US4038041A
Expired / Lapsed
US
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Composite interlayer for diffusion bonding
Assignee: RTX Corp
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Filing: 1975-12-19
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Granted: 1977-07-26
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Expires: 1995-12-19
Abstract
Abstract An interlayer for transient liquid phase diffusion bonding of the nickel, cobalt and iron alloys is provided between surfaces to be joined as a thin lamellar composite.
Inventors
- 👤 David Scott Duvall
- 👤 Daniel Francis Paulonis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:26
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/001; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12222
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
116 words
In an interlayer for bonding metallic articles which are based on a metal chosen from the group consisting of nickel, cobalt, and iron, said interlayer having a composition similar to that of the articles being joined, except for the addition of a quantity of at least one melting point depressant, said interlayer having a brittle characteristic because of the formation of brittle phases, the improvement which comprises: providing the interlayer in the form of a plurality of lamellae, each of said lamellae being free from those combinations of elements which form brittle phases; whereby the lamellar interlayer is ductile even though its overall composition is one which would be brittle if produced in a homogeneous form.
Claim 2
Dependent Claim
116 words
In an interlayer for bonding metallic articles which are based on a metal chosen from the group consisting of nickel, cobalt, and iron, said interlayer having a composition similar to that of the articles being joined, except for the addition of a quantity of at least one melting point depressant, said interlayer having a brittle characteristic because of the formation of brittle phases, the improvement which comprises: providing the interlayer in the form of a plurality of lamellae, each of said lamellae being free from those combinations of elements which form brittle phases; whereby the lamellar interlayer is ductile even though its overall composition is one which would be brittle if produced in a homogeneous form.
Claim 3
Dependent Claim
12 words
An interlayer as in claim 1 wherein the melt depressant is boron.
Claim 4
Dependent Claim
22 words
An interlayer as in claim 1 wherein no single lamella contains amounts of the brittle gamma prime phase sufficient to impair fabricability.
Claim 5
Dependent Claim
36 words
An interlayer as in claim 1 wherein no single lamella contains significant amounts of both carbon and a material chosen from the group consisting of hafnium, chromium, tantalum, columbium, titanium, zirconium and tungsten and mixtures thereof.
Claim 6
Dependent Claim
17 words
An interlayer as in claim 1 wherein the lamellae are bonded together to form a unitary interlayer.
Claim 7
Dependent Claim
31 words
An interlayer as in claim 1 wherein at least one of the lamellae melts at a lower temperature than would a corresponding alloy of the overall composition of the lamellar interlayer.
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) | 1980-07-25 | 1981-01-24 | 1981-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-25 | 1985-01-24 | 1985-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-25 | 1989-01-24 | 1989-07-26 | $7700.00 | Window Closed / Lapsed |