초록 ▼

A method of manufacture of objects by consolidation of powdered metals, alloys, ceramics, or their mixtures is disclosed. The method comprises the steps of preparing a shaped, preferably ceramic, shell, placing it inside a metal or ceramic can, filling both the shell and space between the shell and

A method of manufacture of objects by consolidation of powdered metals, alloys, ceramics, or their mixtures is disclosed. The method comprises the steps of preparing a shaped, preferably ceramic, shell, placing it inside a metal or ceramic can, filling both the shell and space between the shell and the can with powder, outgassing and sealing the can if necessary, heating the full can and pressing it to consolidate the powder into a dense form; and separating the densified object within the shell from the densified shapes between the shell and the can. During pressing, the ceramic shell does not consolidate or bond to the surrounding powder, thus acting as an easy parting surface as well as being a shape defining container for the object being consolidated. The method permits easy definition of desired shell shape and permits manufacture of complex shaped, fully densified objects in near-net-shape form.

대표청구항 ▼

A process for manufacturing objects by consolidation of powdered materials of the type capable of being consolidated in powder metallurgy processes, the process comprising the steps of: filling a shell with a first powder composition of the type capable of being consolidated in powder metallurgy pro

A process for manufacturing objects by consolidation of powdered materials of the type capable of being consolidated in powder metallurgy processes, the process comprising the steps of: filling a shell with a first powder composition of the type capable of being consolidated in powder metallurgy processes, the first powder composition having a predetermined compressibility ratio, the shell being placed inside a can so that space is located between the shell and the can; filling the space between the shell and the can with a second powder composition of the type capable of being consolidated in powder metallurgy processes, the second powder composition having substantially the same compressibility ratio as the first powder composition; subjecting the can together with the shell included therein to elevated temperature and a pressure applied in one longitudinal direction only, the pressure and temperature being of sufficient magnitude to consolidate the first and second powder compositions, the shell being of a material which does not bond to the first powder composition, and disassembling the can and the shell which has been compacted in one direction as a result of the applied pressure to obtain an object consolidated from the first powder composition.