Claims
- 1. A process for preparing a polycrystalline silicon carbide fiber comprising:spinning a pre-ceramic polymer to form a green fiber; curing the green fiber to a cured fiber, and, carrying out pyrolysis on the cured fiber in an environment comprising boron oxide vapor at a temperature sufficient to convert the cured fiber to a polycrystalline silicon carbide fiber, wherein the boron oxide vapor is produced by a reaction of a boron compound selected from the group consisting essentially of: boron carbide, boron, and B6O, with an oxidizing agent in-situ, during the pyrolysis.
Parent Case Info
This application is a divisional of U.S. patent application Ser. No. 09/140,824 filed Aug. 26, 1998, now U.S. Pat. No. 6,129,887.
Government Interests
This invention was made with United States Government support under NASA-EPM Contract F-731-704. The United States Government has certain rights in the invention.
US Referenced Citations (6)
Number |
Name |
Date |
Kind |
5071600 |
Deleeuw et al. |
Dec 1991 |
|
5268336 |
Deleeuw et al. |
Dec 1993 |
|
5279780 |
Lipowitz et al. |
Jan 1994 |
|
5366943 |
Lipowitz et al. |
Nov 1994 |
|
5707568 |
Deleeuw et al. |
Jan 1998 |
|
5928978 |
Barnard et al. |
Jul 1999 |
|
Foreign Referenced Citations (1)
Number |
Date |
Country |
WO 94-02430 |
Feb 1994 |
WO |
Non-Patent Literature Citations (2)
Entry |
Sidgwick, N. V.; “The Chemical Elements and Their Compounds”,. |
Wiley & Sons; “Encyclopedia of Chemical Technology”, vol. 4, Third Ed. |