Patent US4382976A successfully refreshed from Google Patents.
US4382976A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming corrosion resistant coatings on metal articles
Assignee: UK Secretary of State for Defence
•
Filing: 1982-01-21
•
Granted: 1983-05-10
•
Expires: 2002-01-21
Abstract
Abstract A metallic or ceramic layer is deposited on a component by plasma spraying. This produces a rough, still porous, coating which is poorly bonded at the interface with the substrate. Aluminium or chromium is vapor deposited under pulsating pressure to react with the substrate to form an oxidation resistant coating of Ni Al (intermetallic) or Ni Cr (solid solution) which may include ceramic particles and is aerodynamically smooth.
Inventors
- 👤 James E. Restall
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:47
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/60; C23C8/62; C23C8/68; C23C10/00; C23C10/02; C23C10/28; C23C10/34; C23C10/36; C23C10/38; C23C10/44; C23C10/48
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
122 words
A method of forming a corrosion resistant coating on an article composed of a nickel-base alloy, the method comprising the steps of: (a) coating the article with an overlay comprising M Cr Al Y where M includes Co, Fe, Ni or NiCo by a physical vapor deposition method; (b) enclosing the article coated according to step (a) in a chamber together with a particulate pack including coating material and a halide activator; and (c) cyclically varying the pressure of an inert gas, a reducing gas, or a mixture of said gases within the chamber while maintaining the contents of the chamber at a temperature sufficient to transfer coating material on to the surface of the overlay to form a diffusion coating therewith.
Claim 2
Independent Claim
122 words
A method of forming a corrosion resistant coating on an article composed of a nickel-base alloy, the method comprising the steps of: (a) coating the article with an overlay comprising M Cr Al Y where M includes Co, Fe, Ni or NiCo by a physical vapor deposition method; (b) enclosing the article coated according to step (a) in a chamber together with a particulate pack including coating material and a halide activator; and (c) cyclically varying the pressure of an inert gas, a reducing gas, or a mixture of said gases within the chamber while maintaining the contents of the chamber at a temperature sufficient to transfer coating material on to the surface of the overlay to form a diffusion coating therewith.
Claim 3
Dependent Claim
17 words
A method according to claim 1 in which the overlay coating in weight percent comprises Co-25Cr-12.5Al-0.35 Y.
Claim 4
Dependent Claim
13 words
A method according to claim 1 in which the overlay coating comprises Ni-37Cr-3Ti-2Al.
Claim 5
Dependent Claim
20 words
A method of claim 1, claim 2 or claim 3 in which the coating material is chromium, boron or silicon.
Claim 6
Dependent Claim
17 words
A method according to claim 1 in which the overlay is deposited by plasma-arc or flame spraying.
Claim 7
Dependent Claim
29 words
A method according to claim 1, claim 2 or claim 3 in which the pack comprises a powder mixture of aluminum, AlF 3 and Al 2 O 3 .
References Cited (Backward Citations)
US3594219A
Cited
US3873347A
Cited
US3977660A
Cited
US3978251A
Cited
US4156042A
Cited
GB1549845A
Cited
US4117179A
Cited
US4101713A
Cited
DE2829369A1
Cited
US4163071A
Cited
US4152223A
Cited
US4145481A
Cited
FR2399487A1
Cited
GB2003935B
Cited
FR2407272B1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-09 | 1986-11-08 | 1987-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-09 | 1990-11-08 | 1991-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-09 | 1994-11-08 | 1995-05-10 | $7700.00 | Window Closed / Lapsed |