Patent US4137756A successfully refreshed from Google Patents.
Patent US5057196A successfully refreshed from Google Patents.
US5057196A
Expired / Lapsed
US
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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 03:46
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.
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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) | 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 |