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US5041337A
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Preceramic compositions and ceramic products
Assignee: Albemarle Corp
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Filing: 1990-01-17
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Granted: 1991-08-20
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Expires: 2010-01-17
Abstract
Abstract Preceramic polymer dispersions which have particular utility in providing protective ceramic coatings having low moisture sensitivity on carbon/carbon composites, graphite, carbon fibers, and other normally oxidizable materials are prepared by dispersing about 0-3 parts by weight of aluminum-silicon eutectic, about 0-4 parts by weight of silicon carbide, about 1.5-5 parts by weight of silicon boride, and about 0.4-5 parts by weight of silicon metal in a solution or dispesion obtained by dispersing about 0.1-1.0 parts by weight of a Group IIA metal salt in an organoborosilazane polymer obtained by reacting about 0.25-20 parts by weight of a trialkoxy-, triaryloxy-, or tri(arylalkoxy)boroxine with one part by weight of a polysilazane in an organic solvent and, if desired, heating the dispersion to convert it to a solution.
Inventors
- 👤 Leonard M. Niebylski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:23
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/80; C04B41/81; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B35/589; C04B41/45; C04B41/4505; C04B41/455; C04B41/4554; C08; C08G; C08G79/00; C08K; C08K3/00; C08K3/10; C08K3/105; C08K5/00; C08K5/04; C08K5/09; C08K5/098; C08L; C08L83/00; C08L83/16; C23; C23C; C23C18/00; C23C18/02; C23C18/12; C23C18/1204; C23C18/1208; C23C18/122
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
101 words
A dispersion of a homogenized mixture of about 0-3 parts by weight of aluminum-silicon eutectic, about 0-4 parts by weight of silicon carbide, about 1.5-5 parts by weight of silicon boride, and about 0.4-5 parts by weight of silicon metal in a solution or dispersion obtained by dispersing about 0.1-1.0 part by weight of a Group IIA metal salt in an organoborosilazane polymer solution obtained by reacting about 0.25-20 parts by weight of a trialkoxy-, triaryloxy-, or tri(arylalkoxy)boroxine with one part by weight of a polysilazane in an organic solvent and optionally heating the dispersion to convert it to a solution.
Claim 2
Dependent Claim
101 words
A dispersion of a homogenized mixture of about 0-3 parts by weight of aluminum-silicon eutectic, about 0-4 parts by weight of silicon carbide, about 1.5-5 parts by weight of silicon boride, and about 0.4-5 parts by weight of silicon metal in a solution or dispersion obtained by dispersing about 0.1-1.0 part by weight of a Group IIA metal salt in an organoborosilazane polymer solution obtained by reacting about 0.25-20 parts by weight of a trialkoxy-, triaryloxy-, or tri(arylalkoxy)boroxine with one part by weight of a polysilazane in an organic solvent and optionally heating the dispersion to convert it to a solution.
Claim 3
Dependent Claim
12 words
The dispersion of claim 1 wherein the silicon carbide is α-silicon carbide.
Claim 4
Dependent Claim
12 words
The dispersion of claim 1 wherein the silicon boride is silicon tetraboride.
Claim 5
Dependent Claim
12 words
The dispersion of claim 1 wherein the silicon boride is silicon hexaboride.
Claim 6
Dependent Claim
11 words
The dispersion of claim 1 wherein the silicon metal is amorphous.
Claim 7
Dependent Claim
16 words
The dispersion of claim 1 wherein the salt is a fluoride, tetrafluoroborate, oxide, oxyfluoride, or oxynitride.
Claim 8
Dependent Claim
11 words
The dispersion of claim 6 wherein the salt is barium fluoride.
Claim 9
Dependent Claim
10 words
The dispersion of claim 1 wherein the boroxine is trimethoxyboroxine.
Claim 10
Dependent Claim
51 words
The dispersion of claim 1 wherein the polysilazane is a polymer prepared by reacting an organodihalosilane with ammonia, treating the ammonolysis product with a basic catalyst which is capable of deprotonating an NH group that is adjacent to an SiH group, and quenching the resultant product with an electrophilic quenching reagent.
Claim 11
Dependent Claim
17 words
The dispersion of claim 9 wherein the organodihalosilane is methyldichlorosilane and the basic catalyst is potassium hydride.
Claim 12
Dependent Claim
23 words
An article which comprises a substrate that is normally susceptible to oxidative deterioration and a coating derived from the dispersion of claim 1.
Claim 13
Dependent Claim
9 words
A ceramic derived from the dispersion of claim 1.
References Cited (Backward Citations)
US4550151A
Cited
US4921925A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-08-19 | 1995-02-18 | 1995-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-19 | 1999-02-18 | 1999-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-19 | 2003-02-18 | 2003-08-20 | $7700.00 | Window Closed / Lapsed |