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<p>The crystallization kinetics and structural characteristics of the CaF<sub>2</sub>–CaO–Al<sub>2</sub>O<sub>3</sub>–B<sub>2</sub>O<sub>3</sub> system for electroslag remelting (ESR) are investigated through the employment of differential scanning calorimetry (DSC). Additionally, it explains its changes from a microscopic perspective. The results demonstrate that with increasing B<sub>2</sub>O<sub>3</sub> content in the slag, the liquidus temperature gradually decreases. Furthermore, the crystallization rate shows a trend of first increasing and then decreasing. For the liquidus temperature, it is worth noting that when the B<sub>2</sub>O<sub>3</sub> content increases to 10&#xa0;mass&#xa0;pct, the liquidus suddenly drops. This is because the crystalline phase has changed. The crystallization rate is affected by the increase in free F<sup>−</sup> content and the increase in viscosity. According to the crystallization kinetics calculations, the following conclusions can be drawn: When the B<sub>2</sub>O<sub>3</sub> content ranges from 2 to 8&#xa0;mass&#xa0;pct, the primary crystal phase is CaF<sub>2</sub>, crystallization mechanism is diffusion controlled, three-dimensional growth with constant nucleation rate. However, when the B<sub>2</sub>O<sub>3</sub> content increases to 10&#xa0;mass&#xa0;pct, the primary crystal phase becomes CaF<sub>2</sub> and precipitates together with Ca<sub>12</sub>Al<sub>14</sub>O<sub>32</sub>F<sub>2</sub>. The emergence of new crystalline phases gives rise to new crystallization behavior. The crystallization mechanism of Ca<sub>12</sub>Al<sub>14</sub>O<sub>32</sub>F<sub>2</sub> is interface reaction controlled, one-dimensional growth with constant nucleation rate.</p>

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Crystallization Kinetics and Microstructure of CaF2–CaO–Al2O3–B2O3 Slag of Electroslag Remelting

  • 期刊论文

  • 发表日期：

    2025年12月12日

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  • Zhaolong Xu,
  • Ximin Zang,
  • Jie Yang,
  • Lingzhong Kong

摘要

The crystallization kinetics and structural characteristics of the CaF2–CaO–Al2O3–B2O3 system for electroslag remelting (ESR) are investigated through the employment of differential scanning calorimetry (DSC). Additionally, it explains its changes from a microscopic perspective. The results demonstrate that with increasing B2O3 content in the slag, the liquidus temperature gradually decreases. Furthermore, the crystallization rate shows a trend of first increasing and then decreasing. For the liquidus temperature, it is worth noting that when the B2O3 content increases to 10 mass pct, the liquidus suddenly drops. This is because the crystalline phase has changed. The crystallization rate is affected by the increase in free F− content and the increase in viscosity. According to the crystallization kinetics calculations, the following conclusions can be drawn: When the B2O3 content ranges from 2 to 8 mass pct, the primary crystal phase is CaF2, crystallization mechanism is diffusion controlled, three-dimensional growth with constant nucleation rate. However, when the B2O3 content increases to 10 mass pct, the primary crystal phase becomes CaF2 and precipitates together with Ca12Al14O32F2. The emergence of new crystalline phases gives rise to new crystallization behavior. The crystallization mechanism of Ca12Al14O32F2 is interface reaction controlled, one-dimensional growth with constant nucleation rate.