"In-situ"Observation of Collision, Agglomeration and Cluster Formation of Alumina Inclusion Particles on Steel Melts
"In-situ"Observation of Collision, Agglomeration and Cluster Formation of Alumina Inclusion Particles on Steel Melts
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DOI：
10.2355/isijinternational.37.936
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发表时间：
1997-10
影响因子：
1.8
通讯作者：
H. Yin;H. Shibata;T. Emi;Mikio Suzuki
中科院分区：
文献类型：
--
作者：
H. Yin;H. Shibata;T. Emi;Mikio Suzuki
利用激光共聚焦扫描显微镜结合红外成像炉，首次在钢水表面“原位”观察到氧化铝与富铝固体包裹体颗粒之间的远距离强吸引，以及氧化铝团簇的碰撞、团聚和形成的详细顺序。该引力在10- 16n以上，对于大于3 μm的氧化铝颗粒可达10 μm以上，在促进颗粒间碰撞形成中间团聚体、中间团聚体之间碰撞形成松散氧化铝团簇、使松散氧化铝团簇致密成致密团簇等方面起着重要作用。研究了这种远距离强引力的来源是钢水表面氧化铝颗粒周围的毛细效应引起的。讨论了惰性气体-铝-钢液三相界面的界面现象。在工业实践中，利用注气/鼓泡炼钢时，细氧化铝夹杂物之间的毛细引力可以改善气泡/钢液界面的碰撞、团聚和团簇形成。
A long-range strong attraction between alumina and alumina-rich solid inclusion particles, and detailed sequence of the collision, agglomeration and formation of alumina clusters have been observed first time "in-situ" on molten steel surface by using a confocal scanning laser microscope combined with an infrared image furnace. This attraction force has been found to be over 10-16N, reach over 10 μm for alumina particles larger than 3 μm, and play an important role to promote collision between the particles to form intermediate aggregates, the same between the intermediate aggregates to form loose alumina clusters, and to densify the loose clusters into compact ones. The origin of this long-range strong attraction has been examined to be caused by capillary effect around alumina particles on molten steel surface. Interfacial phenomena at three-phase interface of inert gas-alumina-molten steel is also discussed. In industrial practice, the capillary attraction between the fine alumina inclusions can improve the collision, agglomeration and cluster formation at gas bubble/liquid steel interface when gas injection/bubbling is utilized for refining steels.