Stability of cuspidine (3CaO·2SiO2·CaF2) and phase relations in the CaO-SiO2-CaF2 system

Takashi Watanabe; Hiroyuki Fukuyama; Kazuhiro Nagata

doi:10.2355/isijinternational.42.489

Stability of cuspidine (3CaO·2SiO₂·CaF₂) and phase relations in the CaO-SiO₂-CaF₂ system

Takashi Watanabe, Hiroyuki Fukuyama, Kazuhiro Nagata

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

72 Citations (Scopus)

Abstract

Primary crystallization field of cuspidine (3CaO·2SiO₂·CaF₂) has been experimentally determined in the 2CaO·SiO₂-SiO₂-CaF₂ 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 SiF₄ by reaction of CaF₂ with moisture or SiO₂ for quenching experiments. Combining the present study with the partial phase diagrams previously reported, the whole phase diagram of the CaO-SiO₂-CaF₂ system has been developed. Cuspidine equilibrates with (2CaO·SiO₂)₂CaF₂, CaO·SiO₂, 3CaO·2SiO₂, 2CaO·SiO₂ and CaF₂ in solid state. Cuspidine coexists with liquid phases at temperatures between 1387 K and 1680 K.

Original language	English
Pages (from-to)	489-497
Number of pages	9
Journal	Isij International
Volume	42
Issue number	5
DOIs	https://doi.org/10.2355/isijinternational.42.489
Publication status	Published - 2002
Externally published	Yes

Keywords

CaSiOF
CaSiOF
CaO-SiO -CaF
Cuspidine
Mold powder
Phase diagram
Phase equilibria

ASJC Scopus subject areas

Metals and Alloys

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title = "Stability of cuspidine (3CaO·2SiO2·CaF2) and phase relations in the CaO-SiO2-CaF2 system",

abstract = "Primary crystallization field of cuspidine (3CaO·2SiO2·CaF2) has been experimentally determined in the 2CaO·SiO2-SiO2-CaF2 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 SiF4 by reaction of CaF2 with moisture or SiO2 for quenching experiments. Combining the present study with the partial phase diagrams previously reported, the whole phase diagram of the CaO-SiO2-CaF2 system has been developed. Cuspidine equilibrates with (2CaO·SiO2)2CaF2, CaO·SiO2, 3CaO·2SiO2, 2CaO·SiO2 and CaF2 in solid state. Cuspidine coexists with liquid phases at temperatures between 1387 K and 1680 K.",

keywords = "CaSiOF, CaSiOF, CaO-SiO -CaF, Cuspidine, Mold powder, Phase diagram, Phase equilibria",

author = "Takashi Watanabe and Hiroyuki Fukuyama and Kazuhiro Nagata",

year = "2002",

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pages = "489--497",

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T1 - Stability of cuspidine (3CaO·2SiO2·CaF2) and phase relations in the CaO-SiO2-CaF2 system

AU - Watanabe, Takashi

AU - Fukuyama, Hiroyuki

AU - Nagata, Kazuhiro

PY - 2002

Y1 - 2002

N2 - Primary crystallization field of cuspidine (3CaO·2SiO2·CaF2) has been experimentally determined in the 2CaO·SiO2-SiO2-CaF2 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 SiF4 by reaction of CaF2 with moisture or SiO2 for quenching experiments. Combining the present study with the partial phase diagrams previously reported, the whole phase diagram of the CaO-SiO2-CaF2 system has been developed. Cuspidine equilibrates with (2CaO·SiO2)2CaF2, CaO·SiO2, 3CaO·2SiO2, 2CaO·SiO2 and CaF2 in solid state. Cuspidine coexists with liquid phases at temperatures between 1387 K and 1680 K.

AB - Primary crystallization field of cuspidine (3CaO·2SiO2·CaF2) has been experimentally determined in the 2CaO·SiO2-SiO2-CaF2 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 SiF4 by reaction of CaF2 with moisture or SiO2 for quenching experiments. Combining the present study with the partial phase diagrams previously reported, the whole phase diagram of the CaO-SiO2-CaF2 system has been developed. Cuspidine equilibrates with (2CaO·SiO2)2CaF2, CaO·SiO2, 3CaO·2SiO2, 2CaO·SiO2 and CaF2 in solid state. Cuspidine coexists with liquid phases at temperatures between 1387 K and 1680 K.

KW - CaSiOF

KW - CaO-SiO -CaF

KW - Cuspidine

KW - Mold powder

KW - Phase diagram

KW - Phase equilibria

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