摘要
采用热丝法对不同TiO_(2)含量的CaO-Al_(2)O_(3)-TiO_(2)基保护渣进行接触角试验,计算出保护渣表面张力和钢渣界面张力,分析TiO_(2)含量对保护渣接触角、表面张力、界面张力的影响规律。结合拉曼光谱,分析TiO_(2)在微观结构上对钢渣界面张力的影响机理。研究结果表明,1 723 K温度下,保护渣中TiO_(2)质量分数为4%~12%时,接触角为15.3°~38.5°,保护渣表面张力为523~541 mN/m;在保护渣TiO_(2)质量分数为4%~10%和10%~12%时,钢渣界面张力变化量分别为4 mN/m和82 mN/m。TiO_(2)质量分数为4%~10%时,界面张力基本保持不变,钢渣间界面反应变弱,钢渣易分离,更符合高钛钢连铸生产的需求。随着TiO_(2)含量的增加,离子半径增加,阴阳离子间距增大,熔体内主要阴离子为TiO_(4)^(4-)单体和Ti_(2)O_(4)^(6-)链单元,复合阴离子被排挤到熔体表面,阴阳离子间结合力降低,进一步导致表面张力降低。
The contact angle experiments of CaO-Al_(2)O_(3)-TiO_(2)-based mold flux with different TiO_(2) contents were carried out by hot wire method,the surface tension of mold flux and interfacial tension of steel and slag were calculated,and the influence of TiO_(2) content on the contact angle,surface tension and interfacial tension was analyzed.Combined with Raman spectroscopy,the influence mechanism of TiO_(2) on the interfacial tension of steel and slag in the microstructure was analyzed.The research results show that at 1 723 K,when the TiO_(2) mass fraction in mold flux is 4%-12%,contact angle is 15.3°-38.5° and surface tension of mold flux is 523-541 mN/m.When the TiO_(2) mass fraction in mold flux is 4%-10% and 10%-12%,the interfacial tension changes of steel and slag are 4 mN/m and 82 mN/m,respectively.When TiO_(2) mass fraction is 4%-10%,the interfacial tension remains basically unchanged,the interface reaction between steel and slag becomes weaker,and the steel and slag is easy to separate,which is more in line with the needs of continuous casting production of high-titanium steel.With the increase of TiO_(2) content,the ionic radius increases,and the distance between anions and cations increases.The main anions in melt are TiO_(4)^(4-) monomer and Ti_(2)O_(4)^(6-) chain units.The composite anions are extruded to the surface of melt,and the binding force between anions and cations decreases,further resulting in a decrease in surface tension.
作者
王杏娟
王宇
朱立光
邸天成
朴占龙
WANG Xing-juan;WANG Yu;ZHU Li-guang;DI Tian-cheng;PIAO Zhan-long(College of Metallurgy and Energy,North China University of Science and Technology,Tangshan 063210,Hebei,China;Hebei High Quality Steel Continuous Casting Technology Innovation Center,Tangshan 063000,Hebei,China;School of Materials Science and Engineering,Hebei University of Science and Technology,Shijiazhuang 050000,Hebei,China)
出处
《中国冶金》
CAS
北大核心
2022年第8期56-61,97,共7页
China Metallurgy
基金
国家自然科学基金资助项目(51974133)
河北省自然科学基金资助项目(E2019209543)。
关键词
高钛钢
保护渣
接触角
表面张力
热丝法
拉曼光谱
high titanium steel
mold flux
contact angle
surface tension
hot wire method
Raman spectroscopy
