US4097294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of ceramics
Assignee: United States Department of the Navy
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Filing: 1976-08-23
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Granted: 1978-06-27
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Expires: 1996-08-23
Abstract
Abstract A method for preparing ceramic material from a polymer which comprises selecting a polymer from the class consisting of poly(diorganosilanes), poly(haloorganosilanes), poly(carbosilanes), polysilazanes, polycarbocarboranes, and polyborazines; heating said polymer to a temperature from 700 DEG to 2000 DEG C at a rate of at most 100 DEG C/hr. in an inert atmosphere for at least one hour; and cooling to room temperature at a cooling rate which avoids thermal stresses.
Inventors
- 👤 Roy W. Rice
- 👤 Kenneth J. Wynne
- 👤 William B. Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:36
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/584; C04B35/589; C04B35/56; C04B35/563; C04B35/565; C04B35/571; C04B35/583; C08; C08G; C08G77/00; C08G77/04; C08G77/38; Y; Y10; Y10S; Y10S65/00; Y10S65/901
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
115 words
A method for preparing a ceramic which comprises: heating a polymer of the general formula: C 2 B 10 H 10 R 2 Si(R 2 SiO) n ! x wherein R is selected from the class consisting of alkane, alkene, alkyne, aryl, alkylaryl groups having from 1 to 10 carbon atoms and halogenated derivatives thereof, n is an integer from 1 to 10, and x is greater than 4, to a temperature from 700° to 2000° C with a heating rate not exceeding 100° C/hr. in an inert atmosphere; maintaining said polymer at said temperature for at least 1 hour; whereby said polymer converts to a ceramic, and cooling said resulting ceramic to room temperature.
Claim 2
Independent Claim
115 words
A method for preparing a ceramic which comprises: heating a polymer of the general formula: C 2 B 10 H 10 R 2 Si(R 2 SiO) n ! x wherein R is selected from the class consisting of alkane, alkene, alkyne, aryl, alkylaryl groups having from 1 to 10 carbon atoms and halogenated derivatives thereof, n is an integer from 1 to 10, and x is greater than 4, to a temperature from 700° to 2000° C with a heating rate not exceeding 100° C/hr. in an inert atmosphere; maintaining said polymer at said temperature for at least 1 hour; whereby said polymer converts to a ceramic, and cooling said resulting ceramic to room temperature.
Claim 3
Dependent Claim
18 words
The method of claim 1 wherein R is selected from the group consisting of alkane or aryl groups.
Claim 4
Dependent Claim
9 words
The method of claim 2 wherein x is 50.
Claim 5
Dependent Claim
28 words
The method of claim 2 wherein said polymer is C 2 B 10 H 10 Si(CH 3 ) 2 ((CH 3 ) 2 SiO) n ! x .
Claim 6
Dependent Claim
34 words
The method of claim 4 wherein said polymer is C 2 B 10 H 10 Si(CH 3 ) 2 ((CH 3 ) 2 SiO) 2 ! x with a molecular weight of approximately 8000.
Claim 7
Dependent Claim
15 words
The method of claim 1 wherein said heating rate is from 5° to 40° C/hr.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-06-26 | 1981-12-26 | 1982-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-26 | 1985-12-26 | 1986-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-26 | 1989-12-26 | 1990-06-27 | $7700.00 | Window Closed / Lapsed |