The present study investigates the possibility of the direct removal of oxygen from the Ti-30Ni
(wt per cent) alloy melt through the thermodynamic equilibrium reactions at 1623 K in the vertical
tube furnace. The deoxidation efficiency of Ti-Ni alloy melt by adding different contents of metallic
calcium (Ca) as a deoxidant was evaluated with the binary CaF2-MgCl2 flux.
The thermodynamic equilibrium experiments showed that the total oxygen content in the alloy
decreased from about 650 ppm to 350 ppm when 3.5 wt per cent Ca was added to the Ti-30Ni
(wt per cent) alloy.
Alternatively, the effect of flux composition in the CaF2-MgCl2 flux on the oxygen content was also
investigated at 1623 K. Therefore, the effect of binary flux systems on the deoxidation ability was
compared at 1623 K. According to the results, the flux system with 80 per centCaF2–
20 per centMgCl2 exhibited the best deoxidation capability, ie total oxygen content in the alloy
reduced from 1450 to 550 ppm.