US5093156A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing carbon material
Assignee: JAPAN AS REPRESENTED BY DIRECTOR-GENERAL NATIONAL AEROSPACE LABORATORY
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Filing: 1990-07-26
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Granted: 1992-03-03
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Expires: 2010-07-26
Abstract
Abstract A carbon material having oxidation resistance is prepared by forming a fi coating constituted mainly by carbon on the surface of a carbon/carbon composite by chemical vapor deposition, then forming on said first coating a second coating of a ceramic or both a ceramic and carbon by chemical vapor deposition, and changing at least one of thermal physical properties or mechanical physical properties of carbon in said first coating continuously or step-wise.
Inventors
- 👤 Seiichi Uemura
- 👤 Yoshio Sohda
- 👤 Yasuji Ido
- 👤 Yukinori Kude
- 👤 Takefumi Kohno
- 👤 Toshio Hirai
- 👤 Makoto Sasaki
- 👤 Masayuki Niino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:39
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B41/45; C04B41/52; C04B41/80; C04B41/81; C04B41/89; C23; C23C; C23C16/00; C23C16/22; C23C16/26; C23C30/00; C04B2111/00; C04B2111/00241; C04B2111/00405
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
110 words
A process for preparing a carbon material, comprising forming a first coating constituted mainly of carbon on the surface of a carbon/carbn compoiste, said composite having a carbon fiber content of 10 to 70 vol. %, by chemical vapor deposition, then forming on said first coating a second coating of a ceramic or a ceramic and carbon by chemical vapor deposition, and changing at least one of the following properties: thermal coefficient of expansion and Young's modulus in said first coating continuously or step-wise, said change effected by varying at least one of the following chemical vapor deposition conditions: temperature, pressure, thermal decomposing gas feed rate and feedstock dilution ration.
Claim 2
Dependent Claim
110 words
A process for preparing a carbon material, comprising forming a first coating constituted mainly of carbon on the surface of a carbon/carbn compoiste, said composite having a carbon fiber content of 10 to 70 vol. %, by chemical vapor deposition, then forming on said first coating a second coating of a ceramic or a ceramic and carbon by chemical vapor deposition, and changing at least one of the following properties: thermal coefficient of expansion and Young's modulus in said first coating continuously or step-wise, said change effected by varying at least one of the following chemical vapor deposition conditions: temperature, pressure, thermal decomposing gas feed rate and feedstock dilution ration.
Claim 3
Dependent Claim
30 words
A process as set forth in claim 1, wherein said carbon/carbon composite is obtained by impregnating a pitch-based carbon fiber fabric with a carbonaceous pitch and then carbonizing said pitch.
Claim 4
Dependent Claim
36 words
A process as set forth in claim 1, wherein the thermal expansion coefficient of carbon in said first coating becomes larger continuously or step-wise from the carbon/carbon interface to the outermost layer of the first coating.
Claim 5
Dependent Claim
33 words
A process as set forth in claim 1, wherein said first coating is formed by a chemical vapor deposition using a hydrocarbon having 1 to 6 carbon atoms as a thermal decomposing gas.
Claim 6
Dependent Claim
63 words
A process as set forth in claim 1, wherein at the beginning of deposition of said first coating a highly anisotropic carbon is allowed to be formed, and as the carbon deposition proceeds, the anisotropy of the deposited carbon is reduced continuously or step-wise so that at the end of the carbon deposition or thereabouts the carbon is less anisotropic or is sotropic.
Claim 7
Dependent Claim
71 words
A process as set forth in claim 1, wherein said second coating is formed by a chemical vapor deposition using a mixed thermal decomposing gas comprising a hydrocarbon having 1 to 6 carbon atoms and a compound capable of forming by thermal decomposition a ceramic material selected from the group consisting of SiC, ZrC, TiC, HfC, B 4 C, NbC, WC, TiB 2 , BN and Si 3 N 4 .
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) | 1995-03-03 | 1995-09-02 | 1996-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-03 | 1999-09-02 | 2000-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-03 | 2003-09-02 | 2004-03-03 | $7700.00 | Window Closed / Lapsed |