Effect of agitation on crystallization behavior of CaO-SiO 2 -R 2 O (R = Li, Na, or K) system characterized by electrical capacitance measurement

Noritaka Saito, Kakeru Kusada, Sohei Sukenaga, Yoshio Ohta, Kunihiko Nakashima

Research output: Contribution to journalArticle

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Abstract

The effect of agitation on the crystallization behavior of molten 50CaO-50SiO 2 and 45CaO-45SiO 2 - 10R 2 O (R = Li, Na, or K, mol%) fluxes were systematically investigated by the measurement of their electrical capacitance over a wide temperature range from liquid region to well below the liquidus temperature. It is well known that the electrical capacitance of liquids is generally much higher than that of solids owing to the differences in their respective polarization mechanisms. These differences were exploited as a sensitive indicator of the crystallization of molten calcium silicates in an experimental furnace equipped with an electrical capacitance measuring system. The system comprised a Pt-based alloy crucible and a rotating rod that allowed evaluation of the effect of agitation generated by the rod, connected to a capacitance meter (LCR meter). As expected, at a particular temperature, the electrical capacitance of the molten calcium silicates underwent a precipitous decrease by roughly three orders of magnitude, which was dependent on the chemical composition. This indicated the presence of crystallization and this was confirmed by corresponding microstructural characterization. It was also found that, for the measurements acquired with rotating rod agitation, the temperatures at which the capacitance underwent the sharp decrease were higher than that identified without the agitation. This suggests that the agitation effect induced by the rotating rod accelerates the crystallization of molten calcium silicates.

Original languageEnglish
Pages (from-to)2123-2129
Number of pages7
Journalisij international
Volume52
Issue number12
DOIs
Publication statusPublished - Dec 1 2012

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Capacitance measurement
Crystallization
Capacitance
Calcium silicate
Molten materials
Temperature
Crucibles
Liquids
Furnaces
Polarization
Fluxes
Chemical analysis
calcium silicate

All Science Journal Classification (ASJC) codes

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Cite this

Effect of agitation on crystallization behavior of CaO-SiO 2 -R 2 O (R = Li, Na, or K) system characterized by electrical capacitance measurement . / Saito, Noritaka; Kusada, Kakeru; Sukenaga, Sohei; Ohta, Yoshio; Nakashima, Kunihiko.

In: isij international, Vol. 52, No. 12, 01.12.2012, p. 2123-2129.

Research output: Contribution to journalArticle

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