Study on Preparation of High-purified Terbium and Dysprosium Metals Used for Rare Earth Giant Magnetostrictive Materials

Vacuum distillation technology purifying terbium and dysprosium metals has been researched in this paper,and some factors influencing purification process such as distillation temperature,distillation rate and so on were discussed.The result shows that the extraction rate of terbium and dysprosium metals is all above 97%,Tb(or Dy) /TREM ≥99.99%,totol rare earth metal impurity content 100μg/g,total non-rare earth metal impurity content 300μg/g,O200μg/g,N40μg/g,C70μg/g,and the high-purified terbium and dysprosium metals are good raw materials for rare earth giant magnetostrictive materials.