Journal
ISIJ INTERNATIONAL
Volume 53, Issue 1, Pages 170-176Publisher
IRON STEEL INST JAPAN KEIDANREN KAIKAN
DOI: 10.2355/isijinternational.53.170
Keywords
Al2O3; CaO/(SiO2+Al2O3); viscosity; FTIR; Raman; alumino-silicate structures
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Funding
- Brain Korea 21 (BK21) Project at the Division of the Humantronics Information Materials
- National Science Foundation of Korea [2012-8-0486]
- National Research Foundation of Korea [2010-0007442] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The substitutional effect of SiO2 with Al2O3 content on the viscosity in the calcium-silicate melt-based system containing 12 mass% Na2O and 5 mass% Li2O was studied. Additions of Al2O3 increased the viscosity and higher Al2O3 concentrations modified the dominant silicate network into complex alumino-silicates with the aluminate structure becoming particularly prevalent at an Al2O3 content of 20 mass% and higher. FTIR (Fourier transform infra red) and Raman analysis showed increased amounts of symmetric Al-O-0 and Si-O-Al stretching vibrations with higher Al2O3. Compared to the effect of Al2O3, structural changes and the viscosity with higher CaO/(SiO2+Al2O3) were not as significant. However, the symmetric Al-O-0 stretching and the Si-O-Al in the [AlO4](5-)-tetrahedral units seems to decrease with increased apparent basicity. The apparent activation energy for viscous flow increased with higher Al2O3 due to the increased polymerization of the melt and varied from 129 to 156 kJ/mol.
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