Powder metallurgy processes – Powder metallurgy processes with heating or sintering – Heat and pressure simultaneously to effect sintering
Patent
1987-03-20
1988-05-31
Lechert, Jr., Stephen J.
Powder metallurgy processes
Powder metallurgy processes with heating or sintering
Heat and pressure simultaneously to effect sintering
419 53, 419 56, B22F 100
Patent
active
047479990
ABSTRACT:
A method of powder metallurgically manufacturing an article with near net shape is disclosed, the method comprising
filling the mould cavity (3) of an open ceramic open mould (1), the inside walls of the cavity being precision copying cast surfaces (2), with fine particulate metal powder (5),
placing the mould with its content of metal powder in an outer mould (6), and covering the ceramic open mould containing the metal powder with a bed of finely distributed particulate pressure medium (7),
heating the bed of pressure medium and ceramic mould and particulate metal powder therein and subjecting the particulate pressure medium to pressure provided by at least one surface acting in an axial direction against the opening (4) of the ceramic mould, so that pressure is transferred by the particulate pressure medium to the metal powder in the mould to consolidate the metal powder to a completely dense body (21) with surfaces (22) which have been shaped by the precision cast surfaces of the mould cavity.
REFERENCES:
patent: 3689259 (1969-06-01), Hailey
patent: 3700435 (1971-03-01), Chandhok
patent: 4171339 (1979-10-01), Lee et al.
patent: 4389362 (1983-06-01), Larsson
patent: 4547337 (1985-10-01), Rozmus
S. Friberg, "HIP to Near Net Shape", Scandinavian Journal of Metallurgy 11 (1982), 223-225.
Lechert Jr. Stephen J.
Uddeholm Tooling Aktiebolag
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