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首页> 外文期刊>Journal of Non-Crystalline Solids: A Journal Devoted to Oxide, Halide, Chalcogenide and Metallic Glasses, Amorphous Semiconductors, Non-Crystalline Films, Glass-Ceramics and Glassy Composites >Effect of slag-steel reaction on the structure and viscosity of CaO-SiO2-based mold flux during high-Al steel casting
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Effect of slag-steel reaction on the structure and viscosity of CaO-SiO2-based mold flux during high-Al steel casting

机译：渣-钢反应对高铝铸钢中CaO-SiO2基保护渣结构和粘度的影响

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摘要

In this study, to establish the structure-viscosity relationship of mold.flux before and after the slag-steel reaction, the structure of CaO-SiO2-based and CaO-SiO2-Al2O3-based mold fluxes was investigated by Raman spectroscopy and magic angle spinning nuclear magnetic resonance. The results show that Si atoms are replaced by Al atoms and act as the network formers for the slag-steel reaction. Al has three types of coordination number (Al-IV, Al-V, and Al-VI species) in the mold flux, but only the Al-VI species mainly forming AlO4 and AlO3F can take part in the formation of the three-dimensional (3D) network. During the slag-steel reaction process, the degree of polymerization decreases first and then increases. The 3D-network of the original CaO-SiO2-based slag is connected by the Si-O-Si linkages; however, it is converted to the CaO-SiO2-Al2O3-based slag mainly connected by Si-O-Si, Al-O-Al, and Al-O-Si linkages during this conversion. The change in the degree of polymerization and chemical bond properties will affect the structural stability and deteriorate rheological characteristic during this conversion. Hence, the effects of slag-steel reaction on the structural stability and rheological characteristic must be controlled in the design process of CaO-SiO2-based mold flux for high-Al steel casting. (C) 2016 Elsevier B.V. All rights reserved.
机译：为了建立渣-钢反应前后的结晶器-熔剂的结构-粘度关系，通过拉曼光谱和魔角研究了CaO-SiO2基和CaO-SiO2-Al2O3基熔剂的结构。旋转核磁共振。结果表明，Si原子被Al原子取代，并作为渣钢反应的网络形成剂。 Al在保护渣中具有三种类型的配位数（Al-IV，Al-V和Al-VI物质），但是只有主要形成AlO4和AlO3F的Al-VI物质才能参与三维熔体的形成。 （3D）网络。在炉渣-钢反应过程中，聚合度先降低然后升高。原始的CaO-SiO2基炉渣的3D网络通过Si-O-Si键连接。但是，在这种转化过程中，它被转化为主要通过Si-O-Si，Al-O-Al和Al-O-Si键连接的CaO-SiO2-Al2O3基渣。聚合度和化学键性质的变化将影响该转化过程中的结构稳定性并降低流变特性。因此，在高铝铸钢用CaO-SiO2基保护渣的设计过程中，必须控制渣钢反应对组织稳定性和流变性的影响。 （C）2016 Elsevier B.V.保留所有权利。

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