US5057196A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming platinum-silicon-enriched diffused aluminide coating on a superalloy substrate
Assignee: Rolls Royce Corp
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Filing: 1990-12-17
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Granted: 1991-10-15
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Expires: 2010-12-17
Abstract
Abstract A platinum-silicon powder is electrophoretically deposited on a nickel or cobalt base superalloy substrate. The deposited powder is heated to form a transient liquid phase on the substrate and initiate diffusion of Pt and Si into the substrate. An aluminum-chromium powder is then electrophoretically deposited on the Pt-Si enriched substrate and diffusion heat treated to form a corrosion- and oxidation-resistant Pt-Si enriched diffused aluminide coating on the substrate. The presence of both Pt and Si in the aluminide coating unexpectedly improves coating ductility as compared to a Pt-enriched diffused aluminide coating without Si on the same substrate material.
Inventors
- 👤 George E. Creech
- 👤 Michael J. Barber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:35
CPC Classifications
C; C25; C25D; C25D13/00; C25D13/02; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12736; Y10T428/1275
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
148 words
A method of forming a hot corrosion- and oxidation-resistant diffused aluminide coating of improved ductility on a nickel- or cobalt-base superalloy substrate body, comprising: (a) electrophoretically depositing onto a said substrate a platinum-silicon powder comprising about 3 percent to about 50 percent by weight silicon and the balance essentially platinum, (b) heating the deposited platinum-silicon powder at a temperature sufficient to melt the powder into a transient liquid phase and to initiate diffusion of platinum and silicon into the substrate, (c) electrophoretically depositing an aluminum-bearing powder comprising aluminum, chromium and optionally manganese onto the platinum and silicon-enriched substrate, and (d) heating the deposited aluminum-bearing powder at a temperature and for a time sufficient to form a platinum- and silicon-enriched diffused aluminide coating on the substrate having a coating ductility at elevated temperatures greater than that of a platinum-enriched aluminide coating without silicon formed on the same substrate material.
Claim 2
Independent Claim
148 words
A method of forming a hot corrosion- and oxidation-resistant diffused aluminide coating of improved ductility on a nickel- or cobalt-base superalloy substrate body, comprising: (a) electrophoretically depositing onto a said substrate a platinum-silicon powder comprising about 3 percent to about 50 percent by weight silicon and the balance essentially platinum, (b) heating the deposited platinum-silicon powder at a temperature sufficient to melt the powder into a transient liquid phase and to initiate diffusion of platinum and silicon into the substrate, (c) electrophoretically depositing an aluminum-bearing powder comprising aluminum, chromium and optionally manganese onto the platinum and silicon-enriched substrate, and (d) heating the deposited aluminum-bearing powder at a temperature and for a time sufficient to form a platinum- and silicon-enriched diffused aluminide coating on the substrate having a coating ductility at elevated temperatures greater than that of a platinum-enriched aluminide coating without silicon formed on the same substrate material.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein the platinum-silicon and/or the aluminum powder are prealloyed.
Claim 4
Dependent Claim
23 words
The method of claim 1 wherein the platinum-silicon powder comprises about 5 to 20 percent by weight silicon and the balance essentially platinum.
Claim 5
Dependent Claim
31 words
The method of claim 1 wherein the aluminum content of the aluminum-bearing powder is about 40 percent to about 75 percent by weight with the balance being chromium and optionally manganese.
Claim 6
Dependent Claim
49 words
A hot corrosion- and oxidation-resistant article comprising a nickel or cobalt superalloy substrate having a platinum- and silicon-enriched diffused aluminide coating formed thereon, said coating having a coating ductility at elevated temperatures greater than that of a platinum-enriched diffused aluminide coating without silicon formed on the same substrate material.
Claim 7
Dependent Claim
49 words
A hot corrosion- and oxidation-resistant article comprising a nickel or cobalt superalloy substrate having a platinum- and silicon-enriched diffused aluminide coating formed thereon, said coating having a coating ductility at elevated temperatures greater than that of a platinum-enriched diffused aluminide coating without silicon formed on the same substrate material.
References Cited (Backward Citations)
US3494748A
Cited
US3819338A
Cited
US3692554A
Cited
US3748110A
Cited
US4084025A
Cited
US3955935A
Cited
US4530885A
Cited
US4439470A
Cited
US4656099A
Cited
US4774149A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-10-14 | 1995-04-15 | 1995-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-10-14 | 1999-04-15 | 1999-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-10-14 | 2003-04-15 | 2003-10-15 | $7700.00 | Window Closed / Lapsed |