Method of forming a thin unbacked metal foil

Details Method of forming a thin unbacked metal foil Method of forming a thin unbacked metal foil

B - Operations, Transporting

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D

22/154

B22D 23/00 (2006.01) C23C 14/00 (2006.01)

Patent

CA 1196469

ABSTRACT OF THE DISCLOSURE A method of forming a thin (<2 µm) unbacked metal foil having a desired curviplanar shape is disclosed. In accordance with the method, a soluble polymeric film, preferably comprising polyvinyl alcohol, is formed on a supporting structure having a shape that defines the de- sired shape of the foil product. A layer of metal foil is deposited onto one side of the soluble film, preferably by vacuum vapor deposition. The metallized film is then im- mersed in a suitable solvent to dissolve the film and thereby leave the metal foil as an unbacked metal foil element mounted on the supporting structure. Aluminum foils less than 0.2 µm (2,000 A) thick and having an areal density of less than 54 µg/cm2 have been obtained.

420041

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