Abstract
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.
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