Abstract
The high temperature reaction of niobium pentoxide with niobium carbide and titanium carbide has been studied to investigate the feasibility of direct preparation of NbTi alloys and the titanium deoxidation tendency of niobium. Starting with oxide-carbide charges with o:c mole ratio varying from 1.01 to 1.10 and titanium content varying from 4 to 56 wt. pct., the reaction was carried out at 1900°C under high vacuum in a vacuum induction furnace followed by treatment in the electron beam melting furnace to obtain the final alloys. The material balance of the charge indicates that substantial amount of oxygen is removed as TiO(g) besides as CO during the reaction. This results in low titanium and oxygen contents and high residual carbon content in the alloy, particularly when the initial titanium content in the charge exceeds 4 wt. pct. The results obtained in the present investigation have been explained from the available/estimated thermodynamic data for the NbTiCO system.
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