Nitride Intermediates in the Preparation of Columbium, Vanadium, and Tantalum Metals. (In Two Parts). 2. Thermal Decomposition of the Nitrides.
Guidotti-RA; Atkinson-GB; Kesterke-DG
NTIS: PB 250 694 :15 pages
The federal Bureau of Mines studied the thermal decomposition of the nitrides of the group V a metals (cbn, ta3n5, and vn) with the goal of preparing high-purity metals. Solid-state purification and arc and electron-beam melting were examined. Electron-beam melting proved to be the most efficient means of nitrogen and oxygen removal. Columbium and tantalum of 99.9-Pct purity were prepared by this technique; in the case of vanadium, however, nitrogen could not be reduced below the solid-solution level.
IH; Report of Investigation;
NTIS Accession No.
NTIS: PB 250 694