Patent US5240887A successfully refreshed from Google Patents.
US5240887A
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US
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Heat treatment method for silicon and carbon-containing ceramic fibers and fibers of the same kind with a laminated structure
Assignee: Airbus Group SAS
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Filing: 1989-08-23
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Granted: 1993-08-31
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Expires: 2009-08-23
Abstract
Abstract The invention is related to a heat treatment method for silicon and carbon-containing ceramic fibers as well as fibers of the same nature with a laminated structure and having an external carbon layer. The processing method for the invention comprises a heat treatment in vacuum, during at least three hours and at a temperature of about 1000° C. This treatment yields fibers surrounded with a layer of endogenic SiO 2 , that is itself coated with a layer of endogenic carbon. Said fibers can be used to make composite materials with fiber reinforcement.
Inventors
- 👤 Pierre Lespade
- 👤 Alain Guette
- 👤 Erik Menessier
- 👤 Rene Pailler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:16
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/571; C04B41/45; C04B41/4584; C04B41/52; C04B41/80; C04B41/81; C04B41/89
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
74 words
A method of producing laminated silicon carbide-containing ceramic fibers which consists essentially of subjecting silicon carbide-containing ceramic fibers, previously obtained from polycarbosilane fibers crosslinked with oxygen, to a heat treatment at a temperature of about 1000° C., in a vacuum, for at least three hours to produce laminated silicon carbide-containing ceramic fibers, which are coated with an endogenic SiO 2 intermediate layer, which in turn is coated with an external layer of endogenic carbon.
Claim 2
Independent Claim
74 words
A method of producing laminated silicon carbide-containing ceramic fibers which consists essentially of subjecting silicon carbide-containing ceramic fibers, previously obtained from polycarbosilane fibers crosslinked with oxygen, to a heat treatment at a temperature of about 1000° C., in a vacuum, for at least three hours to produce laminated silicon carbide-containing ceramic fibers, which are coated with an endogenic SiO 2 intermediate layer, which in turn is coated with an external layer of endogenic carbon.
Claim 3
Dependent Claim
19 words
The method of claim 1, wherein the heat treatment is carried out during a period of approximately 60 hours.
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) | 1996-08-30 | 1997-03-01 | 1997-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-30 | 2001-03-01 | 2001-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-30 | 2005-03-01 | 2005-08-31 | $7700.00 | Window Closed / Lapsed |