초록 ▼

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

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.

대표청구항 ▼

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 pa

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.