US4741975A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Erosion-resistant coating system
Assignee: Honeywell International Inc
•
Filing: 1986-05-20
•
Granted: 1988-05-03
•
Expires: 2006-05-20
Abstract
Abstract Erosion resistance is imparted to a metallic substrate without an attendant loss of fatigue life in the substrate by applying to the substrate a first layer comprising palladium, platinum or nickel in direct contact with the substrate and then applying a second layer which overcoats the first layer, the second layer being comprised of a tungsten-carbon alloy or a material formed of a tungsten matrix having dispersed tungsten-carbon compound phases therein. In another embodiment erosion resistance is imparted by employing a coating which comprises a first ductile layer on the substrate of palladium, platinum or nickel; a second layer comprising substantially pure tungsten; and a third layer comprising a material formed of a tungsten-carbon alloy or a material formed of a tungsten matrix having dispersed tungsten-carbon compound phases.
Inventors
- 👤 Subhash K. Naik
- 👤 Louis J. Fiedler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:29
CPC Classifications
C; C23; C23C; C23C28/00; C23C28/02; C23C28/023; C23C28/027; C23C28/028; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12493; Y10T428/12535; Y10T428/12576; Y10T428/12583; Y10T428/12771; Y10T428/12806; Y10T428/12826; Y10T428/1284; Y10T428/12847; Y10T428/12854
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
111 words
A layered erosion-resistant coating to be applied to a metallic substrate without substantially any resulting loss in fatigue properties of the substrate which comprises a first ductile layer on the substrate comprising palladium or platinum; a second layer comprising substantially pure tungsten; and a third erosion-resistant layer on the second layer comprising a material formed of a tungsten-carbon alloy or a material formed of a tungsten matrix having a mixture of tungsten-carbon phases dispersed therein, the second and third layers applied at substantially low temperatures, the first layer capable of retaining substrate integrity, not substantiallly diffusing into the substrate, and preventing diffusion of material from the third layer into the substrate.
Claim 2
Dependent Claim
111 words
A layered erosion-resistant coating to be applied to a metallic substrate without substantially any resulting loss in fatigue properties of the substrate which comprises a first ductile layer on the substrate comprising palladium or platinum; a second layer comprising substantially pure tungsten; and a third erosion-resistant layer on the second layer comprising a material formed of a tungsten-carbon alloy or a material formed of a tungsten matrix having a mixture of tungsten-carbon phases dispersed therein, the second and third layers applied at substantially low temperatures, the first layer capable of retaining substrate integrity, not substantiallly diffusing into the substrate, and preventing diffusion of material from the third layer into the substrate.
Claim 3
Dependent Claim
23 words
The coating of claim 1 wherein said third layer is deposited on said second layer at a temperature not exceeding about 700° C.
Claim 4
Dependent Claim
24 words
The coating of claim 1 wherein said second and third layers are deposited at temperatures of from about 200° C. to about 700° C.
Claim 5
Dependent Claim
24 words
The coating of claim 1 wherein said second and third layers are deposited at temperatures of from about 200° C. to about 550° C.
Claim 6
Dependent Claim
49 words
The coating of claim 1 wherein the thickness of said first layer ranges from about 0.1 to about 1.5 mils; the thickness of said second layer ranges from about 0.1 to about 1.5 mils; and the thickness of said third layer ranges from about 0.2 to about 3.0 mils.
Claim 7
Dependent Claim
18 words
The coating of claim 5 wherein the total coating thickness ranges from about 0.5 to about 4 mils.
Claim 8
Dependent Claim
49 words
The coating of claim 1 wherein the thickness of said first layer ranges from about 0.2 to about 0.8 mils; the thickness of said second layer ranges from about 0.2 to about 1.2 mils; and the thickness of the third layer ranges from about 0.3 to about 2.0 mils.
Claim 9
Dependent Claim
18 words
The coating of claim 7 wherein the total coating thickness ranges from about 0.75 to about 2.5 mils.
Claim 10
Dependent Claim
50 words
The coating of claim 1 wherein the thickness of said first layer ranges from about 0.2 to about 0.3 mils; the thickness of said second layer ranges from about 0.5 to about 0.8 mils; and the thickness of said third layer ranges from about 0.5 mils to about 1.0 mils.
Claim 11
Dependent Claim
18 words
The coating of claim 9 wherein the total coating thickness ranges from about 1.0 to about 2.0 mils.
Claim 12
Dependent Claim
33 words
The coating of claim 1 wherein the concentration of said carbon is greatest toward the top surface of said third layer and decreases toward the bonding surface between said second and third layers.
Claim 13
Dependent Claim
19 words
An article of manufacture comprising a metallic substrate overcoated with the coating of claims 1, 4, 8 or 10.
Claim 14
Dependent Claim
15 words
The article of claim 12 wherein said substrate is a stainless steel or titanium alloy.
Claim 15
Dependent Claim
12 words
The coating of claim 1 wherein the first ductile layer comprises palladium.
Claim 16
Dependent Claim
12 words
The coating of claim 14 wherein the substrate comprises a steel alloy.
Claim 17
Dependent Claim
12 words
The coating of claim 1 wherein the first ductile layer comprises platinum.
Claim 18
Dependent Claim
12 words
The coating of claim 16 wherein the substrate comprises a titanium alloy.
Claim 19
Dependent Claim
84 words
A layered erosion-resistant coating to be applied to a titanium substrate without substantially any resulting loss in fatigue properties of the substrate which comprises a first ductile layer on the substrate comprising platinum and a second erosion-resistant layer applied on the first layer at a substantially low temperature comprising a tungsten-carbon alloy or a material formed of a tungsten matrix having dispersed tungsten-carbon phases, the first layer capable of retaining substrate integrity and preventing diffusion of material from the second layer into the substrate.
Claim 20
Dependent Claim
84 words
A layered erosion-resistant coating to be applied to a titanium substrate without substantially any resulting loss in fatigue properties of the substrate which comprises a first ductile layer on the substrate comprising platinum and a second erosion-resistant layer applied on the first layer at a substantially low temperature comprising a tungsten-carbon alloy or a material formed of a tungsten matrix having dispersed tungsten-carbon phases, the first layer capable of retaining substrate integrity and preventing diffusion of material from the second layer into the substrate.
Claim 21
Dependent Claim
26 words
The coating of claim 18 wherein said second layer is deposited upon said first layer at a temperature of from about 200° C. to about 700°.
Claim 22
Dependent Claim
35 words
The coating of claim 18 wherein the thickness of said first layer is from about 0.1 to about 2 mils, and the thickness of said second layer is from about 0.5 to about 4 mils.
Claim 23
Dependent Claim
14 words
An article of manufacture comprising a substrate overcoated with the coating of claim 18.
References Cited (Backward Citations)
US2714563A
Cited
US2822302A
Cited
US3309292A
Cited
US3574572A
Cited
US3552939A
Cited
US3772058A
Cited
US3890456A
Cited
US4055451A
Cited
US3951612A
Cited
US4019873A
Cited
US4147820A
Cited
US4137370A
Cited
US4399199A
Cited
US4268582A
Cited
US4341965A
Cited
US4357382A
Cited
US4427445A
Cited
US4486285A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-05-03 | 1991-11-02 | 1992-05-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-05-03 | 1995-11-02 | 1996-05-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-05-03 | 1999-11-02 | 2000-05-03 | $7700.00 | Window Closed / Lapsed |