Arc discharge plasma (ADP) technology can be applied to disperse easily aggregated materials, such as the carbon nanotubes and Fe3O4. To investigate the evolution of the plasma arc channel and particle dispersion effect during the ADP process, a coupled electrode–plasma channel–workpiece (Fe3O4 clusters) and particle dispersion heat transfer model was established. The simulation results exhibited that the plasma arc formed at 0.05 s acted on the workpiece surface, forming a conical bottle-shaped structure with a wide arc column near the workpiece region and a narrow arc column near the electrode region due to the plasma column–workpiece interaction. With the continuous discharge, a discharge crater was formed on the workpiece surface due to the thermal-pressing effect of the plasma arc, and the dynamic pressure exerted by the arc column on the workpiece center increased continuously, driving the dispersion of the particles. In addition, ADP dispersion experiments were carried out on Fe3O4 to verify the simulation results. The experimental results showed that the morphologies of plasma arc channel evolution and discharge crater agreed with the simulation results. Moreover, the Fe3O4 particles dispersed by the ADP showed good dispersion morphology, which will further promote the spread of ADP technology in the dispersion and application of materials.

中文翻译：

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等离子弧通道演化与粒子弥散过程耦合数值模拟

电弧放电等离子体（ADP）技术可用于分散易聚集的材料，例如碳纳米管和Fe3O4。为了研究ADP过程中等离子弧通道和颗粒弥散效应的演变，建立了电极-等离子通道-工件（Fe3O4簇）和颗粒弥散耦合传热模型。仿真结果表明，0.05 s时形成的等离子弧作用于工件表面，由于等离子柱-工件的作用，在工件区域附近形成宽弧柱，在电极区域附近形成窄弧柱的锥形瓶状结构。相互作用。随着连续放电，由于等离子弧的热压作用，工件表面形成放电坑，电弧柱对工件中心施加的动压力不断增大，带动颗粒的弥散。此外，在Fe3O4上进行了ADP分散实验来验证模拟结果。实验结果表明，等离子弧通道演化和放电坑形貌与模拟结果一致。而且，ADP分散后的Fe3O4颗粒表现出良好的分散形貌，这将进一步推动ADP技术在材料分散和应用方面的推广。