raw materials (NaF, CaF2, and Na3AlF6) on NaF vaporization, thermodynamic calculations are carried out by FactSage 8.1 during mold powder melting from 600 to 1600 °C. The results show that CaF2 is the first producing NaF gas, followed by Na3AlF6 and then NaF as the temperature increases. With the same mass of fluorine addition, NaF produces the highest amount of NaF(g), followed by Na3AlF6 and CaF2. Furthermore, the effects of basicity (%CaO/%SiO2) and Al2O3 contents on NaF vaporization are investigated. Additionally, different fluorine raw materials and Al2O3 components that can form porous slag films at low basicity (from 0.7 to 1.1) are also obtained. Therefore, this work can be used to guide mold powder design for peritectic steel.

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Section: Introductionmentioning

confidence: 99%

Effects of Fluorides on NaF Vaporization during Mold Powder Melting by Thermodynamic Equilibrium Calculation

Li,

Wen,

Tang

et al. 2024

steel research int.

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“…Nevertheless, studies undertaken so far provide contradictory evidence concerning the roles of CaF 2 in flux/slag structure. [13][14][15][16][17] The addition of CaF 2 to silicate glasses is reported to lead to the depolymerization of silicate networks owing to the abundant presence of Si-F bonds, [13,14] while CaF 2 is also found to act as a diluent and not contribute to the breakage of Si-O-Si bonds. [15,16] On the other hand, it has been proven that MnO acts as a network modifier and reduces fluxes viscosity, [11,18] so that it can be used to replace CaF 2 .…”

Section: ⅰ Introductionmentioning

confidence: 99%

Probing Viscosity and Structural Variations in CaF2–SiO2–MnO Welding Fluxes

Zhang

Wang

Zhang

et al. 2022

Metall Mater Trans B

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Recent demand on welding fluxes for high-strength low-alloy steel grades has necessitated the development of CaF 2 -free fluxes towards high heat input applications. To meet such requirements, a flux design strategy has been postulated by varying MnO/(CaF 2 +MnO) mass ratio in the CaF 2 -SiO 2 -MnO flux system. The effect of MnO substitution for CaF 2 on the flux viscosity and structure has been investigated, and a quantitative relationship between viscosity and structural units has been put forward. In addition, it has been suggested that the degree of polymerization (DOP) of silicate network is reduced with increasing MnO/(CaF 2 +MnO) mass ratio, indicating MnO plays the role of network-breaker. The spectra of F 1s and 19 F prove that Fpredominantly bonds with Ca 2+ rather than Si 4+ , revealing CaF 2 acts as a diluent and does not effectively depolymerize the silicate network.Linear correlations can be obtained between the logarithm viscosity and the average non-bridging 2 oxygen per silicon atom (NBO/Si), which can potentially be used as a DOP index to quantify the impact of silicate structure on the viscosity of the flux.

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In-Situ Quantitative Study of Heat Transfer Performance of Mold Flux by Using Double Hot Thermocouple Technology

Wang

Wen

Jiang

et al. 2021

The Minerals, Metals &Amp; Materials Series

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Novel Method for Determining the Interfacial Properties of Melt Slags Based on Single Hot Thermocouple Technique

Cited by 4 publications

References 33 publications

Effects of Fluorides on NaF Vaporization during Mold Powder Melting by Thermodynamic Equilibrium Calculation

Effects of Fluorides on NaF Vaporization during Mold Powder Melting by Thermodynamic Equilibrium Calculation

Probing Viscosity and Structural Variations in CaF2–SiO2–MnO Welding Fluxes

In-Situ Quantitative Study of Heat Transfer Performance of Mold Flux by Using Double Hot Thermocouple Technology

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