摘要
为兼顾钙铝基连铸保护渣在结晶器弯月面上下方不同剪切速率区域的冶金功能,从非牛顿流体特性角度出发,研究了CaO-Al_(2)O_(3)-Li_(2)O-B_(2)O_(3)保护渣的剪切变稀特性。结果表明,在剪切稀化温度区间内,随着温度的降低,保护渣剪切变稀特性逐渐增强。在钙铝基保护渣中,B_(2)O_(3)对剪切变稀特性具有明显的抑制作用,该作用与其在硅酸系保护渣中的作用明显相反。在1300℃下,B_(2)O_(3)质量分数由4%提高至6%时,保护渣剪切变稀特性逐渐减弱。当B_(2)O_(3)质量分数提高至8%时,保护渣转变为牛顿流体,剪切变稀特性消失。
To take into account the performance of the calcium-aluminum-based mold flux in regions of the mold with different shear rates,the shear-thinning properties of the CaO-Al_(2)O_(3)-Li_(2)O-B_(2)O_(3) mold flux were studied from the perspective of non-Newtonian fluid characteristics.The results show that in the shear-thinning temperature range,as the temperature decreased,the shear-thinning properties of the mold flux become stronger.In the calcium-aluminum-based mold flux,B_(2)O_(3) had a significant inhibitory effect on the shear-thinning properties,which was opposite to its role in the silica-based mold flux.At 1 300℃,when the mass fraction of B_(2)O_(3) increased from 4%to 6%,the shear-thinning properties gradually become weaker.When the mass fraction of B_(2)O_(3) increased to 8%,the molten slag was transformed into a Newtonian fluid,showing no shear thinning properties.
作者
刘昊
亓捷
刘承军
姜茂发
LIU Hao;QI Jie;LIU Cheng-jun;JIANG Mao-fa(Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry Education),Northeastern University,Shenyang110819,Liaoning,China;School of Metallurgy,Northeastern University,Shenyang 110819,Liaoning,China)
出处
《连铸》
2021年第2期19-24,共6页
Continuous Casting
基金
国家自然科学基金资助项目(51904064,U1908224,51874082,51974075)
中国博士后科学基金资助项目(2020T130084,2019M661114)。
关键词
钙铝基保护渣
剪切变稀
非牛顿流体
黏度
高铝钢
calcium-aluminum-based mold flux
shear-thinning
non-Newtonian fluid
viscosity
high aluminum steel
