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

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• 作者：Cheng-bin Shi ; Ding-li Zheng ; Seung-ho Shin…
• 关键词：electroslag remelting ; slag ; titanium dioxide ; viscosity ; structure
• 刊名：International Journal of Minerals, Metallurgy, and Materials
• 出版年：2017
• 出版时间：January 2017
• 年：2017
• 卷：24
• 期：1
• 页码：18-24
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science, general; Metallic Materials; Characterization and Evaluation of Materials; Ceramics, Glass, Composites, Natural Materials; Surfaces and Interfaces, Thin Films; Tribology, Corrosion
• 出版者：University of Science and Technology Beijing
• ISSN：1869-103X
• 卷排序：24

文摘

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 Ti₂O₆4− 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 Ti₂O₆4− 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.