| 摘要 |
PURPOSE: To easily produce a high-purity metallic material with good reproducibility by refining a crude metallic material consisting essentially of one kind of metal selected from among Ti, Zr and Hf by the iodide decomposition method and melting the refined metal with an electron beam in a high vacuum. CONSTITUTION: A crude metallic material consisting essentially of one kind among Ti, Zr and Hf, e.g. a crude Ti material, is charged into a reaction vessel 1 along with an iodine material and heated to 1100-1500 deg.C by energizing a filament 5 to keep the inside of the vessel 1 at 100-250 deg.C. Consequently, the crude Ti material reacts with the iodine material to form TiI4 which is again decomposed into Ti and iodine, and the Ti alone is deposited on the filament 5. The Ti material thus obtained is melted with an electron beam in a high vacuum of <=5×10<-5> mbar to remove AN, Na, K, etc. A high-purity metallic material contg. <=100ppm each of Fe, Nl and Cr and <=10ppm Al is obtained in this way.
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