Stability of Cuspidine (3CaO・2SiO_2・CaF_2) and Phase Relations in the CaO-SiO_2-CaF_2 System

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Author(s)

    • WATANABE Takashi
    • Department of Chemistry and Materials Science, Tokyo Institute of Technology
    • FUKUYAMA Hiroyuki
    • Department of Chemistry and Materials Science, Tokyo Institute of Technology
    • NAGATA Kazuhiro
    • Department of Chemistry and Materials Science, Tokyo Institute of Technology

Abstract

Primary crystallization field of cuspidine (3CaO · 2SiO<sub>2</sub> · CaF<sub>2</sub> ) has been experimentally determined in the 2CaO · SiO<sub>2</sub>–SiO<sub>2</sub>–CaF<sub>2</sub> system by quenching method and differential thermal analysis (DTA). Hermetically closed platinum capsules were used as a sample container to prevent fluorine loss in the form of HF and SiF<sub>4</sub> by reaction of CaF<sub>2</sub> with moisture or SiO<sub>2</sub> for quenching experiments. Combining the present study with the partial phase diagrams previously reported, the whole phase diagram of the CaO–SiO<sub>2</sub>–CaF<sub>2</sub> system has been developed. Cuspidine equilibrates with (2CaO · SiO<sub>2</sub>)<sub>2</sub>CaF<sub>2</sub>, CaO · SiO<sub>2</sub>, 3CaO · 2SiO<sub>2</sub>, 2CaO · SiO<sub>2</sub> and CaF<sub>2</sub> in solid state. Cuspidine coexists with liquid phases at temperatures between 1 387 K and 1 680 K.

Journal

  • ISIJ International

    ISIJ International 42(5), 489-497, 2002-05-15

    The Iron and Steel Institute of Japan

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