Patent US4500028A successfully refreshed from Google Patents.
US4500028A
Expired / Lapsed
US
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Method of forming a composite material having improved bond strength
Assignee: Olin Corp
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Filing: 1983-10-28
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Granted: 1985-02-19
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Expires: 2003-10-28
Abstract
Abstract A composite material having improved bond strength and a substantially smooth external surface comprises a deoxidized copper alloy core material and a copper-aluminum-silicon clad material. The composite is formed by rolling together the core and clad, preferably in an unheated condition, in a single pass with a reduction of about 50% to 75% to form a metallurgical bond between the core and clad and thereafter enhancing the bond strength by heating the bonded core and cladding to a temperature in the range of about 200° C. to about 750° C. for a time period of about 5 minutes to about 24 hours.
Inventors
- 👤 John F. Breedis
- 👤 Julius C. Fister
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:40
CPC Classifications
B; B32; B32B; B32B15/00; B32B15/01; B23; B23K; B23K20/00; B23K20/22; B23K20/233; H; H05; H05K; H05K1/00; H05K1/02; H05K1/03; H05K1/05
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
135 words
A method of forming a composite sheet material having improved bond strength and a substantially smooth external surface, said method comprising: providing a core material in strip form comprising a deoxidized copper alloy consisting essentially of at least 95% by weight copper and from about 0.05% to about 0.5% zirconium; providing a cladding material in strip form comprising a dissimilar copper alloy; rolling together said core and cladding materials in a single pass with a reduction of about 50% to 75% to form a metallurgical bond between said core and cladding materials; and heating said bonded core and cladding materials to a temperature in the range of about 200° C. to about 750° C. for a time period of about 5 minutes to about 24 hours to increase the bond strength of said composite material.
Claim 2
Independent Claim
135 words
A method of forming a composite sheet material having improved bond strength and a substantially smooth external surface, said method comprising: providing a core material in strip form comprising a deoxidized copper alloy consisting essentially of at least 95% by weight copper and from about 0.05% to about 0.5% zirconium; providing a cladding material in strip form comprising a dissimilar copper alloy; rolling together said core and cladding materials in a single pass with a reduction of about 50% to 75% to form a metallurgical bond between said core and cladding materials; and heating said bonded core and cladding materials to a temperature in the range of about 200° C. to about 750° C. for a time period of about 5 minutes to about 24 hours to increase the bond strength of said composite material.
Claim 3
Dependent Claim
21 words
The method of claim 1 wherein said core providing step comprises: providing said core material in a low work hardened condition.
Claim 4
Dependent Claim
35 words
The method of claim 1 wherein said cladding providing step comprises: providing a copper alloy clad material consisting essentially of about 2 to 3.5% aluminum, about 1 to 2.5% silicon, and the balance essentially copper.
Claim 5
Dependent Claim
42 words
The method of claim 1 wherein said heating step comprises: heating said core and cladding material to a temperature in the range of about 400° C. to about 600° C. for a time period of about 30 minutes to about 1 hour.
Claim 6
Dependent Claim
19 words
The method of claim 1 further comprising: cladding said core material on two opposed surfaces with said cladding material.
Claim 7
Dependent Claim
25 words
The method of claim 1 further comprising: cold working said heat treated composite with a reduction up to 85% without substantially reducing said bond strength.
Claim 8
Dependent Claim
20 words
The method of claim 1 wherein said rolling step comprises: rolling said core and cladding together in an unheated condition.
Claim 9
Independent Claim
144 words
A method of forming a composite sheet material having improved bond strength and a substantially smooth external surface, said method comprising: providing a copper core material in strip form and in a low work hardened condition, said core material comprising a deoxidized copper alloy consisting essentially of from about 0.5% to about 0.15% zirconium and the balance essentially copper; providing a cladding material in strip form comprising a dissimilar copper alloy; rolling together said core and cladding materials in a single pass with a reduction of about 50% to 75% to form a metallurgical bond between said core and cladding materials; and heating said bonded core and cladding materials to a temperature in the range of about 200° C. to about 750° C. for a time period of about 5 minutes to about 24 hours to increase the bond strength of said composite material.
Claim 10
Independent Claim
144 words
A method of forming a composite sheet material having improved bond strength and a substantially smooth external surface, said method comprising: providing a copper core material in strip form and in a low work hardened condition, said core material comprising a deoxidized copper alloy consisting essentially of from about 0.5% to about 0.15% zirconium and the balance essentially copper; providing a cladding material in strip form comprising a dissimilar copper alloy; rolling together said core and cladding materials in a single pass with a reduction of about 50% to 75% to form a metallurgical bond between said core and cladding materials; and heating said bonded core and cladding materials to a temperature in the range of about 200° C. to about 750° C. for a time period of about 5 minutes to about 24 hours to increase the bond strength of said composite material.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-19 | 1988-08-20 | 1989-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-19 | 1992-08-20 | 1993-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-19 | 1996-08-20 | 1997-02-19 | $7700.00 | Window Closed / Lapsed |