US4615952A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aluminum shapes coated with brazing material and process of coating
Assignee: Norsk Hydro ASA
•
Filing: 1984-01-16
•
Granted: 1986-10-07
•
Expires: 2004-01-16
Abstract
Abstract An aluminum or aluminum alloy shape for manufacture of heat exchangers, coated with a metallic layer of a zinc-base alloy constituting a fluxless soldering or low temperature brazing material when heated. A process for direct coating of formed aluminum shapes in nascent state includes the steps of providing a non-reactive atmosphere around the shape, providing a coating material of zinc-base alloy and bringing the aluminum shape and the coating material into contact and maintaining the contact at an elevated temperature for a predetermined period of time for forming a coherent coating on the aluminum shape.
Inventors
- 👤 Richard Knoll
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:30
CPC Classifications
F; F28; F28F; F28F19/00; F28F19/02; F28F19/06; B; B21; B21C; B21C23/00; B21C23/009; B23; B23K; B23K1/00; B23K1/0008; B23K1/0012; B23K1/08; B23K1/20; B23K35/00; B23K35/22; B23K35/24; B23K35/28; B23K35/282; C; C23; C23C; C23C2/00; C23C2/04; C23C2/06; B23K2101/00; B23K2101/04; B23K2101/14; B23K2103/00; B23K2103/08; B23K2103/10; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/12771; Y10T428/12785; Y10T428/12792
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
160 words
A heat exchanger section having at least two bonded heat transfer surfaces and comprising at least one aluminum or aluminum alloy core defining a first said heat transfer surface and formed by a process in which said first heat transfer surface is formed substantially free of oxide, an outer layer of fluxless soldering material of zinc or zinc base alloy which has been deposited on said first heat transfer surface of said core in a thickness sufficient for acting as a fluxless solder, the deposition having been carried out with said soldering material in a molten state while the metal of said core is in a nascent state such that a portion of said soldering material which is toward said first heat transfer surface is diffused into said core and said soldering material is interbonded to said core, and at least one other member defining a second said heat transfer surface and bonded to said core by said soldering material.
Claim 2
Dependent Claim
160 words
A heat exchanger section having at least two bonded heat transfer surfaces and comprising at least one aluminum or aluminum alloy core defining a first said heat transfer surface and formed by a process in which said first heat transfer surface is formed substantially free of oxide, an outer layer of fluxless soldering material of zinc or zinc base alloy which has been deposited on said first heat transfer surface of said core in a thickness sufficient for acting as a fluxless solder, the deposition having been carried out with said soldering material in a molten state while the metal of said core is in a nascent state such that a portion of said soldering material which is toward said first heat transfer surface is diffused into said core and said soldering material is interbonded to said core, and at least one other member defining a second said heat transfer surface and bonded to said core by said soldering material.
Claim 3
Dependent Claim
38 words
A heat exchanger section as claimed in claim 1, wherein said core has been formed by a continuous forming process and said outer layer has been formed by a continuous deposition process in line with the forming process.
Claim 4
Dependent Claim
17 words
A heat exchanger section as claimed in claim 2, wherein said core is an extruded hollow shape.
Claim 5
Dependent Claim
38 words
A heat exchanger section as claimed in claim 2, wherein said core is a drawn hollow shape which has been subsequently heated up to a temperature equal to or higher than the melting point of said soldering material.
Claim 6
Dependent Claim
32 words
A heat exchanger section as claimed in claim 1, wherein said soldering material has been deposited at a temperature above the melting point of said soldering material and up to 840° F.
Claim 7
Dependent Claim
22 words
A heat exchanger section as claimed in claim 1, wherein the entire surface of said core is covered by said soldering material.
Claim 8
Independent Claim
179 words
A method of forming a heat exchanger section including at least two bonded heat transfer surfaces, said method comprising forming at least one aluminum or aluminum alloy core defining a first said heat transfer surface by a process in which said first heat transfer surface in a nascent state is kept substantially free of oxide, depositing an outer layer of fluxless soldering material of zinc or zinc base alloy on said first heat transfer surface of said core in a molten state while the metal of said first heat transfer surface is in the nascent state, thereby causing said soldering material to diffuse into the metal of said core and interbond said soldering material to said metal of said core, the depositing being in a thickness sufficient for acting as a fluxless solder, and bonding at least one other member defining a second said heat transfer surface to said core by said soldering material by bringing said surfaces into contact with each other for a period of time at a temperature above the melting point of said soldering material.
Claim 9
Independent Claim
179 words
A method of forming a heat exchanger section including at least two bonded heat transfer surfaces, said method comprising forming at least one aluminum or aluminum alloy core defining a first said heat transfer surface by a process in which said first heat transfer surface in a nascent state is kept substantially free of oxide, depositing an outer layer of fluxless soldering material of zinc or zinc base alloy on said first heat transfer surface of said core in a molten state while the metal of said first heat transfer surface is in the nascent state, thereby causing said soldering material to diffuse into the metal of said core and interbond said soldering material to said metal of said core, the depositing being in a thickness sufficient for acting as a fluxless solder, and bonding at least one other member defining a second said heat transfer surface to said core by said soldering material by bringing said surfaces into contact with each other for a period of time at a temperature above the melting point of said soldering material.
Claim 10
Dependent Claim
37 words
A method as claimed in claim 7, in which said forming of said core is by a continuous forming process and said outer layer is formed by a continuous deposition process in line with the forming process.
Claim 11
Dependent Claim
19 words
A method as claimed in claim 8, in which said forming of said core comprises extruding a hollow shape.
Claim 12
Dependent Claim
39 words
A method as claimed in claim 8, in which said forming of said core comprises drawing a hollow shape and subsequently heating it up to a temperature equal to or higher than the melting point of said soldering material.
Claim 13
Dependent Claim
29 words
A method as claimed in claim 7,in which said soldering material is deposited at a temperature above the melting point of said soldering material and up to 840° F.
Claim 14
Dependent Claim
23 words
A method as claimed in claim 7, in which said depositing step comprises depositing soldering material on the entire surface of said core.
References Cited (Backward Citations)
US722273A
Cited
US933433A
Cited
US2359926A
Cited
US2414312A
Cited
GB629425A
Cited
US2762115A
Cited
US2927856A
Cited
GB839864A
Cited
US2907105A
Cited
US3373482A
Cited
US3444022A
Cited
US3457630A
Cited
US3616982A
Cited
US3582478A
Cited
US3648356A
Cited
CH543923A
Cited
US3760481A
Cited
US3979042A
Cited
US4115604A
Cited
US3945554A
Cited
US4115607A
Cited
US4186474A
Cited
US4130232A
Cited
US4192162A
Cited
JPS5488842A
Cited
US4326662A
Cited
US4377024A
Cited
JPS57195579A
Cited
JPS58154456A
Cited
JPH0624209A
Cited
JPH0714471A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-10-06 | 1990-04-07 | 1990-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-10-06 | 1994-04-07 | 1994-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-10-06 | 1998-04-07 | 1998-10-07 | $7700.00 | Window Closed / Lapsed |