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

Sung Hoon Chung, Il Sohn

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1 Citation (Scopus)

Abstract

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.

Original languageEnglish
Pages (from-to)991-999
Number of pages9
JournalMetallurgical and Materials Transactions B: Process Metallurgy and Materials Processing Science
Volume50
Issue number2
DOIs
Publication statusPublished - 2019 Apr 15

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Mechanics of Materials
  • Metals and Alloys
  • Materials Chemistry

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