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<p>The contact angle between CaO–Al<sub>2</sub>O<sub>3</sub>–MgO molten slag and Al<sub>2</sub>O<sub>3</sub> substrate under an applied voltage was measured using the sessile drop method at 1673 K. The effects of applied voltage on wetting behavior and spreading kinetics were investigated. The results indicated that as the applied voltage increases, both the contact angle and interfacial tension between molten slag and Al<sub>2</sub>O<sub>3</sub> substrate exhibit a decreasing trend, while the adhesion work value shows an increasing trend. The contact angle and interfacial tension of the negative applied voltage are observed to be marginally lower than those of the positive applied voltage. At low voltage (±&#xa0;1&#xa0;V), the effect of applied voltage on the dissolution of Al<sub>2</sub>O<sub>3</sub> substrate is limited. At high voltage (±&#xa0;6&#xa0;V), electrode reactions and bubble agitation significantly enhance the dissolution of Al<sub>2</sub>O<sub>3</sub> substrate, resulting in significantly increased corrosion. The process of spreading can be divided into following four stages, and the spreading index <Emphasis Type="BoldItalic">n</Emphasis> of each stage was calculated by the Tanner empirical model. In the initial stage (I), the spreading is mainly due to inertial force and the <Emphasis Type="BoldItalic">n</Emphasis> values are slightly greater than 10. In the rapid spreading stage (II), the spreading is jointly controlled by both reaction and diffusion mechanisms with the <Emphasis Type="BoldItalic">n</Emphasis> values ranging from 2.7 to 3.8. In the slow spreading stage (III), the <Emphasis Type="BoldItalic">n</Emphasis> values at low applied voltage are similar to that in the initial stage, and the <Emphasis Type="BoldItalic">n</Emphasis> values at higher applied voltage decrease significantly, approaching the diffusion-controlled reactive spreading index. In the final stage (IV), the driving force undergoes a transition from inertial to viscous forces, and the wetting achieves a new state of equilibrium. The applied voltage exerts a significant influence on the spreading index <Emphasis Type="BoldItalic">n</Emphasis> of stage (I) and stage (III), while its effect on the stage (II) is limited.</p>

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Wettability and Spreading Kinetics of CaO–Al2O3–MgO Molten Slag on Al2O3 Substrate with Applied Voltage

  • 期刊论文

  • 发表日期：

    2026年3月18日

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  • Rui Yin,
  • Chunsheng Xie,
  • Jifang Xu,
  • Minqi Sheng,
  • Hongwei Guo

摘要

The contact angle between CaO–Al2O3–MgO molten slag and Al2O3 substrate under an applied voltage was measured using the sessile drop method at 1673 K. The effects of applied voltage on wetting behavior and spreading kinetics were investigated. The results indicated that as the applied voltage increases, both the contact angle and interfacial tension between molten slag and Al2O3 substrate exhibit a decreasing trend, while the adhesion work value shows an increasing trend. The contact angle and interfacial tension of the negative applied voltage are observed to be marginally lower than those of the positive applied voltage. At low voltage (± 1 V), the effect of applied voltage on the dissolution of Al2O3 substrate is limited. At high voltage (± 6 V), electrode reactions and bubble agitation significantly enhance the dissolution of Al2O3 substrate, resulting in significantly increased corrosion. The process of spreading can be divided into following four stages, and the spreading index n of each stage was calculated by the Tanner empirical model. In the initial stage (I), the spreading is mainly due to inertial force and the n values are slightly greater than 10. In the rapid spreading stage (II), the spreading is jointly controlled by both reaction and diffusion mechanisms with the n values ranging from 2.7 to 3.8. In the slow spreading stage (III), the n values at low applied voltage are similar to that in the initial stage, and the n values at higher applied voltage decrease significantly, approaching the diffusion-controlled reactive spreading index. In the final stage (IV), the driving force undergoes a transition from inertial to viscous forces, and the wetting achieves a new state of equilibrium. The applied voltage exerts a significant influence on the spreading index n of stage (I) and stage (III), while its effect on the stage (II) is limited.