Method for manufacturing billets, from metal powder, intended to

Details Method for manufacturing billets, from metal powder, intended to Method for manufacturing billets, from metal powder, intended to

1980-02-22

1983-02-01

Rutledge, L. Dewayne

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Special medium during sintering

419 52, 419 1, B22F 314

Patent

active

043713963

ABSTRACT:
A method for manufacturing billets intended to be subsequently machined into a desired shape by plastic deformation, as by rolling, includes the heating to a predetermined bonding temperature of powder grains enclosed in a capsule, and subjecting the capsule at the bonding temperature to a high pressure sufficient to bond the powder grains together to form a substantially solid body. The capsule is inserted at the bonding temperature into an over-sized forming cavity of a press which includes relatively movable punches, the capsule being completely surrounded within the press by a layer of heat-insulating and pressure-transmitting solid material, such as talc or the like. Thus, when the capsule is subjected to the high pressure upon operation of the press, such material serves as a pressure-transmitting medium through which pressure is applied completely against all sides of the capsule.

REFERENCES:
patent: 3284195 (1966-11-01), Googin
patent: 3356496 (1967-12-01), Hailey
patent: 3689259 (1972-09-01), 75
patent: 3767371 (1973-10-01), Wentorf
patent: 3982911 (1976-09-01), Lee
patent: 4041123 (1977-08-01), Lange
patent: 4234661 (1980-11-01), Lee
Powder Metallurgy Equipment Manual, Metal Powder Industries Federation, 1977, pp. 21-23.
Powder Metallurgy, 1958, Nos. 1, 2, pp. 94-103, J. Williams.
F. F. Lange et al., The Powder Vehicle Hot--Pressing Technique, 11/4/72, pp. 563 to 565.

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