Patent US3853567A successfully refreshed from Google Patents.
US3853567A
Expired / Lapsed
US
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Production of shaped articles of homogeneous mixtures of silicon carbide and nitride
Assignee: Bayer AG
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Filing: 1973-04-02
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Granted: 1974-12-10
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Expires: 1993-04-02
Abstract
Abstract A shaped article such as a fiber comprising a homogeneous mixture of silicon carbide and nitride is produced by pyrolyzing at about 200* to 800*C a silazane to produce a fusible carbosilazane resin, forming the resin into fiber and heating the fiber in an inert atmosphere to about 800 to 2,000*C. The fiber or other shaped article prior to final pyrolysis may be rendered infusible. Various additives may be incorporated into the fusible carbosilazane prior to shaping.
Inventors
- 👤 W Verbeek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:46
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/571; C01; C01B; C01B21/00; C01B21/082; C01B21/0828; C01B32/00; C01B32/90; C04B35/58; C04B35/584; C04B35/589; C01P; C01P2002/00; C01P2002/02; C01P2004/00; C01P2004/10; C01P2004/60; C01P2004/61; C01P2004/80; C01P2006/00; C01P2006/60; C01P2006/90
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
69 words
A PROCESS FOR PRODUCING SHAPED FORMS COMPRISING HOMOGENEOUS MIXTURES OF SILICON CARBIDE AND SILICON NITRIDE, WHICH COMPRISES PYROLYZING AT A TEMPERATURE OF ABOUT 200* TO 800*C A SILAZANE TO PRODUCE A FUSIBLE CARBOSILAZANE RESIN, SHAPING SAID CARBOSILAZE RESIN INTO PREDETERMINED FORM, AND HEATING SAID SHAPED FROM OF CARBOSILAZANE RESIN TO ABOUT 800* TO 2,000*C IN AN INERT ATMOSPHERE, THEREBY TO CONVERT THE CARBOSILAZANE TO SILICON CARBIDE AND SILICON NITRIDE.
Claim 2
Dependent Claim
69 words
A PROCESS FOR PRODUCING SHAPED FORMS COMPRISING HOMOGENEOUS MIXTURES OF SILICON CARBIDE AND SILICON NITRIDE, WHICH COMPRISES PYROLYZING AT A TEMPERATURE OF ABOUT 200* TO 800*C A SILAZANE TO PRODUCE A FUSIBLE CARBOSILAZANE RESIN, SHAPING SAID CARBOSILAZE RESIN INTO PREDETERMINED FORM, AND HEATING SAID SHAPED FROM OF CARBOSILAZANE RESIN TO ABOUT 800* TO 2,000*C IN AN INERT ATMOSPHERE, THEREBY TO CONVERT THE CARBOSILAZANE TO SILICON CARBIDE AND SILICON NITRIDE.
Claim 3
Dependent Claim
23 words
The process according to claim 1, wherein the silazane is produced by reaction of a chlorosilane with an amine, amide, hydrazine or hydrazide.
Claim 4
Dependent Claim
62 words
The process according to claim 2, wherein the chlorosilane is at least one member selected from the group consisting of silicon tetrachloride, silicochloroform, methyltrichlorosilane, dimethyldichlorosilane, methyldichlorosilane, dimethylchlorosilane, trimethylchlorosilane, vinyl trichlorosilane, ethyltrichlorosilane, diethyldichlorosilane and phenyldichlorosilane, and the amine, amide, hydrazine or hydrazide is at least one member selected from the group consisting of ammonia, hydrazine, methylamine, dimethylamine, ethylamine, ethylenediamine, cyanamide, thiourea, and guanidine.
Claim 5
Dependent Claim
33 words
The process according to claim 1, wherein the shaped carbosilazane resin prior to heating to 880* to 2,000*C is rendered infusible by at least one of heat treatment, oxidation, sulfidation, hydration and hydrolysis.
Claim 6
Dependent Claim
31 words
The process according to claim 1, wherein the shaping of the carbosilazane resin is effected by dry or melt spinning a solution or melt of the carbosilazane to produce carbosilazane fibers.
Claim 7
Dependent Claim
41 words
The process according to claim 5, wherein the solution or melt of carbosilazane to be spun into fibers has incorporated therein about 0.01 to 2 percent by weight of a linear organic polymer having a degree of polymerization above about 10,000.
Claim 8
Dependent Claim
30 words
The process according to claim 6, wherein the linear organic polymer is at least one member selected from the group consisting of polyethylene oxide, polystyrene, polyisobutylene, polymethyl methacrylate and polyisoprene.
Claim 9
Dependent Claim
52 words
The process according to claim 1, wherein to the fusible carbosilazane prior to shaping there is added at least one heat resistant material selected from the group consisting of carbides, nitrides, borides, oxides, metals and carbon in an amount ranging From about 5 to 95 percent by weight of the carbosilazane-containing mass.
Claim 10
Dependent Claim
26 words
A fiber produced by the process of claim 1 comprising a homogeneous mixture of silicon carbide and silicon nitride having the approximate composition by weight percent:
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) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |