摘要
传统保护渣大多属于牛顿流体,其黏度往往是一个恒定的值,在连铸生产中具有一定的局限性。为了满足高拉速连铸生产对保护渣性能的要求,急需研制一种具有剪切变稀性质的非牛顿流体保护渣。通过向CaO-SiO_2-CaF_2系传统保护渣中加入不同含量的B_2O_3,使其具有非牛顿流体特性,并分别从热力学和动力学角度对保护渣的剪切变稀性质进行了分析研究,结果发现产生这种剪切变稀性质的原因属于一种由于施加单向剪切应力造成的临时黏度损失,而且其强弱与分子聚合度的大小密切相关。
The traditional mold flux has the characteristics of Newton fluid whose viscosity tends to be a constant value, leading to have some limitations in continuous casting production. In order to meet the demand on the characteristics of mold flux for high speed casting production,it is necessary to develop a new kind of non-Newtonian fluid mold flux with shear thinning property. After adding different content of Bz03 to the CaO-SiOz-CaFz system mold flux, the mold flux had the characteristics of non-Newtonian fluid. The shear thinning property of mold flux was analyzed from the point of view of thermodynamics and kinetics. The results demonstrated that the cause of shear thinning could be attributed to the temporary viscosity loss caused by the one-way shear stress, whereas the corresponding intensity was closely related to the molecular polymerization degree.
出处
《炼钢》
CAS
北大核心
2017年第3期25-30,共6页
Steelmaking
基金
国家自然科学青年基金(51404088)
河北省自然科学基金(E2015209217)
关键词
保护渣
非牛顿流体
黏度
剪切变稀
分子聚合度
mold flux
non-Newtonian fluid
viscosity
shear thinning
molecular polymerization degree
