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Wetting Behavior of TiO2 by Calcium Ferrite Slag at 1523 K

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Abstract

The wetting behaviors of a TiO2 substrate by calcium ferrite (CF) series slags were investigated using an improved sessile drop method at 1523 K (1250 °C). The initial contact angles were in the range 35 to 50 deg, the final equilibrium apparent contact angles were < 20 deg, and the spreading durations were in the range 75 to 180 seconds. The CF-TiO2 system showed reactive wetting, which was categorized into four dynamic stages. Stage I: physical spreading, stage II: slow linear spreading, stage III: fast linear spreading, and stage IV: equilibrium. Interfacial reactions yielded CaTiO3 during reactive spreading, thereby transitioning TiO2 wetting into CaTiO3 wetting and then forming Fe2TiO5 and FeTiO3 owing to the excess Fe2O3 and FeO that had accumulated in the interfacial zone. Although stage III spreading was faster than stage II spreading, adding MgO to the slag slowed stage III spreading. The interfacial microstructure of the residual slag was roughly divided into three layers owing to the different densities of the slag and solid products. The top layer was composed of CaTiO3 and Fe2O3, the middle one was composed of CaTiO3 and Fe2TiO5, and the bottom one was composed of Fe2TiO5 and FeTiO3. Adding TiO2 to the slag produced a dense CaTiO3-containing interfacial layer, resulting in CF being detected in the residual slag.

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Acknowledgments

This work was supported by the Natural Science Fund outstanding youth project funding (No. 51522403) and Chongqing Youth Science and Technology Talent Training Project (cstc2014kjrc-qnrc90001).

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Authors and Affiliations

  1. School of Materials Science and Engineering, Chongqing University, No. 174 Shazhengjie, Shapingba, Chongqing, 400044, China

    Mingrui Yang, Xuewei Lv, Ruirui Wei & Chenguang Bai

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  1. Mingrui Yang
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  2. Xuewei Lv
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Correspondence to Xuewei Lv.

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Manuscript submitted October 31, 2017.

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Yang, M., Lv, X., Wei, R. et al. Wetting Behavior of TiO2 by Calcium Ferrite Slag at 1523 K. Metall Mater Trans B 49, 2667–2680 (2018). https://doi.org/10.1007/s11663-018-1360-2

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