Patent US4895625A successfully refreshed from Google Patents.
US4895625A
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US
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Method for producing a galvanically deposited protection layer against hot gas corrosion
Assignee: MTU Aero Engines AG
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Filing: 1989-05-09
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Granted: 1990-01-23
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Expires: 2009-05-09
Abstract
Abstract Galvanically or electrolytically deposited protective coatings are produced on structural components such as gas turbine blades by suspending in the electrolytic solution a metal alloy powder of which the particles have a spherical configuration and a passivated surface. The concentration of the particles in the electrolyte is preferably smaller than 100 g/l, whereby a high insertion rate of up to 45% by volume has been achieved at relatively low costs and small technical efforts.
Inventors
- 👤 Martin Thoma
- 👤 Monika Bindl
- 👤 Paul Buenger
- 👤 Josef Linska
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:42
CPC Classifications
C; C25; C25D; C25D5/00; C25D5/48; C25D5/50; C25D15/00; C25D15/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
140 words
A method for producing a protective coating on structural components intended for exposure to hot gas, comprising the following steps: (a) preparing an electrolyte in which a matrix material of cobalt and/or nickel is contained, (b) preparing a metal alloy powder of aluminum and/or chromium having powder particles of spherical configuration, (c) passivating the surface of said spherical powder particles, (d) suspending said spherical powder particles in said electrolyte until a particle suspension concentration is reached within the range of 40 g/l to 100 g/l in the electrolyte, (e) immersing said structural component in an electrolytic bath prepared with said electrolyte, and performing a galvanic deposition until a coating having the desired thickness is obtained, and (f) removing the coated component from said electrolytic bath and subjecting the coated component to a heat treatment until an alloyed coating is formed.
Claim 2
Independent Claim
140 words
A method for producing a protective coating on structural components intended for exposure to hot gas, comprising the following steps: (a) preparing an electrolyte in which a matrix material of cobalt and/or nickel is contained, (b) preparing a metal alloy powder of aluminum and/or chromium having powder particles of spherical configuration, (c) passivating the surface of said spherical powder particles, (d) suspending said spherical powder particles in said electrolyte until a particle suspension concentration is reached within the range of 40 g/l to 100 g/l in the electrolyte, (e) immersing said structural component in an electrolytic bath prepared with said electrolyte, and performing a galvanic deposition until a coating having the desired thickness is obtained, and (f) removing the coated component from said electrolytic bath and subjecting the coated component to a heat treatment until an alloyed coating is formed.
Claim 3
Dependent Claim
22 words
The method of claim 1, wherein said particle suspension concentration is within the range of 40 to 60 g/l of the electrolyte.
Claim 4
Dependent Claim
16 words
The method of claim 1, wherein said spherical metal alloy powder particles are a CrAlY powder.
Claim 5
Dependent Claim
29 words
The method of claim 1, wherein said spherical metal alloy powder particles are selected from the group consisting of CrAlHf, CrAlYHf, CrAlTa, CrAlYta, CrNiAl, CrCoAl, CrAlSi, CrAl, and MoCrSi.
Claim 6
Dependent Claim
35 words
The method of claim 1, wherein said step of preparing said metal alloy powder is performed by spraying a respective hot alloy through a nozzle, thereby achieving a so-called atomizing resulting in spherical powder particles.
Claim 7
Dependent Claim
30 words
The method of claim 1, wherein said step of suspending said spherical powder particles in said electrolyte is performed by blowing the particles in an air flow into the electrolyte.
Claim 8
Dependent Claim
36 words
The method of claim 1, wherein said step of suspending said spherical powder particles in said electrolyte is performed by pumping said electrolyte in a circulating circuit at least while adding said particles to said electrolyte.
Claim 9
Dependent Claim
32 words
The method of claim 1, wherein said step of suspending said spherical powder particles in said electrolyte is perform by stirring said electrolyte at least while adding said particles to said electrolyte.
Claim 10
Dependent Claim
27 words
The method of claim 1, wherein said step of heat treatment is performed at a temperature within the range of about 900° C. to about 1100° C.
Claim 11
Dependent Claim
24 words
The method of claim 9, wherein said that heat treatment is applied for a time duration of about 5 hours to about 50 hours.
Claim 12
Dependent Claim
25 words
The method of claim 1, wherein said spherical powder particles have a particle size within the range of about 1 μm to about 15 μm.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-22 | 1993-07-24 | 1994-01-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-22 | 1997-07-24 | 1998-01-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-22 | 2001-07-24 | 2002-01-23 | $7700.00 | Window Closed / Lapsed |