US3989559A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Superalloys containing nitrides and process for producing same
Assignee: GTE Sylvania Inc
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Filing: 1974-10-10
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Granted: 1976-11-02
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Expires: 1994-10-10
Abstract
Abstract Superalloys containing uniform dispersions of at least 0.1 volume percent of a metal nitride improve qualities of superalloys. These superalloys are produced from superalloy powders by a nitriding process utilizing a controlled atmosphere for controlled times at controlled temperature. A nitriding temperature of at least 700 DEG C is required in order to produce effective amounts of nitride in practical lengths of time.
Inventors
- 👤 Ching San Lin
- 👤 James Thomas Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:34
CPC Classifications
C; C23; C23C; C23C8/00; C23C8/06; C23C8/08; C23C8/24; B; B22; B22F; B22F1/00; B22F1/14; B22F1/145
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
73 words
A process comprising: a. providing an atmosphere containing at least 10% nitrogen and the balance an inert gas, b. placing a superalloy powder containing from about 50% to about 75% by weight of nickel in said atmosphere, c. maintaining said powder in said atmosphere and at a temperature of from about 700° C to about 950° C for at least about 3 hours and d. cooling the resulting powder to below 700° C.
Claim 2
Dependent Claim
73 words
A process comprising: a. providing an atmosphere containing at least 10% nitrogen and the balance an inert gas, b. placing a superalloy powder containing from about 50% to about 75% by weight of nickel in said atmosphere, c. maintaining said powder in said atmosphere and at a temperature of from about 700° C to about 950° C for at least about 3 hours and d. cooling the resulting powder to below 700° C.
Claim 3
Dependent Claim
20 words
A process according to claim 1 wherein said atmosphere contains from about 10 to about 100% by volume of nitrogen.
Claim 4
Dependent Claim
30 words
A process according to claim 2 wherein said temperature is from about 750° C to about 850 ° C and wherein said temperature is maintained for 4 to 8 hours.
References Cited (Backward Citations)
US3067032A
Cited
US3720551A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-11-02 | 1980-05-03 | 1980-11-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-11-02 | 1984-05-03 | 1984-11-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-11-02 | 1988-05-03 | 1988-11-02 | $7700.00 | Window Closed / Lapsed |