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Structural Behavior of Al 3+ in Mould Flux Glasses of CaO–SiO 2 –Al 2 O 3 –Na 2 O–CaF 2 System
Author(s) -
Min Yi,
Zhong Ming,
Huang Jian,
Liu Chengjun,
Jiang Maofa
Publication year - 2014
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.201300291
Subject(s) - flux (metallurgy) , materials science , analytical chemistry (journal) , degree of polymerization , raman spectroscopy , mole fraction , polymerization , glass transition , chemical composition , casting , base (topology) , crystallography , mineralogy , metallurgy , chemistry , composite material , chromatography , mathematical analysis , physics , mathematics , organic chemistry , optics , polymer
Quenched glass samples of CaO–SiO 2 –Al 2 O 3 –Na 2 O–CaF 2 system were prepared within the composition of continuous casting mould flux, and the chemical composition and Raman spectra were detected subsequently. The degree of polymerization and structural behavior of Al 3+ were investigated on the base of the quantitative calculation of structure species. The experimental data showed that the dominant structure species are Q i ( i = 0, 1, 2) of the Si–O tetrahedrons in the liquid mould flux, and the degree of polymerization decreases with the increasement of basicity and the decreasement of Al 2 O 3 content. Al–O tetrahedrons and Al 3+ cations coexist in the liquid mould flux, and the mole fraction of Al–O tetrahedrons increases with the increasement of basicity and Al 2 O 3 content. Under the condition of the mole ratio Al/(Al + Si) < 0.19, the structural behavior of Al 3+ is stable in the liquid mould flux. Considering the variation of mould flux composition during Al‐killed steel continuous casting process, the initial content of Al 2 O 3 and SiO 2 in the mould flux should be controlled appropriately according to the transition point Al/(Al + Si).