Patent US4026677A successfully refreshed from Google Patents.
US4026677A
Expired / Lapsed
US
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High temperature titanium braze foil
Assignee: RTX Corp
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Filing: 1975-02-13
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Granted: 1977-05-31
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Expires: 1995-02-13
Abstract
Abstract The diffusion brazing of members comprised of materials which are characterized by embrittlement as a result of exposure to excessive temperatures is accomplished with the aid of preforms consisting of a titanium-zirconium alloy foil coated with a plurality of eutectic depressant alloying agents. The depressant agents, in a preferred embodiment, are applied as layers and consist of beryllium and nickel. The preforms are sandwiched between surfaces to be joined and the resulting assemblies are heated in a non-reactive environment with light pressure loading whereby a liquid phase will result and diffusion of metal from the preform into the base metals will occur.
Inventors
- 👤 Francis S. Galasso
- 👤 Urban E. Kuntz
- 👤 Eugene J. Delgrosso
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:27
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/001; B23K35/005; B23K35/22; B23K35/24; B23K35/32; B23K35/325; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12729; Y10T428/12771; Y10T428/12806
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
57 words
A composite preform for use in diffusion brazing comprising: a titanium-zirconium foil; at least a first layer of nickel coated on at least a first surface of said foil; and a coating of beryllium formed over said nickel layer, the total preform composition consisting essentially of, by weight, 37-46% titanium, 37-46% zirconium, 2-6% beryllium and 4-24% nickel.
Claim 2
Dependent Claim
57 words
A composite preform for use in diffusion brazing comprising: a titanium-zirconium foil; at least a first layer of nickel coated on at least a first surface of said foil; and a coating of beryllium formed over said nickel layer, the total preform composition consisting essentially of, by weight, 37-46% titanium, 37-46% zirconium, 2-6% beryllium and 4-24% nickel.
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) | 1980-05-30 | 1980-11-29 | 1981-05-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-30 | 1984-11-29 | 1985-05-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-30 | 1988-11-29 | 1989-05-31 | $7700.00 | Window Closed / Lapsed |