US4525417A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Carbon-containing sliding layer
Assignee: US Philips Corp
•
Filing: 1983-02-24
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Granted: 1985-06-25
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Expires: 2003-02-24
Abstract
Abstract A workpiece comprises a substrate having a sliding surface provided with a friction-reducing coating. Such coating consists essentially of elemental carbon dispersed in a matrix formed of at least one metallic element in the proportions of 50.1 to 99.1 at % of the elemental carbon and 0.1 to 49.9 at % of the metallic element. The ratio of the metallic element to the elemental carbon differs from the stoichiometric ratio of the carbide.
Inventors
- 👤 Heinz Dimigen
- 👤 Hubertus Hubsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:33
CPC Classifications
C; C23; C23C; C23C30/00; F; F16; F16C; F16C33/00; F16C33/02; F16C33/04; F16C33/16; Y; Y10; Y10T; Y10T428/00; Y10T428/30; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
73 words
A workpiece comprising a substrate having a sliding surface provided with a friction-reducing coating; said coating consisting essentially of elemental carbon dispersed in a matrix formed of at least one metallic element in the proportions of 50.1 to 99.9 at % of the elemental carbon and 0.1 to 49.9 at % of the metallic element, the ratio of the metallic element to the elemental carbon differing from the stoichiometric ratio of a carbide.
Claim 2
Dependent Claim
73 words
A workpiece comprising a substrate having a sliding surface provided with a friction-reducing coating; said coating consisting essentially of elemental carbon dispersed in a matrix formed of at least one metallic element in the proportions of 50.1 to 99.9 at % of the elemental carbon and 0.1 to 49.9 at % of the metallic element, the ratio of the metallic element to the elemental carbon differing from the stoichiometric ratio of a carbide.
Claim 3
Dependent Claim
12 words
A workpiece according to claim 1, in which the substrate is metallic.
Claim 4
Dependent Claim
33 words
A workpiece according to claim 1, in which the coating consists essentially of 60 to 97 at % of elemental carbon and 40 to 3 at % of at least one metallic element.
Claim 5
Dependent Claim
33 words
A workpiece according to claim 3, in which the coating consists essentially of 80 to 95 at % of elemental carbon and 20 to 5 at % of at least one metallic element.
Claim 6
Dependent Claim
29 words
A workpiece according to claim 1, in which the metallic element is an element of group Ib, IIb, IIIa, IV, Vb, VIb, VIIb or VIII of the periodic table.
Claim 7
Dependent Claim
18 words
A workpiece according to claim 5, in which the metallic element is silicon, tantalum, tungsten, ruthenium or iron.
Claim 8
Dependent Claim
33 words
A method of making a workpiece according to claim 1, which includes coating the sliding surface of the substrate by chemical or physical vapour deposition of the elemental carbon and the metallic element.
Claim 9
Dependent Claim
29 words
A method according to claim 7, which includes depositing the elemental carbon and the metallic element by cathode sputtering of a target formed from carbon and the metallic element.
Claim 10
Dependent Claim
38 words
A method according to claim 7, which includes depositing the elemental carbon and the metallic element by cathode sputtering of a target formed from the metallic element in an atmosphere of an inert gas and a hydrocarbon gas.
Claim 11
Dependent Claim
30 words
A method according to claim 9, which includes starting the deposition in an atmosphere containing only the inert gas and then continuing the deposition under an inert gas-hydrocarbon gas atmosphere.
Claim 12
Dependent Claim
13 words
A method according to claim 9, in which the inert gas comprises argon.
Claim 13
Dependent Claim
13 words
A method according to claim 9, in which the hydrocarbon gas comprises acetylene.
References Cited (Backward Citations)
US4293512A
Cited
US4289822A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-24 | 1988-12-24 | 1989-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-24 | 1992-12-24 | 1993-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-24 | 1996-12-24 | 1997-06-25 | $7700.00 | Window Closed / Lapsed |