US5198285A
Expired / Lapsed
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Hard and lubricant thin film of iron base metallic material coated with amorphous carbon-hydrogen-silicon
Assignee: Toyota Central R&D Labs Inc
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Filing: 1990-12-27
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Granted: 1993-03-30
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Expires: 2010-12-27
Abstract
Abstract A hard and lubricant thin film of amorphous carbon-hydrogen-silicon and a process of producing the same. The thin film comprises carbon and hydrogen as major components, the balance mainly containing a silicon-based material, and it contains diamond-like carbon. The content of hydrogen is from 30 to 50% by atomic and the content of carbon is 70% by atomic or more with respect to the total composition except hydrogen. An iron-based metallic material having the thin film of amorphous carbon-hydrogen-silicon formed thereon and a process for producing the same are also provided. The iron-based matallic material is very hard and has a small coefficient of friction.
Inventors
- 👤 Tohru Arai
- 👤 Kazuyuki Oguri
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:22
CPC Classifications
C; C23; C23C; C23C16/00; C23C16/22; C23C16/26; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/2495; Y10T428/24967; Y10T428/24975; Y10T428/30; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
69 words
A hard and lubricating thin film of amorphous carbon-hydrogen-silicon, which consists essentially of: carbon, hydrogen and silicon, wherein the content of said hydrogen is from 30 to 50 atomic % and the content of said carbon is from 70 to 90 atomic % with respect to the total composition except said hydrogen, and the thin film contains diamond-like carbon, and is from 0.5 μm to 10 μm in thickness.
Claim 2
Dependent Claim
69 words
A hard and lubricating thin film of amorphous carbon-hydrogen-silicon, which consists essentially of: carbon, hydrogen and silicon, wherein the content of said hydrogen is from 30 to 50 atomic % and the content of said carbon is from 70 to 90 atomic % with respect to the total composition except said hydrogen, and the thin film contains diamond-like carbon, and is from 0.5 μm to 10 μm in thickness.
Claim 3
Dependent Claim
39 words
The hard thin film according to claim 1, wherein said diamond-like carbon is a substance yielding a broad band at around 1550 cm -1 and a shoulder band at around 1400 cm -1 when detected by laser Raman spectroscopy.
Claim 4
Dependent Claim
95 words
An iron-based metallic material having on the surface thereof a hard and low-friction layer, which consists essentially of: a substrate of iron or an iron alloy material; a metal-carbon compound layer formed on the surface of the substrate; and a hard thin film of a thickness of from 0.5 μm to 10 μm of amorphous carbon-hydrogen-silicon formed on the metal-carbon compound layer, said thin film consisting essentially of from 30 to 50 atomic % of hydrogen, from 70 to 90 atomic % of carbon, with the balance silicon, and the thin film containing diamond-like carbon.
Claim 5
Dependent Claim
95 words
An iron-based metallic material having on the surface thereof a hard and low-friction layer, which consists essentially of: a substrate of iron or an iron alloy material; a metal-carbon compound layer formed on the surface of the substrate; and a hard thin film of a thickness of from 0.5 μm to 10 μm of amorphous carbon-hydrogen-silicon formed on the metal-carbon compound layer, said thin film consisting essentially of from 30 to 50 atomic % of hydrogen, from 70 to 90 atomic % of carbon, with the balance silicon, and the thin film containing diamond-like carbon.
Claim 6
Dependent Claim
40 words
The iron-based metallic material according to claim 3, wherein said metal-carbon compound contains at least one metal selected from the group consisting of iron (Fe), vanadium (V), titanium (Ti), chromium (Cr), niobium (Nb), tungsten (W), molybdenum (Mo), and tantalum (Ta).
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-03-29 | 1996-09-28 | 1997-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-03-29 | 2000-09-28 | 2001-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-03-29 | 2004-09-28 | 2005-03-30 | $7700.00 | Window Closed / Lapsed |