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Purification of Hafnium by Hydrogen Plasma Arc Melting

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Figure

Fig. 1Schematic diagram of a plasma arc furnace used in this work.
Fig. 3Changes in the main impurity concentrations of the HP-Hf melted by 20%H2+Ar plasma arc, as a function of melting time.
Fig. 4Changes in Al, Fe, Cr, Ti, Sn and Mg concentrations of the LP-Hf during Ar and 20%H2+Ar plasma arc melting.
Fig. 6Dependence of the apparent reduction rate constant (k) of Al, Ti, Fe,Cr and Cu on the hydrogen content (%H2) of plasma arc during HPAM ofthe Hf-base dilute alloy.

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