Abstract: The invention describes a method of casting a metal comprising the following steps: fabricating a pattern from polystyrene foam, coating the pattern with a ceramic slurry, filling sand around the pattern to create a sand mold, placing the sand mold in an open pressure vessel, filling the sand mold with a molten metal, immediately thereafter closing and pressure sealing the pressure vessel, pressurizing the sealed pressure vessel with an inert gas for a predetermined measured time, depressurizing the sealed pressure vessel, opening the pressure vessel and removing the metal filled sand mold, and extracting the desired object from the mold.

Abstract: The present invention describes a method of casting a metal alloy comprising forming a sand based mold having the geometry to generate a desired object to be cast, placing the mold in an open pressure vessel, filling the mold with a molten metal alloy, immediately thereafter closing and pressure sealing the pressure vessel, pressurizing the sealed pressure vessel with an inert gas for a measured time said predetermined measured time sufficient for the molten metal to cool and fully solidify, depressurizing the sealed pressure vessel and removing the metal filled sand mold, and extracting the desired object from the mold.

Abstract: The invention describes a method of casting a metal comprising the following steps: fabricating a pattern from wax or plastic having the geometry to generate a desired object, fabricating an investment mold from the wax, placing the mold in an open pressure vessel, filling the investment mold with a molten metal alloy, immediately thereafter closing and pressure sealing the pressure vessel, pressurizing the sealed pressure vessel with an inert gas for a predetermined measured time, depressurizing the sealed pressure vessel, opening the pressure vessel and removing the metal filled investment mold, and extracting the desired object from the investment mold.