US4218007A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of diffusion bonding duplex sheet cladding to superalloy substrates
Assignee: General Electric Co
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Filing: 1979-02-22
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Granted: 1980-08-19
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Expires: 1999-02-22
Abstract
Abstract A method of applying a duplex sheet cladding to a structural substrate is disclosed. The method utilizes hot isostatic pressure with molten glass as a pressure transmitting medium. An inner sheet cladding of aluminum is formed over the substrate and then an outer MCrAlY sheet cladding is assembled thereon which completely envelops and seals the inner cladding. Thereafter the duplex cladding is diffusion bonded to the substrate at elevated pressures and temperatures in accordance with a programmed time-temperature hot isostatic pressure cycle.
Inventors
- 👤 William F. Schilling
- 👤 Adrian M. Beltran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:42
CPC Classifications
B; B23; B23K; B23K20/00; B23K20/02; B23K20/021; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49316; Y10T29/49336; Y10T29/49337
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
181 words
A method of applying a duplex sheet cladding to a structural substrate, said method comprising the steps of: (a) assembling an inner aluminum sheet cladding to the substrate so that the cladding closely conforms to the substrate; (b) assembling an outer MCrAlY sheet cladding to the substrate having the inner aluminum sheet cladding assembled thereon whereby the outer corrosion resistant sheet cladding completely envelops and seals the inner sheet cladding; (c) placing the cladding substrate assembly into a deformable container; (d) filling the container with a glass pressure transmitting medium so as to completely immerse the cladding-substrate assembly therein; (e) sealing the container so that it is air-tight; (f) diffusion bonding the cladding to the substrate by a hot isostatic pressing cycle wherein the temperature is initially maintained below the melting point of aluminum, the pressure is increased to establish intimate contact of the inner sheet cladding with the substrate and the outer sheet cladding, and thereafter the temperature is increased up to a maximum of 1200° C., while maintaining the pressurized state until the aluminum has fully reacted and solidified.
Claim 2
Independent Claim
181 words
A method of applying a duplex sheet cladding to a structural substrate, said method comprising the steps of: (a) assembling an inner aluminum sheet cladding to the substrate so that the cladding closely conforms to the substrate; (b) assembling an outer MCrAlY sheet cladding to the substrate having the inner aluminum sheet cladding assembled thereon whereby the outer corrosion resistant sheet cladding completely envelops and seals the inner sheet cladding; (c) placing the cladding substrate assembly into a deformable container; (d) filling the container with a glass pressure transmitting medium so as to completely immerse the cladding-substrate assembly therein; (e) sealing the container so that it is air-tight; (f) diffusion bonding the cladding to the substrate by a hot isostatic pressing cycle wherein the temperature is initially maintained below the melting point of aluminum, the pressure is increased to establish intimate contact of the inner sheet cladding with the substrate and the outer sheet cladding, and thereafter the temperature is increased up to a maximum of 1200° C., while maintaining the pressurized state until the aluminum has fully reacted and solidified.
Claim 3
Dependent Claim
12 words
The method according to claim 1, wherein the substrate is a superalloy.
Claim 4
Dependent Claim
11 words
The method according to claim 2, wherein the superalloy is nickel-base.
Claim 5
Dependent Claim
13 words
The method according to claim 2, wherein the substrate has a concave-convex configuration.
Claim 6
Dependent Claim
13 words
The method according to claim 4, wherein the substrate is a turbine bucket.
Claim 7
Dependent Claim
26 words
The method according to claim 1, wherein the inner cladding has a thickness of 0.5-3 mils and the outer cladding has a thickness of 5-30 mils.
Claim 8
Dependent Claim
43 words
The method according to claim 6, wherein the outer sheet cladding has a composition consisting essentially in weight percent of 15-50% chromium, 0-6% aluminum, 0-3% yttrium, 0-5% tantalum and the balance a member selected from the group consisting of iron, cobalt and nickel.
Claim 9
Dependent Claim
11 words
The method according to claim 7, wherein said composition is Fe-25Cr-4Al-1Y.
Claim 10
Dependent Claim
11 words
The method according to claim 8, wherein said composition is Ni-50Cr.
Claim 11
Dependent Claim
28 words
The method according to claim 1, wherein said hot isostatic pressing cycle is in accordance with the conditions of temperature, pressure and time set forth in FIG. 1.
References Cited (Backward Citations)
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US3873347A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-08-19 | 1984-02-18 | 1984-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-08-19 | 1988-02-18 | 1988-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-08-19 | 1992-02-18 | 1992-08-19 | $7700.00 | Window Closed / Lapsed |