<prompt> Titanium casting is doneUnder vacuum in argon atmosphereUnder air pressure in nitrogen atmosphereIn specially fabricated aluminium vanadium crucibleUsing CAD-CAM technique  <response>: 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 