Abstract Removal feasibility of Fe impurity form La metal by EBM was analyzed, the removal mechanism was discussed, and the verification experiments were carried out in this study. The research results indicated that, the evaporation coefficient of Fe in La metal is 35–175 at 1800–3000 K, and Fe impurity can be removed by EBM; the removal efficiency of Fe impurity was improved with the increasing EBM power, the Fe concentration was significantly decreased from 1482 to 0.1 μg/g under 50 kW and 2400 s; the reaction of Fe removal by EBM follows the first-order rate law, and Fe impurity was removed by evaporation as a single atom; transport from the La melt to the liquid boundary layer of the Fe atom is rate-controlling step in the EBM when the EBM power is 30–50 kW.

中文翻译：

---

电子束熔炼镧中铁杂质的去除机理

摘要 分析了EBM去除金属La中Fe杂质的可行性，探讨了去除机理，并进行了验证实验。研究结果表明，在1800-3000 K时，La金属中Fe的蒸发系数为35-175，EBM可以去除Fe杂质；随着EBM功率的增加，对Fe杂质的去除效率提高，在50 kW和2400 s下，Fe浓度从1482显着降低到0.1 μg/g；EBM脱铁反应遵循一级速率规律，铁杂质以单原子形式蒸发脱除；当 EBM 功率为 30-50 kW 时，从 La 熔体到 Fe 原子的液体边界层的传输是 EBM 中的速率控制步骤。