Metallurgical and Materials Transactions B

, Volume 48, Issue 1, pp 516–526 | Cite as

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

  • Lin Wang
  • Chen Zhang
  • Dexiang Cai
  • Jianqiang Zhang
  • Yasushi Sasaki
  • Oleg Ostrovski
Article
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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.

Keywords

B2O3 Na2O Mold Flux Inductively Couple Plasma Atomic Emission Spectroscopy Na2O Content 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Notes

Acknowledgments

This project was financially supported by Baosteel through BAJC, Abel Metal, and Australian Research Council (ARC LP130100773).

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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2016

Authors and Affiliations

  • Lin Wang
    • 1
  • Chen Zhang
    • 2
  • Dexiang Cai
    • 2
  • Jianqiang Zhang
    • 1
  • Yasushi Sasaki
    • 1
  • Oleg Ostrovski
    • 1
  1. 1.School of Materials Science and EngineeringUNSW AustraliaSydneyAustralia
  2. 2.Steelmaking Research DepartmentBaosteel Group Corporation Research InstituteShanghaiChina

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