US4405685A
Expired / Lapsed
US
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Carbon fibers with duplex metal carbide coating and methods for manufacture thereof
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1981-11-10
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Granted: 1983-09-20
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Expires: 2001-11-10
Abstract
Abstract A carbon fiber coated with a duplex film consisting of an inner-layer film formed of a mixture of free carbon and metal carbide and an outer-layer film formed substantially of metal carbide.
Inventors
- 👤 Kuniaki Honjo
- 👤 Akio Shindo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:08
CPC Classifications
D; D01; D01F; D01F11/00; D01F11/10; D01F11/12; D01F11/126; C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/4584; C04B41/52; D01F11/125; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2918; Y10T428/292
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
80 words
A uniaxially aligned carbon fiber coated with a duplex film consisting of an inner-layer film containing free carbon and metal carbide at a weight ratio in the range from 95:5 to 5:95 and an outer-layer film substantially solely of metal carbide, the total thickness of the inner-layer film and the outer-layer film being in the range of 0.01 to 3 μm, the thickness ratio of said inner-layer film to said outer-layer film falling in the range of 5:1 to 1:5.
Claim 2
Dependent Claim
80 words
A uniaxially aligned carbon fiber coated with a duplex film consisting of an inner-layer film containing free carbon and metal carbide at a weight ratio in the range from 95:5 to 5:95 and an outer-layer film substantially solely of metal carbide, the total thickness of the inner-layer film and the outer-layer film being in the range of 0.01 to 3 μm, the thickness ratio of said inner-layer film to said outer-layer film falling in the range of 5:1 to 1:5.
Claim 3
Dependent Claim
29 words
The carbon fiber according to claim 1 wherein the carbon fiber to be coated with the duplex film has a tensile strength of at least 180 Kg/mm 2 .
Claim 4
Dependent Claim
33 words
The carbon fiber according to claim 1 wherein the metal carbide is a carbide of at least one member selected from the group consisting of silicon, boron, titanium, zirconium, niobium, tungsten, and tantalum.
Claim 5
Independent Claim
142 words
A method for the manufacture of a uniaxially aligned carbon fiber coated with a duplex film which method comprises the steps of heating the carbon fiber to be coated to a temperature in the range of 800°-1800° C. in an inert atmosphere, feeding a mixed gas containing a compound containing a carbide-forming metal, a carbon containing compound, and hydrogen gas into contact with the heated carbon fiber thereby depositing on the carbon fiber (a) an inner-layer film of a mixture of free carbon and a metal carbide, and then feeding a mixed gas containing a carbon compound, a metal compound, and hydrogen into contact with the coated carbon fiber thereby depositing on said inner-layer film an outer-layer film of a metal carbide, the total thickness of said inner-layer film and said outer-layer film being in the range of 0.01 to 3 μm.
Claim 6
Independent Claim
142 words
A method for the manufacture of a uniaxially aligned carbon fiber coated with a duplex film which method comprises the steps of heating the carbon fiber to be coated to a temperature in the range of 800°-1800° C. in an inert atmosphere, feeding a mixed gas containing a compound containing a carbide-forming metal, a carbon containing compound, and hydrogen gas into contact with the heated carbon fiber thereby depositing on the carbon fiber (a) an inner-layer film of a mixture of free carbon and a metal carbide, and then feeding a mixed gas containing a carbon compound, a metal compound, and hydrogen into contact with the coated carbon fiber thereby depositing on said inner-layer film an outer-layer film of a metal carbide, the total thickness of said inner-layer film and said outer-layer film being in the range of 0.01 to 3 μm.
Claim 7
Dependent Claim
54 words
The method according to claim 4 wherein the carbide-forming metal compound is one member selected from the group consisting of SiCl 4 , CH 3 SiCl 3 , (CH 3 ) 2 SiCl 2 , TiCl 4 , BCl 3 , ZrCl 4 , WCl 6 , NbCl 5 , and TaCl 5 .
Claim 8
Dependent Claim
20 words
The method according to claim 4 wherein the carbon containing compound is a low-molecular hydrocarbon or a halogen-containing carbon compound.
Claim 9
Dependent Claim
24 words
The method according to claim 4 wherein the free carbon content in the mixed film is adjusted by regulating the amount of hydrogen added.
Claim 10
Independent Claim
135 words
A method of the manufacture of a uniaxially aligned carbon fiber coated with a duplex film, which method comprises the steps of heating the carbon fiber to be coated to a temperature in the range of 1000°-1500° C. in an inert atmosphere, feeding a mixed gas containing a compound containing a carbide-forming metal and hydrogen into contact with the heated carbon fiber thereby forming on the carbon fiber (a) an inner-layer film of a mixture of free carbon with a metal carbide, and then feeding a mixed gas containing an organic metal compound and hydrogen into contact with the coated carbon fiber thereby depositing on said inner-layer film an outer-layer film of a metal carbide, the total thickness of said inner-layer film and said outer-layer film being in the range of 0.01 to 3 μm.
Claim 11
Independent Claim
135 words
A method of the manufacture of a uniaxially aligned carbon fiber coated with a duplex film, which method comprises the steps of heating the carbon fiber to be coated to a temperature in the range of 1000°-1500° C. in an inert atmosphere, feeding a mixed gas containing a compound containing a carbide-forming metal and hydrogen into contact with the heated carbon fiber thereby forming on the carbon fiber (a) an inner-layer film of a mixture of free carbon with a metal carbide, and then feeding a mixed gas containing an organic metal compound and hydrogen into contact with the coated carbon fiber thereby depositing on said inner-layer film an outer-layer film of a metal carbide, the total thickness of said inner-layer film and said outer-layer film being in the range of 0.01 to 3 μm.
Claim 12
Dependent Claim
54 words
The method according to claim 8 wherein the carbide-forming metal compound is one member selected from the group consisting of SiCl 4 , CH 3 SiCl 3 , (CH 3 ) 2 SiCl 2 , TiCl 4 , BCl 3 , ZrCl 4 , WCl 6 , NbCl 5 , and TaCl 5 .
Claim 13
Dependent Claim
24 words
The method according to claim 8 wherein the free carbon content in the mixed film is adjusted by regulating the amount of hydrogen added.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1986-09-19 | 1987-03-21 | 1987-09-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-19 | 1991-03-21 | 1991-09-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-19 | 1995-03-21 | 1995-09-20 | $7700.00 | Window Closed / Lapsed |