Fundamentals of Hydrogen Solubility in Calcium-Alumino-Silicate Molten Fluxes Containing NaF

  • Sung Hoon Chung
  • Il SohnEmail author


The effect of the NaF and CaO/SiO2 ratio (mass percentage ratio) on hydrogen solubility in a CaO-SiO2-Al2O3-NaF system was studied and correlated to the structural units of the molten flux. Fourier transformed infrared, Raman, and X-ray photoelectron spectroscopy analyses were used to evaluate the structural units with NaF additions and various CaO/SiO2 ratios. At a CaO/SiO2 ratio of 0.8, the incorporated-hydroxyl dissolution mechanism is dominant, whereas the free-hydroxyl mechanism is pronounced at higher CaO/SiO2 ratio. At low NaF contents, the hydrogen solubility as a function of the CaO/SiO2 ratio showed a parabolic trend with a minimum typical of a change from incorporated- to a free-hydroxyl dissolution mechanism. The addition of network-modifying NaF depolymerizes the structural units of the flux, reducing the available sites for incorporated-hydroxyl groups. The hydrogen solubility behavior in the flux system correlates well with the structural analysis, where a high NaF content and CaO/SiO2 ratio are shown to depolymerize the complex structural units of the molten flux.



This work was supported by the Brain Korea 21 Plus Project and the Ministry of Trade, Industry & Energy (No. 10052751).


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Copyright information

© The Minerals, Metals & Materials Society and ASM International 2019

Authors and Affiliations

  1. 1.Materials Science and Engineering DepartmentYonsei UniversitySeoulSouth Korea

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