Method of forming a composite material
AssigneeOlin Corporation
InventorsJoseph Winter, William Brenneman, Julius C. Fister
Life of this patent
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Abstract
Novel and advantageous metal laminates particularly useful in making coins comprising a copper core and a cladding metallurgically bonded thereto of a copper base alloy containing from 2 to 3.5% aluminum, from 1 to 2.5% silicon and the balance essentially copper. Disclosure also teaches a method of preparing copper laminates by providing a copper core in strip form in the hard temper and a copper alloy cladding fully annealed in strip form, wherein the components are rolled together in a single pass with a reduction of from 50 to 75% to provide the metallurgically bonded laminate.
Claims9
A method of forming a metallurgically firmly bonded composite material having a smooth external surface which comprises:
- providing a copper core material in strip form in the hard temper having a minimum strength of 51,000 psi yield strength at 0.2% offset;
- providing a copper alloy cladding in strip form being fully annealed to an average grain size of at least 10 microns and having a maximum strength of less than 15,000 psi yield strength at 0.2% offset;
- and rolling together said core and cladding in an unheated condition in a single pass with a reduction of 50 to 75% to provide a metallurgically firmly bonded composite.
Dependencies are inferred from the claim text.