US3740828A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for making stainless steel aluminum composite material
Assignee: Texas Instruments Inc
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Filing: 1971-05-28
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Granted: 1973-06-26
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Expires: 1991-05-28
Abstract
Abstract A process for metallurgically bonding stainless steel to aluminum at room temperature to provide a composite material having excellent formability properties and having a high quality stainless steel surface finish is shown to include the steps of squeezing strips of stainless steel and aluminum materials together between pressure bonding rolls while driving one roll in engagement with the stainless steel material at a selected peripheral speed, preferably without use of a lubricant between the roll and stainless steel material, and while regulating rotation of the other roll in engagement with the aluminum material at a relatively slower peripheral speed for reducing the thickness of at least the aluminum material to an extent sufficient to form incipient solid-phase metallurgical bonds between the materials, the bonded materials then being sintered in the solid-phase for increasing the strength of the metallurgical bonds between the stainless steel and aluminum materials.
Inventors
- 👤 J Buchinski
- 👤 C Zenuk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:37
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/04
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
57 words
A method as set forth in claim 1 wherein said stainless steel strip material has a surface finish at least as fine as No. 2B (AISI) prior to said bonding and said composite material is buffed after said bonding for providing said stainless steel material with a surface finish at least as fine as No. 2B (AISI).
Claim 2
Dependent Claim
80 words
A method as set forth in claim 1 wherein said stainless steel strip material is selected from the group consisting of the stainless steel alloys set forth in Table I in the specification hereof, which Table I is incorporated in this claim by this reference, wherein said aluminum strip material is selected from the group consisting of the aluminum alloys set forth in Table II in the specification hereof, which Table II is incorporated in this claim by this reference.
Claim 3
Independent Claim
231 words
A method for making a composite stainless steel-aluminum material suitable for use in making automotive trim and the like, said method comprising the steps of cleaning at least one surface of a strip of Type 434 Stainless Steel material in fully annealed condition and at least one surface of a strip of 3003 Aluminum Alloy material for removing bond-deterrent materials from said surfaces, interfacially contacting said strip surfaces with each other and squeezing said strip materials together at room temperature between a pair of pressure bonding rolls, rotatably driving at least one of said rolls in engagement with said stainless steel strip material with selected torque at a selected peripheral speed while regulating rotation of the other of said rolls in engagement with said aluminum strip material with relatively lower torque at a relatively slower peripheral speed for advancing said strip materials between said rolls with about 5 percent reduction in the thickness of said stainless steel material and with about 50 percent reduction in the thickness of said aluminum strip material to metallurgically bond said strip materials together to form an initially-bonded composite material, said engagement of said one roll with said stainless steel material being free of lubricant, and heating said initially-bonded composite material at a temperature of about 450* F. for about 30 minutes for improving the strength of said bond between said stainless steel and aluminum materials.
Claim 4
Independent Claim
260 words
A method for making a composite stainless steel-aluminum material suitable for use in making automotive trim and the like, said method comprising the steps of cleaning at least one surface of a strip of Type 434 Stainless Steel material in fully annealed condition and at least one surface of a strip of composite aluminum material embodying metallurgically bonded layers of 5052 Aluminum Alloy and C22 Aluminum Alloy for removing bond-deterrent materials from said surfaces, said cleaned surface of said composite aluminum strip material being formed by said C22 Aluminum Alloy, interfacially contacting said strip surfaces with each other and squeezing said strip materials together at room temperature between a pair of pressure bonding rolls, rotatably driving at least one of said rolls in engagement with said stainless steel strip material with selected torque at a selected peripheral speed while regulating rotation of the other of said rolls in engagement with said composite aluminum strip material with relatively lower torque at a relatively slower peripheral speed for advancing said strip materials between said rolls with about 3 percent reduction in the thickness of said stainless steel material and with about 50 percent reduction in the thickness of said aluminum strip material to metallurgically bond said strip materials together to form an initially bonded composite initially-bonded said engagement of said one roll with said stainless steel material being free of lubricant, and heating said initially-bonded composite material at a temperature of about 450* F. for about 30 minutes for improving the strength of said bond between said stainless steel and aluminum materials.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-25 | 1976-12-25 | 1977-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-25 | 1980-12-25 | 1981-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-25 | 1984-12-25 | 1985-06-26 | $7700.00 | Window Closed / Lapsed |