Patent US4442968A successfully refreshed from Google Patents.
US4442968A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brazing filler metal composition and process
Assignee: Honeywell International Inc
•
Filing: 1982-10-21
•
Granted: 1984-04-17
•
Expires: 2002-10-21
Abstract
Abstract Disclosed is a brazing filler metal composition comprising, by weight, about 8% to 11% chromium, 2.0%-3.0% boron, 3.0%-4.5% silicon, 2.5%-4.0% iron, 7.0%-9.0% tungsten, a maximum of about 0.06% carbon and the remainder nickel. Further disclosed is a vacuum brazing process utilizing said filler metal composition.
Inventors
- 👤 John H. McMurray
- 👤 Jule Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:15
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/30; B23K35/3033
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
101 words
A vacuum brazing process comprising (a) applying a brazing filler metal composition to a hole in a subject base metal, said filler metal composition comprising, by weight, from about 8.0% to about 11.0% chromium, from about 2.0% to about 3.0% boron, from about 3.0% to about 4.5% silicon, from about 2.5% to about 4.0% iron, from about 7.0% to about 9.0% tungsten, a maximum of about 0.06% carbon, and the remainder nickel, and said subject base metal having a higher melting point than said filler metal composition; (b) heating to the brazing temperature of the filler metal composition; and (c) cooling.
Claim 2
Dependent Claim
101 words
A vacuum brazing process comprising (a) applying a brazing filler metal composition to a hole in a subject base metal, said filler metal composition comprising, by weight, from about 8.0% to about 11.0% chromium, from about 2.0% to about 3.0% boron, from about 3.0% to about 4.5% silicon, from about 2.5% to about 4.0% iron, from about 7.0% to about 9.0% tungsten, a maximum of about 0.06% carbon, and the remainder nickel, and said subject base metal having a higher melting point than said filler metal composition; (b) heating to the brazing temperature of the filler metal composition; and (c) cooling.
Claim 3
Dependent Claim
36 words
The brazing process of claim 1 wherein said filler metal composition comprises, by weight, about 10% chromium, about 2.5% boron; about 4.0% silicon; about 3.5% iron; about 8.0% tungsten; about 0.04% carbon and the remainder nickel.
Claim 4
Dependent Claim
15 words
The brazing process of claim 1 wherein said subject base metal is a nickel-base superalloy.
Claim 5
Dependent Claim
24 words
The brazing process of claim 1 wherein the brazing temperature of said filler metal composition is from about 1,940° F. to about 1,960° F.
Claim 6
Dependent Claim
19 words
The brazing process of claim 1 wherein the brazing temperature of said filler metal composition is about 1,950° F.
Claim 7
Dependent Claim
19 words
The brazing process of claim 3 wherein the brazing filler metal is overcoated with coatings used for nickel superalloys.
Claim 8
Dependent Claim
26 words
The brazing process of claim 3 wherein a thin layer of nickel is plated into said hole prior to application of said brazing filler metal composition.
Claim 9
Dependent Claim
55 words
The brazing process of claim 3 wherein the brazing assembly is (a) heated to about 1,740° F. and held for about 1 hour; (b) heating is then continued to the brazing temperature and held for about 5 minutes; and (c) the temperature is then reduced to about 1,800° F. and held to about 3 hours.
Claim 10
Dependent Claim
14 words
The brazing process of claim 8 wherein said brazing temperature is about 1,950° F.
References Cited (Backward Citations)
US3024109A
Cited
US3632319A
Cited
US3678570A
Cited
US4008844A
Cited
US4078977A
Cited
JPS555173A
Cited
US4285459A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-04-17 | 1987-10-17 | 1988-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-04-17 | 1991-10-17 | 1992-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-04-17 | 1995-10-17 | 1996-04-17 | $7700.00 | Window Closed / Lapsed |