High pressure isostatic densification process

Details High pressure isostatic densification process High pressure isostatic densification process

1991-11-01

1992-09-29

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Metal and nonmetal in final product

419 14, 419 15, 419 16, 419 17, 419 6, 419 47, 419 57, 419 60, G22F 500

Patent

active

051512475

ABSTRACT:
The present invention is a method for densifying powder metallurgical parts to 100% theoretical density. The method comprises applying a high pressure of 0.1-100 MPa during sintering in a high pressure furnace at a temperature before which the liquid phase is formed and maintaining this pressure during the rest of the sintering cycle until the furnace has cooled to almost room temperature. The method achieves rapid, complete closure of the porosity which results in parts with close dimensional tolerances and practically no warpage.

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