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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

X-ray diffraction and SEM/EDX studies on technological evolution of the oxide-fluoride ceramic flux for submerged arc-surfacing