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Effect of Al 2 O 3 and MgO on Interfacial Tension Between Calcium Silicate‐Based Melts and a Solid Steel Substrate
Author(s) -
Jung Eun Jin,
Min Dong Joon
Publication year - 2012
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201200023
Subject(s) - slag (welding) , surface tension , materials science , x ray photoelectron spectroscopy , silicate , depolymerization , fourier transform infrared spectroscopy , oxygen , metallurgy , analytical chemistry (journal) , chemical engineering , chemistry , thermodynamics , polymer chemistry , organic chemistry , engineering , chromatography , physics
The effect of Al 2 O 3 and MgO on the interfacial tension between the molten CaO–SiO 2 ‐based slag and solid steel at 1773 K was studied. The interfacial tension of molten slags slightly increased with increasing Al 2 O 3 , but no significant change of interfacial tension was observed with higher MgO. Fourier transform infrared (FTIR) of as‐quenched slag samples indicated the slag structure to polymerize with Al 2 O 3 additions, but depolymerize with MgO additions. Further detailed studies of the slag surface using X‐ray photoelectron spectroscopy (XPS) showed the fraction of free oxygen ions to decrease with higher Al 2 O 3 but remained constant at higher MgO. The results suggested that interfacial tension decreases not only with the depolymerization of the melt, but also with an increase in the free oxygen ions at the molten slag/solid steel interface.