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<p>The non-isothermal crystallization behavior of Ce<sub>2</sub>O<sub>3</sub> on SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub>-CaO-based mold flux was determined by TG-DSC (thermogravimetric analysis and differential scanning calorimetry), and the effects of Ce<sub>2</sub>O<sub>3</sub> on the crystallization temperature, crystallization rate, crystal growth index, and crystallization activation energy of SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub>-CaO-based mold flux were discussed based on the results of the JMA (Johnson–Mehl–Avrami) model. Meanwhile, the crystallization phases were analyzed using SEM–EDS (scanning electron microscope and energy-dispersive spectrometer) and XRD (X-ray diffraction). The results show that adding 10% Ce<sub>2</sub>O<sub>3</sub> component to the slag resulted in Ce<sub>9.33</sub>(SiO<sub>4</sub>)<sub>6</sub>O<sub>2</sub> replacing Ca<sub>4</sub>Si<sub>2</sub>O<sub>7</sub>F<sub>2</sub> as the main crystalline phase of the slag. At cooling rates of 5, 10, and 20&#xa0;K/min, the crystallization times of the slag without Ce<sub>2</sub>O<sub>3</sub> were 15.75, 10, and 7&#xa0;min, respectively. The crystallization times of the slag with Ce<sub>2</sub>O<sub>3</sub> added were 9.1, 6.55, and 5.75&#xa0;min, respectively. The addition of Ce<sub>2</sub>O<sub>3</sub> shortened the crystallization time of the slag and increased the nucleation rate. The crystal has a growth index range of 2.5–3.5, indicating that the crystalline phases Ce<sub>9.33</sub>(SiO<sub>4</sub>)<sub>6</sub>O<sub>2</sub> and Ca<sub>4</sub>Si<sub>2</sub>O<sub>7</sub>F<sub>2</sub> mainly grow in a two-dimensional manner, and their crystallization activity range is 18–27&#xa0;kJ/mol, indicating that their difficulty in crystallization is similar.</p>

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Effect of Ce2O3 on Non-isothermal Crystallization Behavior and Phase of SiO2-Al2O3-CaO-Based Mold Flux

  • 期刊论文

  • 发表日期：

    2025年12月7日

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  • Boyang Li,
  • Chenglin Zhao,
  • Xiangwei Liao,
  • Dejun Li

摘要

The non-isothermal crystallization behavior of Ce2O3 on SiO2-Al2O3-CaO-based mold flux was determined by TG-DSC (thermogravimetric analysis and differential scanning calorimetry), and the effects of Ce2O3 on the crystallization temperature, crystallization rate, crystal growth index, and crystallization activation energy of SiO2-Al2O3-CaO-based mold flux were discussed based on the results of the JMA (Johnson–Mehl–Avrami) model. Meanwhile, the crystallization phases were analyzed using SEM–EDS (scanning electron microscope and energy-dispersive spectrometer) and XRD (X-ray diffraction). The results show that adding 10% Ce2O3 component to the slag resulted in Ce9.33(SiO4)6O2 replacing Ca4Si2O7F2 as the main crystalline phase of the slag. At cooling rates of 5, 10, and 20 K/min, the crystallization times of the slag without Ce2O3 were 15.75, 10, and 7 min, respectively. The crystallization times of the slag with Ce2O3 added were 9.1, 6.55, and 5.75 min, respectively. The addition of Ce2O3 shortened the crystallization time of the slag and increased the nucleation rate. The crystal has a growth index range of 2.5–3.5, indicating that the crystalline phases Ce9.33(SiO4)6O2 and Ca4Si2O7F2 mainly grow in a two-dimensional manner, and their crystallization activity range is 18–27 kJ/mol, indicating that their difficulty in crystallization is similar.