US4431465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brazing alloy paste
Assignee: Osram Sylvania Inc
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Filing: 1982-08-02
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Granted: 1984-02-14
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Expires: 2002-08-02
Abstract
Abstract An improved brazing alloy paste comprises a brazing alloy powder mixed with a ductile metal spacer powder comprised of spherical particles with a predetermined diameter limit and having a higher melting temperature than that of the alloy, both powders being suspended in a gel-like substance. This composite paste produces a brazed joint having a gap with a controlled width and the ductile metal absorbs stresses developed between dissimilar brazed parts as when a tungsten carbide tool bit and the supporting steel shank cool after they are brazed together. The quantity of spherical spacer powder in the mixture is limited to 1-8% by weight of the mixture, preferably 5%, in order to prevent stacking of the spheres and to insure a gap spacing determined by the diameter of the spheres.
Inventors
- 👤 Howard Mizuhara
- 👤 Surya Pattanaik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:57
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/02; B23K35/0222; B23K35/0244; B23K35/025; B23K35/22; B23K35/24; B23K35/30; B23K35/3006; B23K35/302
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
62 words
A brazing alloy paste for joining cemented carbide and steel objects comprising a mixture of a brazing alloy powder having a nickel-copper-manganese composition and a gel consisting of a water soluble resin and a plurality of iron spheres consisting essentially of 1-8% by weight of the metal components of the paste, said spheres having a diameter in the range of 177-500 microns.
Claim 2
Dependent Claim
62 words
A brazing alloy paste for joining cemented carbide and steel objects comprising a mixture of a brazing alloy powder having a nickel-copper-manganese composition and a gel consisting of a water soluble resin and a plurality of iron spheres consisting essentially of 1-8% by weight of the metal components of the paste, said spheres having a diameter in the range of 177-500 microns.
Claim 3
Dependent Claim
33 words
The paste according to claim 1 in which said spheres consist essentially of 5% by weight of the metal components of the paste and have a diameter in the range of 250-296 microns.
Claim 4
Dependent Claim
59 words
A brazing alloy paste for joining metal objects comprising a mixture of a brazing alloy powder having a copper composition and a gel consisting of a water soluble resin and a plurality of iron spheres consisting essentially of 1-8% by weight of the metal components of the paste, said spheres having a diameter in the range of 177-500 microns.
Claim 5
Dependent Claim
59 words
A brazing alloy paste for joining metal objects comprising a mixture of a brazing alloy powder having a copper composition and a gel consisting of a water soluble resin and a plurality of iron spheres consisting essentially of 1-8% by weight of the metal components of the paste, said spheres having a diameter in the range of 177-500 microns.
Claim 6
Dependent Claim
33 words
The paste according to claim 3 in which said spheres consist essentially of 3% by weight of the metal components of the paste and have a diameter in the range of 250-297 microns.
Claim 7
Dependent Claim
59 words
A brazing alloy paste for joining a metal object to metallized alumina comprising a mixture of a silver-copper eutectic alloy powder and a gel consisting of a water soluble resin and a plurality of nickel spheres consisting of 1-8% by weight of the metal components of the paste, said spheres having a diameter in the range of 250-297 microns.
Claim 8
Dependent Claim
59 words
A brazing alloy paste for joining a metal object to metallized alumina comprising a mixture of a silver-copper eutectic alloy powder and a gel consisting of a water soluble resin and a plurality of nickel spheres consisting of 1-8% by weight of the metal components of the paste, said spheres having a diameter in the range of 250-297 microns.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-13 | 1987-08-15 | 1988-02-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-13 | 1991-08-15 | 1992-02-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-13 | 1995-08-15 | 1996-02-14 | $7700.00 | Window Closed / Lapsed |