Purification of hafnium from oxygen and nitrogen

Abstract

Data on the influence content of interstitial impurities on the mechanical properties of hafnium are presented in this work. Investigations the purification of hafnium from oxygen at added of aluminum on the melting reduction stage with subsequent refining electron beam melting were performed. It is shown that vacuum thermal treatment of hafnium tetrafluoride before carrying out melting reduction reduces the nitrogen content in hafnium less than 0.005 wt.%.