Method of making pipes by powder metallurgy and pipe blanks (sem

Details Method of making pipes by powder metallurgy and pipe blanks (sem Method of making pipes by powder metallurgy and pipe blanks (sem

1984-11-05

1986-04-22

Lechert, Jr., Stephen J.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Making composite or hollow article

419 8, 419 68, 419 69, 428554, 428558, 428 36, B22F 700

Patent

active

045841705

ABSTRACT:
A method of making pipes by powder metallurgy, in which powder of metal and/or metal alloys (17) is filled into a thin-walled casing consisting of inner pipe wall (12), outer pipe wall (11) and a bottom (13), subsequently the casing is closed on its side remote from the bottom (13) by an annular cover (14) and is subjected to a cold-isostatic pressure whereby the powder (17) is compacted within the casing to produce a solid or dimensionally stable pipe blank or compact (10), which is then hot-worked, e.g. extruded. In order to prevent thermal cracks on the inner pipe or inner pipe wall (12), especially in the region of the ends thereof, the inner pipe or inner pipe wall (12) is provided prior to hot-working on at least one end region thereof with at least one circumferentially extending bulge (15 or 16, respectively).

REFERENCES:
patent: 4486385 (1984-12-01), Aslund

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