Scholarlink

<p>In this paper, the wetting behaviors of lanthanide rare-earth inclusions in Q355 molten steel at 1873&#xa0;K were investigated using the sessile drop method. It was deduced that the wetting angles of these inclusions increased in the order of La<sub>2</sub>S<sub>3</sub> (95.73°) &lt; La<sub>2</sub>O<sub>2</sub>S (121.58°) &lt; LaAlO<sub>3</sub> (129.41°) &lt; La<sub>2</sub>O<sub>3</sub> (138.08°), wherein higher angles represent a decreasing wettability with the molten steel. In addition, poorly wettable inclusions are easily detached from the molten steel and adsorbed onto the surface of the refractory material, subsequently forming nodules through deposition or interfacial reactions. Thermodynamic calculations and critical nucleation radius analysis indicate that LaAlO<sub>3</sub> possesses a greater thermal stability and a nucleation advantage. The modified Kralchevsky-Paunov model calculations indicated that the capillary force between the inclusions increased with decreasing particle distance and increasing particle size. During industrial production, the nodules observed at the submerged entry nozzle were predominantly comprised of LaAlO<sub>3</sub>, accompanied by La<sub>2</sub>O<sub>2</sub>S and La<sub>2</sub>O<sub>2</sub>, while La<sub>2</sub>S<sub>3</sub> was not detected. This study, therefore, provides a theoretical foundation for understanding the formation mechanisms of rare-earth inclusions and controlling clogging during continuous casting.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Wettability of LaAlO3, La2O3, La2S3 and La2O2S by Molten Steel at 1873 K

  • 期刊论文

  • 发表日期：

    2025年12月1日

查看全文
  • Dongjie Zhou,
  • Bo Zhao,
  • Wei Wu,
  • Feng Yang,
  • Xiaoping Chen

摘要

In this paper, the wetting behaviors of lanthanide rare-earth inclusions in Q355 molten steel at 1873 K were investigated using the sessile drop method. It was deduced that the wetting angles of these inclusions increased in the order of La2S3 (95.73°) < La2O2S (121.58°) < LaAlO3 (129.41°) < La2O3 (138.08°), wherein higher angles represent a decreasing wettability with the molten steel. In addition, poorly wettable inclusions are easily detached from the molten steel and adsorbed onto the surface of the refractory material, subsequently forming nodules through deposition or interfacial reactions. Thermodynamic calculations and critical nucleation radius analysis indicate that LaAlO3 possesses a greater thermal stability and a nucleation advantage. The modified Kralchevsky-Paunov model calculations indicated that the capillary force between the inclusions increased with decreasing particle distance and increasing particle size. During industrial production, the nodules observed at the submerged entry nozzle were predominantly comprised of LaAlO3, accompanied by La2O2S and La2O2, while La2S3 was not detected. This study, therefore, provides a theoretical foundation for understanding the formation mechanisms of rare-earth inclusions and controlling clogging during continuous casting.