Investment Casting:

Investment casting procedure is also known as 'lost wax' process. In this procedure ceramic slurry is applied around a disposable pattern, usually made up of wax and it is permitted to harden to build a disposable casting mould. The term 'investment casting' derived through the procedure of investing (that is coating or surrounding) a wax pattern along a refractory. The term 'lost wax' comes through the fact that the wax pattern is burned off throughout the process. The mould is heated up at temperature above 100^oC based on the type of cavity to eliminate wax from the mould. It forms the primary cavity (mold cavity) in the invested refractory. In this procedure a separate pattern is made up for each casting and gating system that is 100 castings needs 100 patterns .The patterns are cast by injection molding.