Viscosity measurement of SiO2-Na2O melts with addition of NaF

Osamu Takeda; Tomoki Ohnishi; Yuzuru Sato

doi:10.2355/isijinternational.54.2045

Viscosity measurement of SiO₂-Na₂O melts with addition of NaF

Osamu Takeda, Tomoki Ohnishi, Yuzuru Sato

ENG - Metallurgy

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

The viscosity of SiO₂-Na₂O-NaF melts was measured by using a rotating crucible viscometer developed by the authors. The basicity (= C_Na2O/C_SiO2in mol%) of the melts was 0.67, 0.82, and 1.00. The concentrations of NaF were 5, 10, and 15 mol%. As a result, the viscosity of the melts showed a good Arrhenius type linearity in any melts. It was found that the sample loss occurred in highly basic composition region due to a prolonged measurement at high temperature. The viscosity of the melts decreased with increasing the concentration of NaF, and the composition dependence is similar to that for SiO₂-CaO-CaF₂melts. Viscosity decreasing ability of NaF is higher than that of Na₂O within the composition region investigated in this study. Transitions of activation energy of viscous flow are different between Na₂O addition and NaF addition. This implies that the mechanism of enhancement of fluidity is different between Na₂O and NaF.

Original language	English
Pages (from-to)	2045-2049
Number of pages	5
Journal	ISIJ International
Volume	54
Issue number	9
DOIs	https://doi.org/10.2355/isijinternational.54.2045
Publication status	Published - 2014

Keywords

Mold flux
Rotating crucible viscometer
SiO-NaO-NaF
Viscosity

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title = "Viscosity measurement of SiO2-Na2O melts with addition of NaF",

abstract = "The viscosity of SiO2-Na2O-NaF melts was measured by using a rotating crucible viscometer developed by the authors. The basicity (= CNa2O/CSiO2in mol%) of the melts was 0.67, 0.82, and 1.00. The concentrations of NaF were 5, 10, and 15 mol%. As a result, the viscosity of the melts showed a good Arrhenius type linearity in any melts. It was found that the sample loss occurred in highly basic composition region due to a prolonged measurement at high temperature. The viscosity of the melts decreased with increasing the concentration of NaF, and the composition dependence is similar to that for SiO2-CaO-CaF2melts. Viscosity decreasing ability of NaF is higher than that of Na2O within the composition region investigated in this study. Transitions of activation energy of viscous flow are different between Na2O addition and NaF addition. This implies that the mechanism of enhancement of fluidity is different between Na2O and NaF.",

keywords = "Mold flux, Rotating crucible viscometer, SiO-NaO-NaF, Viscosity",

author = "Osamu Takeda and Tomoki Ohnishi and Yuzuru Sato",

note = "Publisher Copyright: {\textcopyright} 2014 ISIJ.",

year = "2014",

doi = "10.2355/isijinternational.54.2045",

language = "English",

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pages = "2045--2049",

journal = "ISIJ International",

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TY - JOUR

T1 - Viscosity measurement of SiO2-Na2O melts with addition of NaF

AU - Takeda, Osamu

AU - Ohnishi, Tomoki

AU - Sato, Yuzuru

PY - 2014

Y1 - 2014

N2 - The viscosity of SiO2-Na2O-NaF melts was measured by using a rotating crucible viscometer developed by the authors. The basicity (= CNa2O/CSiO2in mol%) of the melts was 0.67, 0.82, and 1.00. The concentrations of NaF were 5, 10, and 15 mol%. As a result, the viscosity of the melts showed a good Arrhenius type linearity in any melts. It was found that the sample loss occurred in highly basic composition region due to a prolonged measurement at high temperature. The viscosity of the melts decreased with increasing the concentration of NaF, and the composition dependence is similar to that for SiO2-CaO-CaF2melts. Viscosity decreasing ability of NaF is higher than that of Na2O within the composition region investigated in this study. Transitions of activation energy of viscous flow are different between Na2O addition and NaF addition. This implies that the mechanism of enhancement of fluidity is different between Na2O and NaF.

AB - The viscosity of SiO2-Na2O-NaF melts was measured by using a rotating crucible viscometer developed by the authors. The basicity (= CNa2O/CSiO2in mol%) of the melts was 0.67, 0.82, and 1.00. The concentrations of NaF were 5, 10, and 15 mol%. As a result, the viscosity of the melts showed a good Arrhenius type linearity in any melts. It was found that the sample loss occurred in highly basic composition region due to a prolonged measurement at high temperature. The viscosity of the melts decreased with increasing the concentration of NaF, and the composition dependence is similar to that for SiO2-CaO-CaF2melts. Viscosity decreasing ability of NaF is higher than that of Na2O within the composition region investigated in this study. Transitions of activation energy of viscous flow are different between Na2O addition and NaF addition. This implies that the mechanism of enhancement of fluidity is different between Na2O and NaF.

KW - Mold flux

KW - Rotating crucible viscometer

KW - SiO-NaO-NaF

KW - Viscosity

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DO - 10.2355/isijinternational.54.2045

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EP - 2049

JO - ISIJ International

JF - ISIJ International

IS - 9

ER -

Viscosity measurement of SiO₂-Na₂O melts with addition of NaF

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Keywords

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