Interfacial reaction between Al₂O₃–C refractory and Al killed steel

Abstract

In the current investigation, the thin film method was employed to clarify the formation mechanism of inclusions at the interface between refractory and liquid Fe. According to the electron probe microanalysis (EPMA) mapping of the interface, a Si peak corresponding to SiO 2 was significant at the interface between the refractory and Fe and a small amount of Fe oxide existed. A reacted layer was formed in a way that initially FeO enriched liquid layer was widely distributed on the Fe surface and FeO and SiO 2 in the liquid layer were reduced by Al in liquid Fe to develop solid Al 2 O 3 enriched layer of inclusions. Some inclusions in the liquid Fe might be produced by the remaining oxygen in Ar gas which was supplied through the nozzle to prevent the adherence of inclusions onto it. Thermodynamic prediction was carried out to confirm if the oxygen partial pressure with increasing the oxygen activity on Fe surface could closely be related to the formation of reacted layer.

Functionalized Carbon‐Bonded Filters with an Open Porous Alumina Coating: Impact of Time on Interactions and Steel Cleanliness

“…Non-metallic inclusions deposited from the melt altered the composition of that slag film and the reactive zone. Also Lee et al [12] described the FeO formation as starting point for their interfacial reactions between carbonbonded alumina refractory and an Al killed steel. According to them, SiO 2 and FeO in that initial layer were reduced by Al, which was dissolved in molten steel, leading to the formation of hercynite and finally in alumina.…”

“…To diminish clogging, several studies have focused on the origin, formation, and growth of non-metallic inclusions in Al-killed steel on the one hand, as well as on the interactions of Alkilled steel and carbon-bonded alumina refractories. [1,[12][13][14][15][16][17] For steel melt filtration, however, the time factor of these interactions is essential. To the authors' knowledge, such tests have been carried out by Storti et al [18] only in form of shorttime immersion tests (10 s and 30 s) of multi-walled carbon nanotubes coated Al 2 O 3 -C filters.…”