Effect of B2O3 on Viscosity and Viscoelasticity of Lime Silica Based Mold Flux
Shear thinning behavior of molten mold flux had been identified by the author in the previous research.This particular property might be beneficial for the actual continuous casting due to the fact that actual operation needs high viscosity at mold top surface where shear rate is approximately between 10 and 40/sec for alleviating slag entrainments whereas the viscosity should be low at mold wall where shear rate is roughly between 100 and 1000/sec for maximizing lubrication capability.For this reason,the present study tries to find the solution to maximize shear thinning behavior by changing structure of mold flux with additive B2O3 contents.The first step of present study is to identify the structure changes of silicate based mold flux according to increasing borate contents by Raman spectroscopy with which the degree of polymerization and amounts of specific units could be estimated.The second step is to conduct the viscosity measurement according to the shear rate changes by rotational type viscometer.The degree of shear thinning has been well quantified by Oswald-De Waele power law model.In doing so,the present study successfully achieve the stronger shear thinning behavior and discover the rationale behind this.
shear thinning raman spectroscopy mold flux and borosilicate glass
Seung-Ho SHIN Jung-Wook CHO Seon-hyo KIM
Department of Materials Science and Engineering,Pohang University of Science and Technology,Pohang 7 Graduate Institute of Ferrous Technology,Pohang University of Science and Technology,Pohang 790-784,
国际会议
the 6th International Congress on the Science and Technology of Steelmaking,ICS2015(第六届国际炼钢科技大会)
北京
英文
580-583
2015-05-12（万方平台首次上网日期，不代表论文的发表时间）