US4904528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated gas turbine engine compressor components
Assignee: RTX Corp
•
Filing: 1987-12-24
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Granted: 1990-02-27
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Expires: 2007-12-24
Abstract
Abstract Coated gas turbine engine hardware is described. The hardware comprises a titanium alloy substrate having a coating thereon consisting essentially of titanium nitride wherein the ratio of nitrogen to titanium is greater than one. Such coatings have a residual compressive stress state which aids in minimizing the fatigue debit which would otherwise result from the use of a hard coating on a titanium substrate. Coatings are applied by the use of a vacuum arc deposition process.
Inventors
- 👤 Dinesh K. Gupta
- 👤 Melvin Freling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:55
CPC Classifications
F; F02; F02C; F02C7/00; F02C7/30; C; C23; C23C; C23C14/00; C23C14/06; C23C14/0641; C23C14/22; C23C14/24; C23C14/32; C23C14/325; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12576; Y10T428/12583; Y10T428/26; Y10T428/263; Y10T428/264; Y10T428/265; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
50 words
An erosion resistant coated titanium article having fatigue properties essentially equal to a similar uncoated titanium article which comprises: a titanium article having residual compressive surface stresses; a titanium nitride surface coating on said article having residual compressive surface stresses in excess of the preexisting titanium residual compressive surface stress.
Claim 2
Dependent Claim
50 words
An erosion resistant coated titanium article having fatigue properties essentially equal to a similar uncoated titanium article which comprises: a titanium article having residual compressive surface stresses; a titanium nitride surface coating on said article having residual compressive surface stresses in excess of the preexisting titanium residual compressive surface stress.
Claim 3
Dependent Claim
24 words
An article as in claim 1 wherein the titanium article surface stress is 50-100 ksi and the coating residual surface stress is 100-150 ksi.
Claim 4
Dependent Claim
23 words
An article as in claim 1 wherein the coating residual surface stress exceeds the titanium article residual surface stress by about 10-40 ksi.
Claim 5
Dependent Claim
13 words
An article as in claim 1 wherein the coating is 10-25 microns thick.
Claim 6
Dependent Claim
26 words
An article as in claim 1 wherein the ratio of nitrogen to titanium in the titanium nitride surface coating is from about 1.05 to about 1.15.
References Cited (Backward Citations)
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-26 | 1993-08-28 | 1994-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-26 | 1997-08-28 | 1998-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-26 | 2001-08-28 | 2002-02-27 | $7700.00 | Window Closed / Lapsed |