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研究了电子束熔炼提纯钨过程中典型杂质的脱除,考察了电子束熔炼提纯钨的可行性,对电子束熔炼过程中的除杂动力学进行了分析,并确定了110、130、250 kW功率条件下杂质Fe、Si、Ti的脱除速率控制机制。结果表明:除Mo外,电子束熔炼对基体钨中各种杂质均有不同程度的脱除,其脱除率与饱和蒸气压差存在对应关系;通过分析并结合电子束熔炼实验,确定了Si、Fe、Ti在110 kW时的传质系数分别为0.21、0.56、0.11×10-4 m/s,在130 kW时的传质系数分别为0.83、3.04、1.78×10-4 m/s,在250 kW时的传质系数分别为0.36、2.37、1.48×10-4 m/s,表明其脱除速率控制机制均为液/气界面中的扩散。
The removal of typical impurities during the purification of tungsten by electron beam smelting was studied. The feasibility of electron beam smelting to purify tungsten was investigated. The kinetics of impurity removal during electron beam smelting was analyzed. The 110,130,250 kW Controlling Mechanism of Removal Rate of Fe, Si, Ti Impurity under Power Condition. The results show that all of the impurities in the matrix tungsten are removed by electron beam smelting in addition to Mo, and the removal rate has a corresponding relationship with the saturated vapor pressure difference. By analyzing and combining electron beam melting experiments, the Si The mass transfer coefficients of Fe and Ti at 110 kW were 0.21, 0.56 and 0.11 × 10-4 m / s, respectively. The mass transfer coefficients at 130 kW were 0.83, 3.04 and 1.78 × 10-4 m / s, respectively. The mass transfer coefficients at 250 kW were 0.36, 2.37 and 1.48 × 10-4 m / s, respectively, indicating that the removal rate control mechanism is diffusion in the liquid / gas interface.