Process for preparing hollow aluminum extrudates for use in vacu

Details Process for preparing hollow aluminum extrudates for use in vacu Process for preparing hollow aluminum extrudates for use in vacu

1988-06-13

1989-08-29

Combs, E. Michael

Metal deforming

With exposure of work to gas, vapor, mist, or modified...

722531, 72269, B21C 2300

Patent

active

048605654

ABSTRACT:
A process for preparing a hollow aluminum extrudate for use in a vacuum characterized in that dry air or pure oxygen is supplied to the hollow portion of the shaped material being extruded. During the extrusion, the inner surface of the extrudate defining the hollow portion is held out of contact with the atmospheric air containing water to form a compact oxide coating on the inner surface without permitting formation of any hydrated oxide coating.

REFERENCES:
patent: 4578973 (1986-04-01), Ishimaru et al.

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