Method of extruding refractory metals and alloys and an extruded

Details Method of extruding refractory metals and alloys and an extruded Method of extruding refractory metals and alloys and an extruded

1993-11-02

1995-08-29

Walsh, Donald P.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Consolidation of powder prior to sintering

419 5, 419 6, 419 26, 419 28, 419 39, 419 42, 419 53, 419 55, B22F 316

Patent

active

054457874

ABSTRACT:
The process of forming an extruded product of tantalum or niobium requires a cold isostatic pressing of a charge of the powder to a density sufficient to form a green compact which is then placed in a capsule. The capsule is then sealed and heated to a temperature and for a time sufficient to anneal the green compact. Thereafter, the capsule and encapsulated compact are subjected to a cold isostatic pressing to achieve a density of from 70% to 85%. This is followed by subsequent heating and extrusion of the heated capsule and encapsulated compact to form the extruded product. The outer layer on the capsule which has been formed by the capsule material can be removed, as by pickling, in the case of the capsule being a carbon steel.

REFERENCES:
patent: 4143208 (1979-03-01), Aslund
patent: 4150196 (1979-04-01), Aslund
patent: 4364162 (1982-12-01), Nilsson et al.
patent: 4647197 (1987-02-01), Wong
patent: 4710345 (1987-12-01), Doi et al.
patent: 4729789 (1988-03-01), Ide et al.
patent: 4734827 (1988-03-01), Wong
patent: 5080712 (1992-01-01), James et al.

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