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Metallurgical and Materials Transactions B
Erschienen in: Metallurgical and Materials Transactions B 1/2017

19.09.2016

Effects of CaO/SiO2 Ratio and Na2O Content on Melting Properties and Viscosity of SiO2-CaO-Al2O3-B2O3-Na2O Mold Fluxes

verfasst von: Lin Wang, Chen Zhang, Dexiang Cai, Jianqiang Zhang, Yasushi Sasaki, Oleg Ostrovski

Erschienen in: Metallurgical and Materials Transactions B | Ausgabe 1/2017

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Abstract

This paper investigated the effects of CaO/SiO2 ratio (0.8 to 1.5) and Na2O concentration (6 to 9 wt pct) on melting properties and viscosity of SiO2-CaO-Al2O3-B2O3-Na2O mold fluxes with a fixed B2O3 content. Melting properties of fluxes (softening temperature T s, hemispherical temperature T h, and fluidity temperature T f) were determined by the hot-stage microscopy method. Viscosity was measured using rotating cylindrical viscometer, and structure of quenched fluxes was studied using Raman spectroscopy. Equilibrium phases in the SiO2-CaO-Al2O3-B2O3-Na2O system were calculated using FactSage. It was found that T h decreased with increasing CaO/SiO2 ratio from 0.8 to 1.0 and increased with a further increase in the CaO/SiO2 ratio to 1.5. The effect of Na2O content in the range of 6 to 9 wt pct on T h of the flux with a fixed CaO/SiO2 ratio at 1.3 was marginal. Increasing CaO/SiO2 ratio and Na2O content increased the break temperature and reduced the value of viscosity at 1673 K (1400 °C). Viscosity of liquid fluxes was discussed in the relationship with the flux structure. Melting properties and viscosity of boracic fluxes were compared with those of industrial fluorine-containing mold fluxes.
Vorheriger Artikel Reactions Between Liquid CaO-SiO2 Slags and Graphite Substrates
Nächster Artikel Investigation on Viscosity and Nonisothermal Crystallization Behavior of P-Bearing Steelmaking Slags with Varying TiO2 Content

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Metadaten
Titel
Effects of CaO/SiO2 Ratio and Na2O Content on Melting Properties and Viscosity of SiO2-CaO-Al2O3-B2O3-Na2O Mold Fluxes
verfasst von
Lin Wang
Chen Zhang
Dexiang Cai
Jianqiang Zhang
Yasushi Sasaki
Oleg Ostrovski
Publikationsdatum
19.09.2016
Verlag
Springer US
Erschienen in
Metallurgical and Materials Transactions B / Ausgabe 1/2017
Print ISSN: 1073-5615
Elektronische ISSN: 1543-1916
DOI
https://doi.org/10.1007/s11663-016-0816-5

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