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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

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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Acknowledgements

This work was financially supported by the Fundamental Research Funds for the Central Universities (Grant No. FRF-TP-15-010A2), and China Postdoctoral Science Foundation (Grant No. 2016T90035).

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Authors and Affiliations

  1. State Key Laboratory of Advanced Metallurgy, University of Science and Technology Beijing, Beijing, 100083, China

    Cheng-bin Shi, Ding-li Zheng & Jing Li

  2. Graduate Institute of Ferrous Technology, Pohang University of Science and Technology, Pohang, 790-784, Republic of Korea

    Seung-ho Shin & Jung-wook Cho

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Correspondence to Cheng-bin Shi.

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Shi, Cb., Zheng, Dl., Shin, Sh. et al. 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, 18–24 (2017). https://doi.org/10.1007/s12613-017-1374-9

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  • DOI: https://doi.org/10.1007/s12613-017-1374-9

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