US4687657A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fabrication of SiC - AlN alloys
Assignee: CNA Holdings LLC
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Filing: 1986-06-09
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Granted: 1987-08-18
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Expires: 2006-06-09
Abstract
Abstract An aluminum nitride ceramic is formed by pyrolyzing a poly-N-alkyliminoalane. A ceramic comprising a solid solution of silicon carbide and aluminum nitride is also formed by mixing a preceramic organosilicon polymer with a polyalkyliminoalane and pyrolyzing the mixed polymers composition to ceramic form.
Inventors
- 👤 Terence J. Clark
- 👤 Robert E. Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 03:16
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/581; C04B35/56; C04B35/565; C04B35/571; C08; C08G; C08G77/00; C08G77/60; C09; C09D; C09D183/00; C09D183/16
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
34 words
A process for forming an aluminum nitride ceramic comprising; pyrolyzing an organoaluminum preceramic polymer containing a backbone comprised of alternating aluminum- and nitrogen-containing groups at a temperature above 1,000° C. in an inert atmosphere.
Claim 2
Dependent Claim
34 words
A process for forming an aluminum nitride ceramic comprising; pyrolyzing an organoaluminum preceramic polymer containing a backbone comprised of alternating aluminum- and nitrogen-containing groups at a temperature above 1,000° C. in an inert atmosphere.
Claim 3
Dependent Claim
30 words
The process of claim 1 wherein said organoaluminum polymer is a poly-N-alkyliminoalane containing repeating units represented by the formula: ##STR5## in which R is an aliphatic, cycloaliphatic or aromatic radical.
Claim 4
Dependent Claim
68 words
The process of claim 1 wherein said organoaluminum compound is a poly-N-alkyliminoalane made up of a plurality of 4 and/or 6 member rings of the formula: ##STR6## wherein R is an aliphatic, cycloaliphatic or aromatic hydrocarbon combined in a tridimensional cage structure having the chemical composition (HAl-NR) N , in which R has the above meaning and n is a whole number lower than or equal to 10.
Claim 5
Dependent Claim
10 words
A ceramic article produced by the process of claim 2.
Claim 6
Dependent Claim
10 words
A ceramic article produced by the process of claim 3.
Claim 7
Dependent Claim
62 words
A process of forming a silicon carbide and aluminum nitride solid solution comprising mixing a preceramic organosilicon polymer capable of being pyrolyzed to silicon carbide and a preceramic organoaluminum polymer capable of being pyrolyzed to aluminum nitride, and pyrolyzing the mixed polymer composition at a temperature about 1,000° C. in an inert atmosphere to convert the respective organometallic polymers to ceramic form.
Claim 8
Dependent Claim
62 words
A process of forming a silicon carbide and aluminum nitride solid solution comprising mixing a preceramic organosilicon polymer capable of being pyrolyzed to silicon carbide and a preceramic organoaluminum polymer capable of being pyrolyzed to aluminum nitride, and pyrolyzing the mixed polymer composition at a temperature about 1,000° C. in an inert atmosphere to convert the respective organometallic polymers to ceramic form.
Claim 9
Dependent Claim
20 words
The process of claim 6 wherein said organosilicon preceramic polymer is selected the group consisting of poly(diorganosilanes), poly(haloorganosilanes) and poly(carbosilanes).
Claim 10
Dependent Claim
18 words
The process of claim 6 wherein said organoaluminum polymer comprises a backbone of repeating aluminum- and nitrogen-containing groups.
Claim 11
Dependent Claim
30 words
The process of claim 8 wherein said organoaluminum polymer is a poly-N-alkyliminoalane containing repeating units represented by the formula: ##STR7## in which R is an aliphatic, cycloaliphatic or aromatic radical.
Claim 12
Dependent Claim
68 words
The process of claim 8 wherein said organoaluminum compound is a poly-N-alkyliminoalane made up of a plurality of 4 and/or 6 member rings of the formula: ##STR8## wherein R is an aliphatic, cycloaliphatic or aromatic hydrocarbon combined in a tridimensional cage structure having the chemical composition (HAl-NR) n , in which R has the above meaning and n is a whole number lower than or equal to 10.
Claim 13
Dependent Claim
29 words
The process of claim 8 wherein said polymer mixture is formed by mixing the respective organometallic polymers in a solvent, mixing the solvated polymers and drying off the solvent.
Claim 14
Dependent Claim
26 words
The process of claim 11 wherein the solvated polymers are spun into fibers comprising a mixture of the organometallic polymers and pyrolyzed to form ceramic fibers.
Claim 15
Dependent Claim
10 words
A ceramic article formed by the process of claim 9.
Claim 16
Dependent Claim
10 words
A ceramic article formed by the process of claim 10.
Claim 17
Dependent Claim
10 words
A ceramic fiber formed by the process of claim 12.
Claim 18
Dependent Claim
23 words
A preceramic composition comprising a mixture of a preceramic organosilicon polymer and a preceramic organoaluminum polymer capable of being pyrolyzed to aluminum nitride.
Claim 19
Dependent Claim
23 words
A preceramic composition comprising a mixture of a preceramic organosilicon polymer and a preceramic organoaluminum polymer capable of being pyrolyzed to aluminum nitride.
Claim 20
Dependent Claim
10 words
A preceramic article shaped from the composition of claim 16.
Claim 21
Dependent Claim
20 words
The preceramic article of claim 17 wherein said composition is shaped by spinning said preceramic composition into a preceramic fiber.
References Cited (Backward Citations)
US2744074A
Cited
US3505246A
Cited
US3649310A
Cited
US3875133A
Cited
US4010233A
Cited
US4022809A
Cited
US4032553A
Cited
US4064153A
Cited
US4128567A
Cited
US4105455A
Cited
US4097294A
Cited
US4172108A
Cited
US4248814A
Cited
US4284932A
Cited
US4298559A
Cited
US4310481A
Cited
US4414403A
Cited
US4569922A
Cited
US4533712A
Cited
US4514555A
Cited
JPS6027653A
Cited
US4533645A
Cited
US4546163A
Cited
US4581468A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-08-17 | 1991-02-16 | 1991-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-08-17 | 1995-02-16 | 1995-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-08-17 | 1999-02-16 | 1999-08-18 | $7700.00 | Window Closed / Lapsed |