Effect of TiO<sub>2</sub> on the viscosity and structure of low-fluoride slag used for electroslag remelting of Ti-containing steels

Cheng-bin Shi; Ding-li Zheng; Seung-ho Shin; Jing Li; Jung-wook Cho

doi:10.1007/s12613-017-1374-9

Volume 24 Issue 1

Jan. 2017

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文章导航 > 矿物冶金与材料学报（英文） > 2017 > 24(1): 18-24

Cheng-bin Shi, Ding-li Zheng, Seung-ho Shin, Jing Li, and Jung-wook Cho, Effect of TiO₂ on the viscosity and structure of low-fluoride slag used for electroslag remelting of Ti-containing steels, Int. J. Miner. Metall. Mater., 24(2017), No. 1, pp. 18-24. https://doi.org/10.1007/s12613-017-1374-9

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Cheng-bin Shi, Ding-li Zheng, Seung-ho Shin, Jing Li, and Jung-wook Cho, Effect of TiO2 on the viscosity and structure of low-fluoride slag used for electroslag remelting of Ti-containing steels, Int. J. Miner. Metall. Mater., 24(2017), No. 1, pp. 18-24. https://doi.org/10.1007/s12613-017-1374-9

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研究论文

Effect of TiO₂ on the viscosity and structure of low-fluoride slag used for electroslag remelting of Ti-containing steels

State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing 100083, China
Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang 790-784, Republic of Korea

通讯作者:
Cheng-bin Shi E-mail: chengbin.shi@ustb.edu.cn

中文摘要

The viscosity of CaF₂-CaO-Al₂O₃-MgO-(TiO₂) slag was measured using a rotating crucible viscometer. Raman spectroscopy analysis was performed to correlate the viscosity to slag structure. The viscosity of the slag was found to decrease with increasing TiO₂ content in the slag from 0 to 9.73wt%. The activation energy decreased from 95.16 kJ/mol to 79.40 kJ/mol with increasing TiO₂ content in the slag. The introduction of TiO₂ into the slag played a destructive role in Al-O-Al structural units and Q⁴ units by forming simpler structural units of Q² and Ti₂O₆^4- chain. The amount of Al-O-Al significantly decreased with increasing TiO₂ content. The relative fraction of Q⁴ units in the[AlO₄]^5--tetrahedral units shows a decreasing trend, whereas the relative fraction of Q² units and Ti₂O₆^4- chain increases with increasing TiO₂ content accordingly. Consequently, the polymerization degree of the slag decreases with increasing TiO₂ content. The variation in slag structure is consistent with the change in measured viscosity.

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Research Article

Effect of TiO₂ on the viscosity and structure of low-fluoride slag used for electroslag remelting of Ti-containing steels

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Abstract

Abstract

The viscosity of CaF₂-CaO-Al₂O₃-MgO-(TiO₂) slag was measured using a rotating crucible viscometer. Raman spectroscopy analysis was performed to correlate the viscosity to slag structure. The viscosity of the slag was found to decrease with increasing TiO₂ content in the slag from 0 to 9.73wt%. The activation energy decreased from 95.16 kJ/mol to 79.40 kJ/mol with increasing TiO₂ content in the slag. The introduction of TiO₂ into the slag played a destructive role in Al-O-Al structural units and Q⁴ units by forming simpler structural units of Q² and Ti₂O₆^4- chain. The amount of Al-O-Al significantly decreased with increasing TiO₂ content. The relative fraction of Q⁴ units in the[AlO₄]^5--tetrahedral units shows a decreasing trend, whereas the relative fraction of Q² units and Ti₂O₆^4- chain increases with increasing TiO₂ content accordingly. Consequently, the polymerization degree of the slag decreases with increasing TiO₂ content. The variation in slag structure is consistent with the change in measured viscosity.
- electroslag remelting;
- slag;
- titanium dioxide;
- viscosity;
- structure

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References

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Effect of TiO₂ on the viscosity and structure of low-fluoride slag used for electroslag remelting of Ti-containing steels

中文摘要

Effect of TiO₂ on the viscosity and structure of low-fluoride slag used for electroslag remelting of Ti-containing steels

Abstract

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