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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

  • 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+。
    • Research Article

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

    + Author Affiliations
      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−.
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