US3979534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protective coatings for dispersion strengthened nickel-chromium/alloys
Assignee: General Electric Co
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Filing: 1974-07-26
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Granted: 1976-09-07
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Expires: 1994-07-26
Abstract
Abstract A method of forming a high temperature oxidation resistant coating on a thoria dispersion strengthened nickel-chromium alloy body is provided. The method includes applying to the surface of the body a first coating of metallic cobalt, diffusing the cobalt into the body, and thereafter subjecting the body to a second coating of aluminum.
Inventors
- 👤 John R. Rairden, III
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:01
CPC Classifications
C; C23; C23C; C23C14/00; C23C14/58; C23C14/5806; C23C10/00; C23C10/02; C23C10/28; C23C10/34; C23C10/58; C23C14/06; C23C14/14; C23C14/16; C23C14/5893; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10S428/9335; Y10S428/938; Y10S428/941; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/1266; Y10T428/12667; Y10T428/12736; Y10T428/1275
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
100 words
A method of improving the high temperature oxidation resistance of a thoria dispersion strengthened nickel-chromium alloy body comprising, in sequence the steps of: a. physical vapor deposition of a first coating consisting essentially of cobalt to a surface of said body, b. heat treating the coated body to a temperature sufficient to diffuse at least a portion of the first coating into the surface of said body, and c. subjecting the coated body to a pack cementation vapor deposition to form a second coating comprising aluminum on said body, said second coating being substantially nonporous and adherent to said body.
Claim 2
Independent Claim
100 words
A method of improving the high temperature oxidation resistance of a thoria dispersion strengthened nickel-chromium alloy body comprising, in sequence the steps of: a. physical vapor deposition of a first coating consisting essentially of cobalt to a surface of said body, b. heat treating the coated body to a temperature sufficient to diffuse at least a portion of the first coating into the surface of said body, and c. subjecting the coated body to a pack cementation vapor deposition to form a second coating comprising aluminum on said body, said second coating being substantially nonporous and adherent to said body.
Claim 3
Dependent Claim
52 words
The method of claim 1, wherein said alloy consists essentially of about 20% by weight of chromium, the balance nickel, and 2-3% by volume thoria dispersed therein, said first coating is deposited to a thickness of about 0.1-0.3 mils, and said second coating is deposited to a thickness of about 1.0-3.0 mils.
Claim 4
Dependent Claim
34 words
The method of claim 2, wherein said alloy consists essentially of about 16% by weight of chromium, 4% by weight of aluminum, the balance nickel and about 2% by volume of thoria dispersed therein.
Claim 5
Dependent Claim
39 words
The method of claim 2, wherein said alloy consists essentially of about 20% by weight of chromium, 1.5% by weight of aluminum, 2.5% by weight of titanium, the balance nickel, and about 2.5% by volume of yttria dispersed therein.
Claim 6
Dependent Claim
66 words
The method of claim 4, wherein said body is coated with cobalt to a thickness of about 0.2 mil, said first coated body is heat treated at a temperature of about 1160°C. for about 1.5 hours in an argon atmosphere to diffuse the cobalt into the surface of the alloy, and thereafter the body is aluminized at a temperature of about 1160°C. for about 3 hours.
References Cited (Backward Citations)
US3594219A
Cited
US3764371A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-09-07 | 1980-03-08 | 1980-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-09-07 | 1984-03-08 | 1984-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-09-07 | 1988-03-08 | 1988-09-07 | $7700.00 | Window Closed / Lapsed |