US5208071A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for aluminizing a ferritic workpiece by coating it with an aqueous alumina slurry, adding a halide activator, and heating
Assignee: Babcock and Wilcox Power Generation Group Inc
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Filing: 1992-04-24
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Granted: 1993-05-04
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Expires: 2012-04-24
Abstract
Abstract An improved method for aluminizing a ferritic material by forming an aqueous aluminum slurry composition, applying the aqueous aluminum slurry composition to the ferritic material to form a coating, adding a halide activator to the coated ferritic material and heating the coated ferritic material to a temperature of about 1275° F. to about 1300° F. for approximately 24 hours. The use of the lower temperature thermal cycle minimizes the change in the mechanical properties of a steel substrate.
Inventors
- 👤 Thomas L. Davis
- 👤 Dale F. LaCount
- 👤 Steven E. LeBeau
- 👤 Kenneth D. Seibert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:09
CPC Classifications
C; C23; C23C; C23C10/00; C23C10/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
73 words
A method for aluminizing a ferritic workpiece, comprising the steps of; forming an aqueous aluminum slurry composition, the aqueous aluminum slurry composition comprising methyl cellulose, alumina, aluminum powder and water; applying said aluminum slurry composition to the ferritic workpiece to form a coating; adding a halide activator to the coated ferritic workpiece; and heating the coated ferritic workpiece to a temperature of about 1275° F. to about 1300° F. for approximately 24 hours.
Claim 2
Independent Claim
73 words
A method for aluminizing a ferritic workpiece, comprising the steps of; forming an aqueous aluminum slurry composition, the aqueous aluminum slurry composition comprising methyl cellulose, alumina, aluminum powder and water; applying said aluminum slurry composition to the ferritic workpiece to form a coating; adding a halide activator to the coated ferritic workpiece; and heating the coated ferritic workpiece to a temperature of about 1275° F. to about 1300° F. for approximately 24 hours.
Claim 3
Dependent Claim
26 words
A method for aluminizing a ferritic workpiece, as recited in claim 1, further comprising the step of furnace cooling the coated ferritic workpiece to room temperature.
Claim 4
Dependent Claim
32 words
A method for aluminizing a ferritic workpiece, as recited in claim 1, wherein the halide activator is a member selected from the group consisting of NH 4 Cl and NH 4 Br.
References Cited (Backward Citations)
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US4208453A
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US3775151A
Cited
US4009146A
Cited
US4004047A
Cited
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Cited
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Cited
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Cited
US4687684A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-05-03 | 1996-11-02 | 1997-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-03 | 2000-11-02 | 2001-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-03 | 2004-11-02 | 2005-05-04 | $7700.00 | Window Closed / Lapsed |