Patent JPS62239701A successfully refreshed from Google Patents.
US3979042A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Vacuum brazing of nickel to aluminum
Assignee: Raytheon Co
•
Filing: 1975-01-16
•
Granted: 1976-09-07
•
Expires: 1995-01-16
Abstract
Abstract A method for brazing nickel to aluminum in a vacuum and product produced thereby. The outer surface of the aluminum member to which the nickel member is to be brazed is precoated with a layer containing silicon and magnesium. The nickel and aluminum members are placed together in an oven at reduced pressures and heated to a temperature of approximately 593°C cracking the oxide coating upon the aluminum sheet. The presence of magnesium and silicon in the surface of the aluminum sheets makes possible an excellent braze with a large filleted area. The process may be further adapted for brazing other metal components to aluminum by first precoating the component with nickel.
Inventors
- 👤 Bruce J. Peters
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 15:46
CPC Classifications
B; B23; B23K; B23K1/00; B23K1/19; B23K1/0008; B23K1/0012; B23K35/00; B23K35/22; B23K35/24; B23K35/28; B23K35/286; F; F28; F28F; F28F1/00; F28F1/10; F28F1/12; F28F1/14; F28F1/22; F28D; F28D21/00; F28D2021/0019; F28D2021/0028; F28D2021/0029; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12486; Y10T428/12493; Y10T428/12736; Y10T428/1275; Y10T428/12764
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
58 words
The method comprising the steps of: providing members or predominantly nickel and aluminum or alloy of aluminum; assembling said members in a preferred configuration; providing a brazing material at junctures between said members, said brazing material comprising aluminum, silicon, and magnesium; providing a non-reactive atmosphere around the assembled members; and heating said members until a braze forms therebetween.
Claim 2
Independent Claim
58 words
The method comprising the steps of: providing members or predominantly nickel and aluminum or alloy of aluminum; assembling said members in a preferred configuration; providing a brazing material at junctures between said members, said brazing material comprising aluminum, silicon, and magnesium; providing a non-reactive atmosphere around the assembled members; and heating said members until a braze forms therebetween.
Claim 3
Dependent Claim
20 words
The method of claim 1 further comprising the step of lowering the temperature of said members at a predetermined rate.
Claim 4
Dependent Claim
21 words
The method of claim 2 wherein said non-reactive atmosphere comprises a partial vacuum of no more than 10 - 4 torr.
Claim 5
Dependent Claim
20 words
The method of claim 2 wherein said members are heated to a temperature in the range of 590°C to 596°C.
Claim 6
Independent Claim
123 words
The method comprising the steps of: providing one or more members each of predominantly nickel and aluminum or alloy of aluminum; assembling said members in a preferred configuration; providing brazing material at junctures between said members, said brazing material comprising 5 to 15% by weight silicon, 1 to 2% by weight magnesium, the remainder being aluminum; placing the assembled members in a vacuum furnace; lowering the pressure in said furnace to 10 - 4 torr or lower; raising the temperature of said members and brazing material to within the range of 590°C to 596°C; maintaining said temperature for a predetermined period of time; lowering said temperature to room temperature; raising said pressure to room pressure; and removing said members from said vacuum furnace.
Claim 7
Independent Claim
123 words
The method comprising the steps of: providing one or more members each of predominantly nickel and aluminum or alloy of aluminum; assembling said members in a preferred configuration; providing brazing material at junctures between said members, said brazing material comprising 5 to 15% by weight silicon, 1 to 2% by weight magnesium, the remainder being aluminum; placing the assembled members in a vacuum furnace; lowering the pressure in said furnace to 10 - 4 torr or lower; raising the temperature of said members and brazing material to within the range of 590°C to 596°C; maintaining said temperature for a predetermined period of time; lowering said temperature to room temperature; raising said pressure to room pressure; and removing said members from said vacuum furnace.
Claim 8
Dependent Claim
18 words
The method of claim 5 wherein said brazing material is preclad to said one or more aluminum members.
Claim 9
Dependent Claim
15 words
The method of claim 6 wherein said predetermined period of time is approximately two minutes.
Claim 10
Dependent Claim
14 words
The method of claim 6 wherein said one or more nickel members comprise tubing.
Claim 11
Dependent Claim
13 words
The method of claim 6 further comprising the step of precleaning said members.
Claim 12
Dependent Claim
12 words
The method of claim 9 wherein said members are precleaned with perchlorethylene.
Claim 13
Dependent Claim
20 words
The method of claim 6 wherein the step of lowering said temperature comprises lowering said temperature at a predetermined rate.
Claim 14
Dependent Claim
19 words
The method of claim 11 wherein said predetermined rate is chosen to minimize mechanical distortion of the brazed members.
Claim 15
Dependent Claim
139 words
A product having nickel and aluminum or alloy of aluminum members, said members being brazed together at junctures therebetween by the method comprising the steps of: providing said members of predominantly nickel and aluminum or alloy of aluminum; assembling said members in a preferred configuration; providing brazing material at said junctures, said brazing material comprising 5 to 15% by weight silicon, 1 to 2% by weight magnesium, the remainder being aluminum; placing the assembled members in a vacuum furnace; lowering the pressure in said furnace to 10 - 4 torr or lower; raising the temperature of said members and said brazing material to within the range of 590°C to 596°C; maintaining said temperature for a predetermined period of time; lowering said temperature to room temperature; raising said pressure to room pressure; and removing said members from said vacuum furnace.
Claim 16
Dependent Claim
139 words
A product having nickel and aluminum or alloy of aluminum members, said members being brazed together at junctures therebetween by the method comprising the steps of: providing said members of predominantly nickel and aluminum or alloy of aluminum; assembling said members in a preferred configuration; providing brazing material at said junctures, said brazing material comprising 5 to 15% by weight silicon, 1 to 2% by weight magnesium, the remainder being aluminum; placing the assembled members in a vacuum furnace; lowering the pressure in said furnace to 10 - 4 torr or lower; raising the temperature of said members and said brazing material to within the range of 590°C to 596°C; maintaining said temperature for a predetermined period of time; lowering said temperature to room temperature; raising said pressure to room pressure; and removing said members from said vacuum furnace.
Claim 17
Dependent Claim
24 words
The product of claim 13 wherein said product comprises a heat exchanger, said nickel members comprise tubing and said aluminum members comprise aluminum sheet.
Claim 18
Dependent Claim
17 words
The product of claim 14 wherein said aluminum sheet is preclad before brazing with said brazing material.
References Cited (Backward Citations)
US2920385A
Cited
US3375570A
Cited
US3703758A
Cited
US3373483A
Cited
US3482305A
Cited
US3675310A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-07 | 1980-03-08 | 1980-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-07 | 1984-03-08 | 1984-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-07 | 1988-03-08 | 1988-09-07 | $7700.00 | Window Closed / Lapsed |