2014-Sustainable Industrial Processing Summit
SIPS 2014 Volume 3: Non-ferrous & Iron_Steel
| Editors: | Kongoli F |
| Publisher: | Flogen Star OUTREACH |
| Publication Year: | 2014 |
| Pages: | 522 pages |
| ISBN: | 978-1-987820-05-8 |
| ISSN: | 2291-1227 (Metals and Materials Processing in a Clean Environment Series) |
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Structure and Viscosity Relationship in the B2O3-containing Calcium-Aluminate Based Fluxes
Gi Hyun Kim1; Il Sohn1;1YONSEI UNIVERSITY MATERIALS SCIENCE AND ENGINEERING, Seoul, Korea (Republic of [South] Korea);
Type of Paper: Regular
Id Paper: 382
Topic: 4
Abstract:
With the advent of high-Al containing steel products, significant work is being done on calcium-aluminate based fluxes for continuous casting. The new breeds of calcium-aluminate based fluxes containing B2O3 are expected to be possible alternatives to the highly reactive calcium-silicate based fluxes currently used for typical carbon steels. To provide fundamental understanding of the impact of B2O3 additions, this study focused on the effect of B2O3 on the viscosity and structure of the flux with 12wt% Na2O. Higher B2O3 concentrations in the quaternary flux system lowered the viscosity at fixed CaO/Al2O3. When increasing the CaO/Al2O3 at fixed B2O3, lower viscosity was measured. By correlating the viscosity with the as-quenched flux structure from 1773 K, spectroscopic analysis using FTIR (Fourier transformed infra-red) and Raman verified the existence of the alumino-borate structures with Al-O tetrahedral units, B-O triangular and tetrahedral units. Higher B2O3 lowered the Al-O network structures transforming the 3-D network structures into 2-D network structures by depolymerizing bridged oxygen ions (O0) to non-bridged oxygen ions (O-) resulting also in lower viscosity. Higher CaO/Al2O3 had similar effects to the addition of B2O3, where the 3-D complex network became simpler.