US4543344A
Expired / Lapsed
US
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Silicon nitride-containing ceramic material prepared by pyrolysis of hydrosilazane polymers from (R3 Si)2 NH and HSiCl3
Assignee: COI Ceramics Inc
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Filing: 1985-01-07
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Granted: 1985-09-24
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Expires: 2005-01-07
Abstract
Abstract A process is disclosed for preparing R 3 SiNH-containing hydrosilazane polymer by contacting and reacting trichlorosilane with a disilazane (R 3 Si) 2 NH where R is vinyl, hydrogen, phenyl, or alkyl radicals containing 1 to 3 carbon atoms. These hydrosilazane polymers are useful, when fired at high temperatures, in the formation of silicon nitride and silicon nitride-containing ceramic materials.
Inventors
- 👤 John P. Cannady
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:09
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B35/589; C08; C08G; C08G77/00; C08G77/60; C08G77/62
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
126 words
A method of preparing a silicon nitride-containing ceramic material which method consists of heating a R 3 SiNH-containing hydrosilazane polymer in an inert atmosphere or in a vacuum to a temperature of at least 750° C. until said R 3 SiNH-containing hydrosilazane polymer is converted to a silicon nitride-containing ceramic material, said R 3 SiNH-containing hydrosilazane polymer having been obtained by a process which consisted of contacting and reacting, in an inert, essentially anhydrous atmosphere, trichlorosilane with a disilazane at a temperature in the range of 25° to 300° C. while distilling by-produced volatile products, wherein said disilazane had the general formula (R.sub.3 Si).sub.2 NH where R is selected from the group consisting of vinyl, hydrogen, phenyl, and alkyl radicals containing 1 to 3 carbon atoms.
Claim 2
Independent Claim
126 words
A method of preparing a silicon nitride-containing ceramic material which method consists of heating a R 3 SiNH-containing hydrosilazane polymer in an inert atmosphere or in a vacuum to a temperature of at least 750° C. until said R 3 SiNH-containing hydrosilazane polymer is converted to a silicon nitride-containing ceramic material, said R 3 SiNH-containing hydrosilazane polymer having been obtained by a process which consisted of contacting and reacting, in an inert, essentially anhydrous atmosphere, trichlorosilane with a disilazane at a temperature in the range of 25° to 300° C. while distilling by-produced volatile products, wherein said disilazane had the general formula (R.sub.3 Si).sub.2 NH where R is selected from the group consisting of vinyl, hydrogen, phenyl, and alkyl radicals containing 1 to 3 carbon atoms.
Claim 3
Dependent Claim
31 words
A method as defined in claim 1 wherein said trichlorosilane was purified prior to contacting and reacting with said disilazane at a temperature in the range of 125° to 175° C.
Claim 4
Dependent Claim
34 words
A method as defined in claim 1 wherein said trichlorosilane and said disilazane were contacted in such a manner that the initial reaction temperature resulting from the initial exotherm was less than 50° C.
Claim 5
Dependent Claim
34 words
A method as defined in claim 2 wherein said trichlorosilane and said disilazane were contacted in such a manner that the initial reaction temperature resulting from the initial exotherm was less than 50° C.
Claim 6
Dependent Claim
22 words
A method as defined in claim 3 wherein the initial reaction temperature resulting from the initial exotherm was less than 35° C.
Claim 7
Dependent Claim
22 words
A method as defined in claim 4 wherein the initial reaction temperature resulting from the initial exotherm was less than 35° C.
Claim 8
Dependent Claim
21 words
A method as defined in claim 1 wherein (R 3 Si) 2 NH was [(CH 3 ) 3 Si] 2 NH.
Claim 9
Dependent Claim
23 words
A method as defined in claim 1 wherein (R 3 Si) 2 NH was [(CH 3 ) 2 CH 2 ═CHSi] 2 NH.
Claim 10
Dependent Claim
25 words
A method as defined in claim 1 wherein (R 3 Si) 2 NH was [CH 3 (C 6 H 5 ) 2 Si] 2 NH.
Claim 11
Dependent Claim
25 words
A method as defined in claim 1 wherein (R 3 Si) 2 NH was [C 6 H 5 (CH 3 ) 2 Si] 2 NH.
Claim 12
Dependent Claim
21 words
A method as defined in claim 1 wherein (R 3 Si) 2 NH was [H(CH 3 ) 2 Si] 2 NH.
Claim 13
Dependent Claim
21 words
A method as defined in claim 2 wherein (R 3 Si) 2 NH was [(CH 3 ) 3 Si] 2 NH.
Claim 14
Dependent Claim
23 words
A method as defined in claim 2 wherein (R 3 Si) 2 NH was [(CH 3 ) 2 CH 2 ═CHSi] 2 NH.
Claim 15
Dependent Claim
25 words
A method as defined in claim 2 wherein (R 3 Si) 2 NH was [CH 3 (C 6 H 5 ) 2 Si] 2 NH.
Claim 16
Dependent Claim
25 words
A method as defined in claim 2 wherein (R 3 Si) 2 NH was [C 6 H 5 (CH 3 ) 2 Si] 2 NH.
Claim 17
Dependent Claim
21 words
A method as defined in claim 2 wherein (R 3 Si) 2 NH was [H(CH 3 ) 2 Si] 2 NH.
Claim 18
Dependent Claim
21 words
A method as defined in claim 4 wherein (R 3 Si) 2 NH was [(CH 3 ) 3 Si] 2 NH.
Claim 19
Dependent Claim
23 words
A method as defined in claim 4 wherein (R 3 Si) 2 NH was [(CH 3 ) 2 CH 2 ═CHSi] 2 NH.
Claim 20
Dependent Claim
25 words
A method as defined in claim 4 wherein (R 3 Si) 2 NH was [CH 3 (C 6 H 5 ) 2 Si] 2 NH.
Claim 21
Dependent Claim
25 words
A method as defined in claim 4 wherein (R 3 Si) 2 NH was [C 6 H 5 (CH 3 ) 2 Si] 2 NH.
Claim 22
Dependent Claim
21 words
A method as defined in claim 4 wherein (R 3 Si) 2 NH was [H(CH 3 ) 2 Si] 2 NH.
Claim 23
Dependent Claim
13 words
A silicon nitride-containing ceramic material as prepared by the method of claim 1.
Claim 24
Dependent Claim
13 words
A silicon nitride-containing ceramic material as prepared by the method of claim 2.
Claim 25
Dependent Claim
13 words
A silicon nitride-containing ceramic material as prepared by the method of claim 4.
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) | 1988-09-23 | 1989-03-25 | 1989-09-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-09-23 | 1993-03-25 | 1993-09-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-09-23 | 1997-03-25 | 1997-09-24 | $7700.00 | Window Closed / Lapsed |