Process for preparing hollow aluminum extrudates for use in vacuum
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United States of America Patent
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Aug 29, 1989
Grant Date -
N/A
app pub date -
Jun 13, 1988
filing date -
Jun 15, 1987
priority date (Note) -
Expired
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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.
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