BaO和MgO含量对CaO–Al<sub>2</sub>O<sub>3</sub>系保护渣与钢基底之间润湿行为的影响

周乐君; 罗豪; 王万林; 吴厚发; 高尔卓; 周游; 黄道远

doi:10.1007/s12613-021-2300-8

Volume 29 Issue 6

Jun. 2022

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文章导航 > 矿物冶金与材料学报（英文） > 2022 > 29(6): 1179-1185

Lejun Zhou, Hao Luo, Wanlin Wang, Houfa Wu, Erzhuo Gao, You Zhou, and Daoyuan Huang, Wetting behavior of CaO–Al₂O₃-based mold flux with various BaO and MgO contents on the steel substrate, Int. J. Miner. Metall. Mater., 29(2022), No. 6, pp. 1179-1185. https://doi.org/10.1007/s12613-021-2300-8

Cite this article as:

Lejun Zhou, Hao Luo, Wanlin Wang, Houfa Wu, Erzhuo Gao, You Zhou, and Daoyuan Huang, Wetting behavior of CaO–Al2O3-based mold flux with various BaO and MgO contents on the steel substrate, Int. J. Miner. Metall. Mater., 29(2022), No. 6, pp. 1179-1185. https://doi.org/10.1007/s12613-021-2300-8

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研究论文

BaO和MgO含量对CaO–Al₂O₃系保护渣与钢基底之间润湿行为的影响

1)
中南大学冶金与环境学院，长沙410083，中国
2)
国家清洁冶金国际联合研究中心，长沙410083，中国

通讯作者:
王万林 E-mail: wanlin.wang@gmail.com

中文摘要

结晶器内的界面现象对连铸过程的顺行和铸件的质量有很大的影响，虽然钢–渣之间的界面特性已经被许多研究者研究过，但是这些研究大多是已钢或铁为研究对象。传统的CaO–SiO₂系保护渣在参与高铝钢连铸时会与钢中的Al发生化学反应，导致保护渣的成分和性能发生变化，从而影响连铸顺行。因此，性能稳定的非反应型CaO–Al₂O₃系保护渣，成为高铝钢连铸过程的一种潜在功能材料。本文采用卧滴法，研究了BaO和MgO含量对非反应型CaO–Al₂O₃系保护渣润湿行为的影响，测量了渣-钢之间的接触角，并计算了界面张力。此外，还利用XPS测定了钢-渣界面处的氧种类，以证明保护渣成分和界面之间的内在联系。研究结果表明：BaO和MgO对保护渣的润湿行为有着不同的影响，具体而言，当BaO含量从3wt%增加到7wt%时，渣与IF钢的接触角从62.4°增加到74.5°，界面张力也从1630.3 mN/m增加到1740.8 mN/m。 XPS的结果表明，随着BaO的加入，钢–渣界面处的熔体结构发生聚合，O−(非桥氧)和O²⁻（游离氧）的比例降低，而O0(桥氧)的比例增加，这说明BaO的加入会降低熔剂对IF钢的润湿性。而当MgO含量从3wt%增加到7wt%时，渣与IF钢基体的接触角从62.4°减少到51.3°，界面张力也从1630.3 mN/m降低到1539.7 mN/m。加入MgO时，钢–渣界面处的熔体结构发生解聚，由于部分O0分解为O⁻和O²⁻，导致O0的比例减少，这说明MgO提高了IF钢的润湿性，使熔剂更容易在IF钢表面浸润。引起这一结果的主要原因是，Mg²⁺离子半径小于Ba²⁺离子，Mg²+的静电势也高于Ba²⁺，较高的静电势导致O²⁻和Mg²⁺之间产生较强的极化效应，导致熔体中Mg–O键由离子键向共价键转变，从而使得Mg²⁺的电荷补偿效应远远小于Ba²⁺。

关键词:

Research Article

Wetting behavior of CaO–Al₂O₃-based mold flux with various BaO and MgO contents on the steel substrate

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Abstract

Abstract

The interfacial phenomena in mold have a great impact on the smooth operation of continuous casting process and the quality of the casting product. In this paper, the wetting behavior of CaO–Al₂O₃-based mold flux with different BaO and MgO contents was studied. The results showed that the contact angle between molten flux and interstitial free (IF) steel substrate increased from 62.4° to 74.5° with the increase of BaO content from 3wt% to 7wt%, while it decreased from 62.4° to 51.3° with the increase of MgO content from 3wt% to 7wt%. The interfacial tension also increased from 1630.3 to 1740.8 mN/m when the BaO content increased, but it reduced from 1630.3 to 1539.7 mN/m with the addition of MgO. The changes of contact angle and interfacial tension were mainly due to the fact that the bridging oxygen (O⁰) at the interface was broken into non-bridging oxygen (O⁻) and free oxygen (O²⁻) by MgO. However, more O⁻ and O²⁻ connected into O⁰ when BaO was added, since the charge compensation effect of BaO was so stronger that it offset the effect of providing O²⁻.
- mold flux;
- wetting;
- contact angle;
- interfacial tension;
- melt structure;
- continuous casting

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BaO和MgO含量对CaO–Al₂O₃系保护渣与钢基底之间润湿行为的影响

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Wetting behavior of CaO–Al₂O₃-based mold flux with various BaO and MgO contents on the steel substrate

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BaO和MgO含量对CaO–Al2O3系保护渣与钢基底之间润湿行为的影响

中文摘要

Wetting behavior of CaO–Al2O3-based mold flux with various BaO and MgO contents on the steel substrate

Abstract

References

数据统计

Catalog

BaO和MgO含量对CaO–Al₂O₃系保护渣与钢基底之间润湿行为的影响

Wetting behavior of CaO–Al₂O₃-based mold flux with various BaO and MgO contents on the steel substrate