Porous films and method of forming them
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United States of America Patent
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-
Aug 18, 1987
Grant Date -
N/A
app pub date -
Oct 10, 1985
filing date -
Oct 17, 1984
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An anodic aluminum oxide film (12) has a system of larger pores (14) extending in from one face (16) and interconnecting with a system of smaller pores (24) extending in from the other face (26). The film is made by anodizing an aluminum metal substrate, then reducing the applied voltage at a rate to permit partial or complete recovery of the oxide film, either continuously or incrementally in small steps down to a level preferably below 3 V, and separating the oxide film from the substrate.
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