Abstract: To investigate the corrosion resistance of SiC refractory materials in the sodium smelting process of vanadium titanium magnetite, the wettability and interface behavior between vanadium titanium magnetite sodium smelting slag and SiC refractory substrate were studied in this research. In the process of the research, the sodium smelting slag of vanadium titanium magnetite and SiC refractory substrate were used as the experimental materials, a high-temperature wetting experimental device was used to investigate the influence of Na2O content changes on the wetting and interfacial behavior between the slag and the SiC refractory by the sessile drop method. The results indicated that as the Na2O content in the slag increased, the melting point of the slag significantly decreased, improving the wetting and spreading on the SiC substrate. At the same time and temperature, the contact angle between the molten slag and the SiC refractory substrate decreased with the increase of Na2O content. The interfacial energy between the refractory substrates was also reduced, leading to a tight bond between the slag and the SiC refractory substrate and easier wetting between the two phases. The formation of numerous sodium-containing low-melting compounds in the slag reduced its viscosity and enhanced its fluidity, thereby intensifying the diffusion of molecules or ions within the slag, which accelerated the oxidation of the SiC refractory material. As the Na2O content increased from 20.00wt% to 40.00wt%, the interaction between the slag and the substrate transitioned from a separated to an adhesive state, eventually forming a uniform reaction layer. The SiC refractory material exhibited good corrosion resistance to slag with 20.00wt% Na2O content, but this resistance gradually decreased as the Na2O content increased. These research results may provide some theoretical basis for the study of slag resistance in refractory materials during the sodium smelting process of vanadium titanium magnetite.

Key words: vanadium titanium magnetite smelting slag, wettability, contract angle, interfacial behavior, SiC

摘要： 为了研究SiC耐火材料在钒钛磁铁矿钠化冶炼工艺中的耐腐蚀性能，本工作对钒钛磁铁矿钠化冶炼渣与SiC耐火材料基板间的润湿及界面行为进行了研究。研究过程采用高温润湿实验装置，以钒钛磁铁矿钠化冶炼渣及SiC耐火材料为实验原料，采用静滴法考察了Na2O含量的变化对熔渣与耐火材料之间润湿及界面行为的影响。结果表明，随着熔渣中Na2O含量的增加，熔渣的熔点明显降低，在SiC基板上润湿铺展效果变好。同一时间及温度下，熔渣与SiC耐火材料基板间的接触角随着Na2O含量的增加而减小，熔渣与SiC耐火材料基板之间的界面能也随之降低，使熔渣与SiC耐火材料基板粘接紧密，两相之间更容易润湿；熔渣中生成的大量含钠低熔点化合物降低了熔渣的黏度，提高了其流动性，渣中分子或离子的传质扩散增强，从而加速了SiC耐火材料的氧化。Na2O含量从20.00wt%增加至40.00wt%，熔渣与基板间从分离状态过度到粘连状态，最终出现均匀的反应层。SiC耐火材料对20.00wt% Na2O含量的熔渣具有较好的抗侵蚀效果，随着Na2O含量增加，抗侵蚀性能逐渐下降。研究结果为钒钛磁铁矿钠化冶炼过程中耐火材料的抗渣研究提供了一定的依据。

关键词: 钒钛磁铁矿冶炼渣, 润湿性, 接触角, 界面行为, SiC