Abstract:The removal of typical impurity from tungsten using electron beam melting was studied. The feasibility of electron beam melting purification of tungsten was investigated. The impurity removal kinetics of electron beam melting was analyzed, and the removal rate control mechanism of Fe, Si and Ti at the power of 110, 130, and 250 kW was obtained. The results show that various impurities can be removed from the tungsten matrix by electron beam melting except Mo, and the removal efficiency and saturated vapor pressure difference are closely related. Kinetics analysis of removal of impurities and electron beam melting experiment indicate that Si, Fe and Ti is controlled by liquid-gas interface mass transfer with the mass transfer coefficient of 0.21, 0.56, 0.11×10-4m/s at 110 kW, and 0.83, 3.04, 1.78×10-4 m/s at 130 kW, whereas 0.36, 2.37, 1.48×10-4 m/s at 250 kW, respectively.