Isostatic processing with shrouded melt-away mandrel

Details Isostatic processing with shrouded melt-away mandrel Isostatic processing with shrouded melt-away mandrel

1990-06-20

1991-11-19

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Consolidation of powder prior to sintering

419 49, 419 68, B22F 100

Patent

active

050664549

ABSTRACT:
A melt-away mandrel is disclosed for use in an isostatic pressing process and a flexible sleeve is disclosed for use with the melt-away mandrel. The mandrel is used during pressing of compactible material and then the mandrel is melted away leaving the compacted part. Preferably the sleeve covers the mandrel and this assembly is loaded along with a material charge in a cold isostatic pressing apparatus. The sleeve protects the powder charge from contamination from the material of the mandrel. The isostatic pressing process for forming an uncontaminated part includes assembling the melt-away mandrel in the flexible sleeve, placing the sleeve and mandrel assembly in a containment vessel with the material charge, and submitting the material charge and sleeve and mandrel assembly to pressure for compacting the material charge against the sleeve. After the mandrel is melted, the sleeve is peeled away from the pressed material.

REFERENCES:
patent: 3907949 (1975-09-01), Carlson
patent: 4341557 (1982-07-01), Lizenby

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