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Crystallization Behavior of Calcium Silicate-Based Mold Flux Under Electropulsing Treatment with Different Pulse Duty Cycles

  • Characterization of Interactions between Materials and External Fields
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Abstract

Electropulsing treatment (EPT), as an external field technology, has the potential to adjust the crystallization of mold flux when it is locally applied in the casting mold. In this study, the effect of EPT with different pulse duty cycles on crystallization behavior of calcium silicate-based mold flux was investigated. The results show that the morphology of crystals precipitated in the mold flux transforms from elongated grains into block-like grains, with the average grain radius increasing from 14.1 ± 1.01 μm to 24.7 ± 2.07 μm when the duty cycle increases from 10% to 70%. Phase analyses show that the fraction of Ca2Mg0.75Al0.5Si1.75O7 in the mold flux increases from 11.2 wt.% to 14.7 wt.%, while that of Ca4Si2O7F2 decreases from 88.8 wt.% to 85.3 wt.% with the increase of the duty cycle. The variation of content of these phases is mainly due to their electrical conductivity, which leads to the enhancement of melilite and the inhibition of cuspidine precipitation when the electropulsing is applied.

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Acknowledgement

The work was supported by Natural Science Foundation of Hunan Province [grant numbers 2022JJ10081] and National Natural Science Foundation of China [grant number 52174327, U1760202].

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Authors and Affiliations

  1. School of Metallurgy and Environment, Central South University, Changsha, 410083, People’s Republic of China

    Wanlin Wang, Xiong Yan, Lejun Zhou, Houfa Wu & Xiaocan Zhong

  2. National Center for International Cooperation of Clean Metallurgy, Changsha, 410083, People’s Republic of China

    Wanlin Wang, Xiong Yan, Lejun Zhou, Houfa Wu & Xiaocan Zhong

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  1. Wanlin Wang
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  2. Xiong Yan
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Correspondence to Lejun Zhou.

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Wang, W., Yan, X., Zhou, L. et al. Crystallization Behavior of Calcium Silicate-Based Mold Flux Under Electropulsing Treatment with Different Pulse Duty Cycles. JOM 75, 5141–5148 (2023). https://doi.org/10.1007/s11837-023-06176-9

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  • DOI: https://doi.org/10.1007/s11837-023-06176-9

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