Pulsed electric current is used to control the interface structure between Al-C nozzle material and the molten steel containing rare earth in this work. In the absence of a pulsed electric current, the interface shows a loose, rough structure with nodules, and interconnected holes are observed in the interface layer. Furthermore, inclusions CeAlO₃/LaAlO₃ adhere to the surface of the nozzle. However, pulsed electric current causes the interface to form amorphously, which results in a smooth and dense interface structure. As a result, the thickness of the interface layer without a pulsed electric current exceeds 1000 μm. However, by applying a pulsed electric current, the average thickness of the interface layer is only about 280 μm. That is, the thickness of the interface layer is reduced by about 70 pct. Besides, by investigating the corrosion of molten steel on Al-C nozzle material and adhesion of inclusions on the surface, the formation mechanism of the interface structure with and without pulsed electric current is discussed. Manuscript submitted August 30, 2020; accepted February 15, 2021.

在这项工作中，使用脉冲电流来控制Al-C喷嘴材料与含稀土的钢水之间的界面结构。在没有脉冲电流的情况下，界面显示出带有结节的松散，粗糙的结构，并且在界面层中观察到了相互连接的孔。此外，夹杂物CeAlO ₃ / LaAlO ₃附着在喷嘴的表面上。但是，脉冲电流会导致界面无定形地形成，从而导致光滑而致密的界面结构。其结果是，界面层的没有脉冲电流的厚度超过1000 μ米。然而，通过施加脉冲电流，界面层的平均厚度仅为约280 μ米 即，界面层的厚度减小了约70％。此外，通过研究钢水对铝碳喷嘴材料的腐蚀和夹杂物在表面的附着力，探讨了有无脉冲电流时界面结构的形成机理。2020年8月30日提交手稿；2021年2月15日接受