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Effective Mechanism of B2O3 on the Structure and Viscosity of CaO–SiO2–B2O3‐based Melts
Steel Research International ( IF 2.2 ) Pub Date : 2020-10-29 , DOI: 10.1002/srin.202000531
Shama Sadaf 1 , Ting Wu 1, 2 , Lei Zhong 1 , Zhi-you Liao 1, 2 , Hai-chuan Wang 1, 2 , Wan-lin Wang 3
Affiliation  

To have a further study for fluorine‐free mold fluxes, the structure, viscosity characteristics, and crystallization behavior of CaO–SiO2–B2O3‐based melts are studied combing molecular dynamics (MD) simulation and various experiments. The results show that, in the ternary CaO–SiO2–B2O3 glass system, stable structural units of [SiO4]4− tetrahedral, [BO3]3− trihedral, and [BO4]5− tetrahedral formed and the B2O3 addition polymerizes the Si–O network structure to some extent, whereas the influence on B–O network structure various with its content. In fluorine‐free mold fluxes, the viscosity at 1300 °C and melting temperature decrease with B2O3 addition, whereas the polymerization degree of slag network structure changes little, indicating that the melting property change plays a predominant role in decreasing the viscosity at 1300 °C. Moreover, due to the solid precipitation, the viscosity‐temperature curve of fluorine‐free slag in the range w(B2O3) = 4–6 wt% shows the characteristics of alkaline slag, whereas it shows the characteristics of acidic slag in the range w(B2O3) = 8–12 wt%. The MD simulation and experiment results are verified and complemented each other.

中文翻译:

B2O3对CaO–SiO2–B2O3基熔体的结构和粘度的有效机理

为了进一步研究无氟模具熔剂,结合分子动力学(MD)模拟和各种实验,研究了基于CaO–SiO 2 –B 2 O 3的熔体的结构,粘度特性和结晶行为。结果表明,在三元CaO–SiO 2 –B 2 O 3玻璃体系中,形成了[SiO 4 ] 4−四面体,[BO 3 ] 3−三面体和[BO 4 ] 5−四面体的稳定结构单元。B 2 O 3加成使Si-O网络结构在某种程度上聚合,而对B-O网络结构的影响随其含量而变化。在无氟保护渣中,随着B 2 O 3的加入,1300°C的粘度和熔融温度降低,而渣网络结构的聚合度变化不大,表明熔融性能的变化在降低熔融温度方面起着主要作用。 1300°C。此外,由于固体沉淀,在w(B 2 O 3)= 4–6 wt%范围内的无氟炉渣的粘度-温度曲线显示出碱性炉渣的特性,而显示出了酸性炉渣的特性。范围w(B 2O 3)= 8–12 wt%。MD仿真和实验结果得到了验证和补充。
更新日期:2020-10-29
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