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US4667871A
Expired / Lapsed
US
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Tin based ductile brazing alloys
Assignee: Osram Sylvania Inc
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Filing: 1986-10-03
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Granted: 1987-05-26
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Expires: 2006-10-03
Abstract
Abstract An alloy for brazing ceramic to a ceramic or a metal consists essentially of 35 to 95% tin, 0.5 to 70% silver, 0.5 to 20% copper, 0.1 to 4% titanium and/or vanadium and/or zirconium, 0 to 5% nickel, 0 to 2% chromium, all percentages by weight.
Inventors
- 👤 Howard Mizuhara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 01:45
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/02; B23K35/0222; B23K35/0233; B23K35/22; B23K35/24; B23K35/26; B23K35/262; B23K35/30; B23K35/3006
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
105 words
The method of joining two parts comprising a ceramic and a ceramic or metal comprising the steps of: preparing a composition essentially of 35 to 95% tin, 0.5 to 70% silver, 0.5 to 20% copper, 0.1 to 4% titanium and/or vanadium and/or zirconium, 0 to 5% nickel, 0 to 2% chromium, all percentages by weight; vacuum melting the composition and casting into a mold to form a brazing alloy ingot; rolling the brazing alloy ingot to a thin foil; disposing a suitable shape of the foil between the two parts to be joined; and vacuum melting the foil shape to braze the two parts together.
Claim 2
Independent Claim
105 words
The method of joining two parts comprising a ceramic and a ceramic or metal comprising the steps of: preparing a composition essentially of 35 to 95% tin, 0.5 to 70% silver, 0.5 to 20% copper, 0.1 to 4% titanium and/or vanadium and/or zirconium, 0 to 5% nickel, 0 to 2% chromium, all percentages by weight; vacuum melting the composition and casting into a mold to form a brazing alloy ingot; rolling the brazing alloy ingot to a thin foil; disposing a suitable shape of the foil between the two parts to be joined; and vacuum melting the foil shape to braze the two parts together.
Claim 3
Dependent Claim
24 words
The method of claim 1 where the vacuum melting braze step is effected at a temperature above the liquidus temperature of the brazing alloy.
Claim 4
Dependent Claim
12 words
The method of claim 1 where the first ceramic part comprises alumina.
Claim 5
Dependent Claim
13 words
The method of claim 1 where the first ceramic part comprises silicon nitride.
Claim 6
Dependent Claim
12 words
The method of claim 1 where the first ceramic part comprises zirconia.
Claim 7
Independent Claim
63 words
The method of preparing a ductile brazing alloy comprising the steps of preparing a composition consisting essentially of 35 to 95% tin, 0.5 to 70% silver, 0.5 to 20% copper, 0.1 to 4% titanium and/or vanadium and/or zirconium, 0 to 5% nickel, 0 to 2% chromium, all percentages by weight and vacuum melting the composition to form a single phase melt brazing alloy.
Claim 8
Independent Claim
63 words
The method of preparing a ductile brazing alloy comprising the steps of preparing a composition consisting essentially of 35 to 95% tin, 0.5 to 70% silver, 0.5 to 20% copper, 0.1 to 4% titanium and/or vanadium and/or zirconium, 0 to 5% nickel, 0 to 2% chromium, all percentages by weight and vacuum melting the composition to form a single phase melt brazing alloy.
Claim 9
Dependent Claim
28 words
The method of claim 6 including the steps of casting the brazing alloy into an ingot in sheet form and then rolling the sheet into a thin foil.
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) | 1990-05-25 | 1990-11-24 | 1991-05-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-05-25 | 1994-11-24 | 1995-05-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-05-25 | 1998-11-24 | 1999-05-26 | $7700.00 | Window Closed / Lapsed |