Effect of fluorspar and alumina on the viscous flow of calcium silicate melts containing MgO

Joo Hyun Park; Dong Joon Min

doi:10.1016/j.jnoncrysol.2004.03.109

Effect of fluorspar and alumina on the viscous flow of calcium silicate melts containing MgO

Joo Hyun Park, Dong Joon Min

Department of Materials Science and Engineering

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31 Citations (Scopus)

Abstract

For the investigation of the effect of fluorspar and alumina on the viscous flow and the crystallization behavior of the silicate melts, the viscosity of the CaO-SiO₂-10 wt%MgO-CaF₂ (or -Al₂O ₃) system was measured. The addition of CaF₂ decreased the crystallization temperature (T_CR) of the CaO-SiO₂-MgO- CaF₂ system, while the T_CR of the CaO-SiO ₂-MgO-Al₂O₃ (wt%CaO/wt%SiO₂ = 1.0) system exhibited a minimum value at 10 wt% Al₂O₃. The activation energy was decreased in the CSMF system and vice versa in the CSMA system by addition of CaF₂ or Al₂O₃ in each system. From the relationship between the activation energy and the composition of the glasses, the following equation could be obtained. E(kJ/mol) = 293.2-90.9B^total, where the B^total is the ratio of (wt%CaO+wt%CaF₂+wt%MgO)/(wt%SiO₂+wt%Al₂O ₃). This means that CaO, CaF₂, and MgO would behave as a network modifier, while SiO₂ and Al₂O₃ behave as a network former in the glasses investigated.

Original language	English
Pages (from-to)	150-156
Number of pages	7
Journal	Journal of Non-Crystalline Solids
Volume	337
Issue number	2
DOIs	https://doi.org/10.1016/j.jnoncrysol.2004.03.109
Publication status	Published - 2004 Jul 1

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Materials Chemistry

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10.1016/j.jnoncrysol.2004.03.109

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title = "Effect of fluorspar and alumina on the viscous flow of calcium silicate melts containing MgO",

abstract = "For the investigation of the effect of fluorspar and alumina on the viscous flow and the crystallization behavior of the silicate melts, the viscosity of the CaO-SiO2-10 wt%MgO-CaF2 (or -Al2O 3) system was measured. The addition of CaF2 decreased the crystallization temperature (TCR) of the CaO-SiO2-MgO- CaF2 system, while the TCR of the CaO-SiO 2-MgO-Al2O3 (wt%CaO/wt%SiO2 = 1.0) system exhibited a minimum value at 10 wt% Al2O3. The activation energy was decreased in the CSMF system and vice versa in the CSMA system by addition of CaF2 or Al2O3 in each system. From the relationship between the activation energy and the composition of the glasses, the following equation could be obtained. E(kJ/mol) = 293.2-90.9Btotal, where the Btotal is the ratio of (wt%CaO+wt%CaF2+wt%MgO)/(wt%SiO2+wt%Al2O 3). This means that CaO, CaF2, and MgO would behave as a network modifier, while SiO2 and Al2O3 behave as a network former in the glasses investigated.",

author = "Park, {Joo Hyun} and Min, {Dong Joon}",

year = "2004",

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doi = "10.1016/j.jnoncrysol.2004.03.109",

language = "English",

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AU - Min, Dong Joon

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N2 - For the investigation of the effect of fluorspar and alumina on the viscous flow and the crystallization behavior of the silicate melts, the viscosity of the CaO-SiO2-10 wt%MgO-CaF2 (or -Al2O 3) system was measured. The addition of CaF2 decreased the crystallization temperature (TCR) of the CaO-SiO2-MgO- CaF2 system, while the TCR of the CaO-SiO 2-MgO-Al2O3 (wt%CaO/wt%SiO2 = 1.0) system exhibited a minimum value at 10 wt% Al2O3. The activation energy was decreased in the CSMF system and vice versa in the CSMA system by addition of CaF2 or Al2O3 in each system. From the relationship between the activation energy and the composition of the glasses, the following equation could be obtained. E(kJ/mol) = 293.2-90.9Btotal, where the Btotal is the ratio of (wt%CaO+wt%CaF2+wt%MgO)/(wt%SiO2+wt%Al2O 3). This means that CaO, CaF2, and MgO would behave as a network modifier, while SiO2 and Al2O3 behave as a network former in the glasses investigated.

AB - For the investigation of the effect of fluorspar and alumina on the viscous flow and the crystallization behavior of the silicate melts, the viscosity of the CaO-SiO2-10 wt%MgO-CaF2 (or -Al2O 3) system was measured. The addition of CaF2 decreased the crystallization temperature (TCR) of the CaO-SiO2-MgO- CaF2 system, while the TCR of the CaO-SiO 2-MgO-Al2O3 (wt%CaO/wt%SiO2 = 1.0) system exhibited a minimum value at 10 wt% Al2O3. The activation energy was decreased in the CSMF system and vice versa in the CSMA system by addition of CaF2 or Al2O3 in each system. From the relationship between the activation energy and the composition of the glasses, the following equation could be obtained. E(kJ/mol) = 293.2-90.9Btotal, where the Btotal is the ratio of (wt%CaO+wt%CaF2+wt%MgO)/(wt%SiO2+wt%Al2O 3). This means that CaO, CaF2, and MgO would behave as a network modifier, while SiO2 and Al2O3 behave as a network former in the glasses investigated.

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Effect of fluorspar and alumina on the viscous flow of calcium silicate melts containing MgO

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