Abstract
A new deoxidation in solid-state (DOSS) process was carried out in atmospheric-pressure argon to solve various difficulties associated with high-vacuum conditions, and the surface reaction and contact deoxidation mechanism were examined. The oxygen concentration of the Ti powder was decreased to 750 ppm at 800 °C by DOSS in atmospheric-pressure argon. Craters were formed on the surface of the deoxidized Ti powder, and the surface roughness increased. The craters were formed of Ca-Ti-O intermediate compounds during the reduction process and deoxidation. As the surface oxides of the Ti powder were reduced by deoxidation, the oxidation state decreased. When the deoxidation reaction reached equilibrium, the surface oxide was completely deoxidized, and the surface oxides were minimized upon re-passivation after pickling. As a result, the surface deoxidation reaction of the Ti powder was caused by the formation and decomposition of the Ca-Ti-O ternary compound on the surface.
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