US4481179A
Expired / Lapsed
US
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Method for forming fibrous silicon carbide insulating material
Assignee: United States Department of Energy
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Filing: 1983-10-12
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Granted: 1984-11-06
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Expires: 2003-10-12
Abstract
Abstract A method whereby silicon carbide-bonded SiC fiber composites are prepared from carbon-bonded C fiber composites is disclosed. Carbon-bonded C fiber composite material is treated with gaseous silicon monoxide generated from the reaction of a mixture of colloidal silica and carbon black at an elevated temperature in an argon atmosphere. The carbon in the carbon bond and fiber is thus chemically converted to SiC resulting in a silicon carbide-bonded SiC fiber composite that can be used for fabricating dense, high-strength high-toughness SiC composites or as thermal insulating materials in oxidizing environments.
Inventors
- 👤 George C. Wei
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:38
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/573; C04B30/00; C04B30/02; C04B35/622; C04B35/62227; C04B35/71; C04B35/78; C04B35/80
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
50 words
A method of forming a thermal insulating material consisting essentially of SiC fibers, consisting essentially of: forming a precursor material wherein carbon fibers are bonded together by a carbon binder; and contacting gaseous SiO with said precursor material to thereby convert the carbon fibers and carbon binder therein to SiC.
Claim 2
Independent Claim
50 words
A method of forming a thermal insulating material consisting essentially of SiC fibers, consisting essentially of: forming a precursor material wherein carbon fibers are bonded together by a carbon binder; and contacting gaseous SiO with said precursor material to thereby convert the carbon fibers and carbon binder therein to SiC.
Claim 3
Dependent Claim
40 words
The method of claim 1 wherein said precursor material is contacted with a mixture of silica and carbon; and said precursor material and said mixture of silica and carbon are heated to thereby convert said silica and carbon to SiO.
Claim 4
Dependent Claim
26 words
The method of claim 2 wherein said mixture of silica and carbon is placed around said precursor material while being heated to convert it to SiO.
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) | 1987-11-06 | 1988-05-07 | 1988-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-06 | 1992-05-07 | 1992-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-06 | 1996-05-07 | 1996-11-06 | $7700.00 | Window Closed / Lapsed |