ISIJ International
Online ISSN : 1347-5460
Print ISSN : 0915-1559
ISSN-L : 0915-1559
Regular Article
Effects of Agitation and Morphology of Primary Crystalline Phase on Crystallization Behavior of CaO–SiO2–CaF2 Supercooled Melts
Yusuke HaradaKakeru KusadaSohei SukenagaHideaki YamamuraYoshiyuki UeshimaToshiaki MizoguchiNoritaka SaitoKunihiko Nakashima
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2014 Volume 54 Issue 9 Pages 2071-2076

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Abstract

The effects of the agitation field and the crystal morphology on the primary and secondary crystallization temperatures of CaO–SiO2–CaF2 supercooled melts were systematically investigated by measuring the electrical capacitance.
Two-stage decreases in electrical capacitance were observed for most samples investigated. These stages correspond to the primary crystallization and the eutectic reaction resulting from the compositional change in the supercooled melts associated with the primary crystallization, respectively.
The primary crystallization of dendritic CaO·SiO2 was affected by the agitation in the same manner as reported previously, but the crystallization of faceted 3CaO·2SiO2·CaF2 revealed little dependence on the agitation. This indicates that the effects of the agitation are different for different morphologies of the primary crystalline phase because of shifts in the rate-determining step of crystallization.

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© 2014 by The Iron and Steel Institute of Japan
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