The effect of the NaF and CaO/SiO 2 ratio (mass percentage ratio) on hydrogen solubility in a CaO-SiO 2 -Al 2 O 3 -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/SiO 2 ratios. At a CaO/SiO 2 ratio of 0.8, the incorporated-hydroxyl dissolution mechanism is dominant, whereas the free-hydroxyl mechanism is pronounced at higher CaO/SiO 2 ratio. At low NaF contents, the hydrogen solubility as a function of the CaO/SiO 2 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/SiO 2 ratio are shown to depolymerize the complex structural units of the molten flux.
|Number of pages||9|
|Journal||Metallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science|
|Publication status||Published - 2019 Apr 15|
Bibliographical noteFunding Information:
This work was supported by the Brain Korea 21 Plus Project and the Ministry of Trade, Industry & Energy (No. 10052751).
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Mechanics of Materials
- Metals and Alloys
- Materials Chemistry