The form of the existence of Al in Fe–Sn melts with exogenous nanoparticles of refractory oxides

Resumo

Interaction of refractory phase nanoparticles (Al₂O₃) with a surfactant in Fe–Sn melt resulting in removal of the nanoparticle + Sn complexes to the Me–ceramic or Me–gas interface is investigated. Using the method of atomic emission spectrometry with inductively coupled plasma were developed new methods of quantitative determination of the different modes of occurrence of aluminum in iron alloys: Al, dissolved in metal and aluminum—in the form of corundum Al₂O₃. It is shown that, owing to adsorption interaction of Al₂O₃ particles with Sn, the part of Sn removed from the melt is 22.5%, while the part of Al₂O₃ nanoparticles removed in the form of Fe + (Al₂O₃ + Sn) complexes is 65%. Up to 98% of aluminum in the melt is found in the form of Al₂O₃ particles and the only ~2% is in the solution.