Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Metal and nonmetal in final product
Patent
1986-03-06
1987-06-16
Lechert, Jr., Stephen J.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Metal and nonmetal in final product
419 48, 419 49, 419 51, 264125, 264DIG36, B22F 700
Patent
active
046735496
ABSTRACT:
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.
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