Effect of alkali oxides on crystallization in CaO-SiO2-CaF2 glasses

被引：54

作者：

Watanabe, Takashi ^{[1
]}

Hashimoto, Hidetaka ^{[1
]}

Hayashi, Miyuki ^{[1
]}

Nagata, Kazuhiro ^{[1
]}

机构：

[1] Tokyo Inst Technol, Grad Sch Sci & Engn, Meguro Ku, Tokyo 1528552, Japan

来源：

ISIJ INTERNATIONAL | 2008年 / 48卷 / 07期

关键词：

mold flux; crystallization; 3CaO center dot 2SiO(2)center dot CaF2; alkali oxide; Kissinger's plot;

D O I：

10.2355/isijinternational.48.925

中图分类号：

TF [冶金工业];

学科分类号：

0806 [冶金工程];

摘要：

In the initial solidification stage in continuous steel casting, controlled crystallinity of the slag film is essential for regulating the horizontal heat flux from the strand to the mold. The effects of alkali oxides on the formation of cuspidine (3CaO center dot 2SiO(2)center dot CaF2), which is the primary crystalline phase in the flux film in CaO-SiO2-CaF2-M2O glasses (M=Li, Na, K), were investigated in both isothermal and heating conditions. Addition of alkali oxides enhances crystallization of cuspidine by lowering the glass transition temperature and lowering the apparent activation energy of crystal growth. However, single excess addition of alkaline oxide (M2O) hinders the formation of cuspidine as CaF2 is substituted by M2O.

引用

页码：925 / 933

页数：9

共 24 条

[1]

BARIN I, 1995, THERMOCHEMICAL DAT 1

[2]

Radiative heat transfer through mold flux film during initial solidification in continuous casting of steel [J].