CaO-Al2O3-based mold fluxes, which are under development for the continuous casting of high-Al steel, contain fluxing compounds, such as Na2O and B2O3. The reaction between [Al] and the fluxing agents in mold fluxes leads to an increase in Al2O3 and a decrease in B2O3 and Na2O concentrations, changing the properties of mold fluxes. The effect of the Al2O3/(B2O3 + Na2O) ratio on the melting properties, viscosity, heat transfer, and structure of the CaO-Al2O3-based mold fluxes is presented in this work. The increase of the Al2O3/(B2O3 + Na2O) ratio in the fluxes raised the melting temperature and high-temperature viscosity of mold fluxes but decreased the heat transfer rate across the flux disks. It also enhanced the degree of polymerization by promoting the formation of 3-D aluminate structure, which accounted for the change of the viscous behavior.

中文翻译：

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Al2O3/(B2O3 + Na2O) 比对 CaO-Al2O3 基助熔剂的影响：熔化性能、粘度、传热和结构

基于 CaO-Al2O3 的保护渣正在开发中，用于高铝钢的连铸，其中含有助熔剂化合物，如 Na2O 和 B2O3。[Al] 与保护渣中助熔剂之间的反应导致 Al2O3 增加，B2O3 和 Na2O 浓度降低，从而改变了保护渣的性质。本文介绍了 Al2O3/(B2O3 + Na2O) 比率对 CaO-Al2O3 基保护渣的熔化性能、粘度、传热和结构的影响。助熔剂中Al2O3/(B2O3+Na2O)比值的增加提高了结晶器助熔剂的熔化温度和高温粘度，但降低了助熔剂盘的传热率。它还通过促进 3-D 铝酸盐结构的形成来提高聚合度，这解释了粘性行为的变化。