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Effects of B 2 O 3 and Ti O 2 on Crystallization Behavior of Slags in Al 2 O 3 – C a O – M g O – N a 2 O – S i O 2 System
Author(s) -
Shu Qifeng,
Wang Zhen,
Klug Jeferson L.,
Chou Kuochih,
Scheller Piotr R.
Publication year - 2013
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.201200341
Subject(s) - crystallization , liquidus , materials science , slag (welding) , gehlenite , differential thermal analysis , titanium , wollastonite , mineralogy , fluoride , oxide , crystal (programming language) , metallurgy , analytical chemistry (journal) , perovskite (structure) , chemical engineering , diffraction , inorganic chemistry , phase (matter) , chemistry , raw material , physics , organic chemistry , alloy , optics , chromatography , computer science , engineering , programming language
Nowadays, there are increasing demands for developing mould fluxes without fluoride due to environmental concerns. Slag bearing titanium oxide and/or boron oxide proved to be promising substitute for traditional mould fluxes with fluoride. In the present work, Crystallization behaviors of some slags in Al 2 O 3 –CaO–MgO–Na 2 O–SiO 2 –B 2 O 3 –TiO 2 system were investigated using single hot thermocouple technique (SHTT), differential thermal analysis (DTA), and X‐ray diffraction (XRD) technique. It was found that liquidus temperature of slag decreases with increases of B 2 O 3 content. The XRD analysis on the crystallized samples shows that crystallization products are perovskite, gehlenite, and wollastonite. Time–temperature–transformation diagrams (TTT) for various slags have been constructed using SHTT technique. It was found that B 2 O 3 can significantly increase the incubation time for crystallization of slags. Incubation time for crystallization of slags at nose temperature decreases with increase of titanium oxide content from 5% to 10%. The morphology of crystals was also investigated using SHTT technique. At higher temperature, dendrites and columnar crystal tend to form and grow with time progress, while at lower temperature, small crystals appear and the amount of crystal increase with time increasing.