X-RAY DIFFRACTION AND SEM/EDX STUDIES ON TECHNOLOGICAL EVOLUTION OF THE OXIDE-FLUORIDE CERAMIC FLUX FOR SUBMERGED ARC-SURFACING
2012
The ceramic flux for submerged arc-surfacing with main component composition
MgO (10.0 wt. %)-Al2O3 (25.0 wt. %)-SiO2 (40.0 wt. %)-CaF2 (25.0 wt. %) was
prepared in a disk dryer-granulator using a sodium/potassium silicate
solution as a binder. X-ray powder diffraction (XRPD) collected at r.t.
identified α- phase of quartz, Al2O3, MgO and CaF2 of the initial components
in the samples taken after granulation and subsequent annealing at 600 °C. In
contrast to the low temperature annealing, anorthite (CaAl2Si2O8) is the main
phase in the composition of the samples remelted at 1500 °C and quenched
subsequently. Chemical analysis performed by means of scanning electron
microscopy with energy-dispersive X-ray spectroscopy analysis (SEM/EDX)
detects that the grains of the remelted samples possess the same Ca : Al : Si
elemental ratio as anorthite. High temperature X-ray diffraction (HTXRD) was
used to examine structural transformation in the solid at 600 °C < T < 1200
°C and stages of thermal evolution of ceramic flux were determined. The
ceramic flux melts completely at the temperature above 1350 °C. The intensity
pattern of the flux melt was obtained by X-ray diffraction of scattered
X-rays at 1450 °C. After calculating the structure factor (SF), the radial
distribution function (RDF) was evaluated and used to calculate the
structural basicity of the flux melt.
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