Gold colored laminated composite material having magnetic properties
AssigneeThe International Nickel Company, Inc.
InventorsWalter A. Petersen, Jonathan A. Travis, Frank A. Badia
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Abstract
A novel laminated composite material of gold-colored appearance especially suited for, but not limited to, coinage applications has a ferromagnetic core located between sheathing layers of a Cu-Al or Cu-Ni-Al alloy and separated therefrom by layers of copper. Alternative methods involving hot and/or cold rolling techniques are provided for the production of the novel laminates.
Claims5
A pressure bonded composite material comprising a multi-layered laminate having a central core layer of ferromagnetic metal or alloy selected from the group consisting of nickel, iron and alloys thereof, the core layer representing from about 3.5% to about 85% of the thickness of the composite, a pair of intermediate layers of essentially pure copper, each layer representing from about 1% to about 6% of the thickness of the laminate, each intermediate layer being bonded to a respective one of opposed surfaces of the core, and a pair of gold colored sheathing layers, each of which is bonded remotely from said core to a respective surface of one of said intermediate layers, each layer having a thickness representing from about 5% to 45% of the thickness of the laminate, each of the sheathing layers consisting of an alloy which comprises, by weight:
- 0.5 to 10% Al, 0 to 9.5% Ni, the balance being copper in an amount of at least 85% and layer edges at least partially welded together to maintain the layers in their superimposed relationship to one another prior to the application of pressure.
Dependencies are inferred from the claim text.