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Electron Beam Suspension Zone Melting And Purification Of Niobium

2024-01-05 18:00:06

As we all know, in the purification and refining of niobium, the electron beam suspension zone smelting (EBFZM process actually only plays a small role. The main mechanism of its purification is the volatilization of metal impurities and the good removal of gas impurities. The electron beam of niobium is carried out. During beam suspension zone smelting, the vacuum degree is quite high, generally up to 10 Pa. The zone speed is also quite slow, about 16 ~ 25μ m/s, in the electrolysis process, the enrichment of Fe, Al, Cr, Co can be used in the smelting process A large amount of volatile is removed.

However, electron beam levitation zone melting also has the same disadvantage as electron beam melting, which is that Ta and W are poorly removed or even increased. For this reason, the Ta and V% in the raw materials should also be removed before purifying by the electron beam suspension zone melting process. In addition, the effect of the electron beam suspension zone melting process on the removal of interstitial impurities is not as good as expected. It may be that the melting zone of the electron beam suspension zone melting process is formed in a small space surrounded by a shielding ring of Ta or Hf. Under this condition, there must be a protective layer of Nb atoms formed by the evaporation of the main metal Nb. It may not interact with the residual gas molecules in the vacuum environment. Although the degassing kinetic and thermodynamic conditions of the melting zone are better than those of the solid zone, the lowest gas content in the solid zone after degassing will depend on the heating of the niobium bar and the residual gas The degree of interaction between. Generally, when using the electron beam suspension area to melt, the residual gas partial pressure is too high (>10*Pa), so that the interstitial impurity content cannot be reduced to below 1x10+%. Therefore, if the high-purity niobium processed by the electron beam suspension zone melting process has higher requirements for interstitial impurities, it is best to perform ultra-high vacuum annealing and degassing.

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