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Commercial Zr, Nb and Ta have been purified by hydrogen plasma arc melting (HPAM) and the removal degree of impurities was compared with the results of thermodynamic estimations. In the case of Zr and Nb, 40–60% of the total amount of impurities was removed by Ar plasma melting and 60–80% by HPAM. The Ta melting by HPAM allowed to remove 80% of the total amount of impurities and to decrease the concentration...
Ar-H 2 plasma arc melting of Nb-based alloy revealed that elimination of Ti, Fe and Al has a diffusion nature, controlled by diffusion in the gas and, at lower Al and Fe concentrations, by diffusion in the metal. Hydrogen addition to the plasma gas resulted in a remarkably higher removal rate of the impurities. Shaking of the specimen is effective in accelerating the process at lower Al and...
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