Viscosity and structure of CaO-BaO-SiO_(2)-Al_(2)O_(3)-based mold slags for continuous casting of high titanium steel with different Tio2 absorption  

作　　者：Ya-tao Cui Xue-you Wang Xu-bin Zhang Qiang-qiang Wang Sheng-ping He 

机构地区：[1]College of Materials Science and Engineering,Chongqing University,Chongqing 400044,China

出　　处：《Journal of Iron and Steel Research International》2024年第8期1936-1946,共11页钢铁研究学报（英文版）

基　　金：The authors are grateful for support from the National Natural Science Foundation China(Grant Nos.52274317,52074054,and 52004045);the Fundamental Research Funds for the Central Universities(Grant No.2023CDJXY-020);College of Materials Science and Engineering at Chongqing University,China;the Henan Tongyu Metallurgy Materials Group Co.Ltd.,Xixia,China.

摘　　要：The effect of TiO_(2) absorption into two different CaO-BaO-SiO_(2)-Al_(2)O_(3)-based mold slags from the steel plant on the viscosity,melting performance and microstructure of slags was investigated through the measurement of the viscosity-temperature relationship,melting temperature and Raman spectroscopy.The parameter of the number of non-bridging oxygen per tetrahedrally-coordinated atom(NBO/T)was also calculated to explain the microstructure variation of molten slags with different TiO_(2) absorption.The variation of the actual slag consumption and the depth of the liquid slag in mold was explained through the comparison of the viscosity and the melting temperature of two different slags.The viscosity of mold slags(basicity=0.6)decreased from 1.1 to 0.68 Pa s with the increase in the Ti0_(2) absorption from 0 to 10%,while that of slags(basicity=0.7)decreased from 0.76 to 0.56 Pa s with the Ti0_(2) absorption from 0 to 6%.The activation energy of both two groups of slags had the tendency to decrease with the increasing TiO_(2) absorption.The network structure of both two groups of slags measured by the Raman spectra showed that the fraction of complex structure units(Q^(1),Q^(2),Q^(3) and A1-O-Al)decreased and simple structure units(Al-O-and Q^(0))increased with the increase in TiO_(2) absorption.NBO/T also increased with the increase in the TiO2 absorption,indicating that the absorption of TiO_(2) into slags resulted in the destruction of silicate/aluminate structure.Hence,the absorption of TiO_(2) into the current CaO-BaO-SiO_(2)-Al_(2)O_(3) mold slags decreased the degree of polymerization of these slags and then led to the decrease of viscosity.

关 键 词：Mold slag VISCOSITY Melting temperature Slag consumption Liquid slag depth STRUCTURE 

分 类 号：TF777[冶金工程—钢铁冶金]