Al<sub>2</sub>O<sub>3</sub>夹杂物在浸入式水口内衬材料上的成核与反应性研究

doi:10.11896/cldb.23080196

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Abstract To composite silicon-free and carbon-free liner in submerged entry nozzle is an important measure to slow down the clogging. In order to further study the clogging of Al₂O₃ inclusions on the liner surface, the nucleation trend and reactivity of Al₂O₃ inclusions on zirconia liner, MgO-Al₂O₃ spinel liner, corundum liner and mullite liner was studied by lattice mismatch calculation and high temperature simulation test, respectively. The heterogeneous nucleation mechanism and deposition process were also analyzed based on microstructure observation. The results showed that the two-dimensional mismatch between Al₂O₃ inclusions and corundum liner, zirconia liner, spinel liner and mullite liner is 0%, 30.97%, 8.43% and 11.14%, respectively, it indicated that Al₂O₃ inclusion was easy to nucleate on corundum liner and difficult to nucleate on zirconia liner. Zirconia-based material was suitable as anti-clogging materials for submerged entry nozzle. The results of high temperature simulation test were consistent with those of two-dimensional mismatch calculation. Zirconia liner was not easy to react with molten steel and the degree of Al₂O₃ clogging on its surface was the lightest in these four liners. The thickness of Al₂O₃ clogging on zirconia liner was only 0.20 mm, which is only half of that on corundum liner, spinel liner or mullite liner. Based on the lattice mismatch theory, this work proposed an optimization strategy for Al₂O₃ anti-clogging materials, which should provide a scientific guidance for the development of high-performance functional refractories.

Key words： submerged entry nozzle Al₂O₃ clogging deposition lattice mismatch heterogeneous nucleation

Published: 25 December 2024 Online: 2024-12-20

CLC number:

TQ175

Fund:National Natural Science Foundation of China (51932008,52302031),Leading Talents in Science and Technology Innovation in Central Plains (204200510011),National Key Research and Development Program (2021YFB3701404).

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	YIN Yanfei
	GU Qiang
	LI Hongxia
	LIU Guoqi
	LI Xinzhe

Cite this article:

YIN Yanfei,GU Qiang,LI Hongxia, et al. Study on the Nucleation and Reactivity of Al₂O₃ Inclusions on the Liner of Submerged Entry Nozzle[J]. Materials Reports, 2024, 38(24): 23080196-8.

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http://www.mater-rep.com/EN/10.11896/cldb.23080196 OR http://www.mater-rep.com/EN/Y2024/V38/I24/23080196

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