Titanium casting is done
Titanium has a high melting point (1668 °C) and high rate of oxidation above 900 °C. It requires a special casting machine with arc-melting capability and an argon atmosphere along with a casting investment consisting of oxides, such as MgO, ZrO2, or Y2O3, which are more stable than titanium oxide, to ensure acceptable castability.
Phillips 12th edition page 376
Under vacuum in argon atmosphere
Under air pressure in nitrogen atmosphere
In specially fabricated aluminium vanadium crucible
Using CAD-CAM technique